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<button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2309.14041">arXiv:2309.14041</a> <span> [<a href="https://arxiv.org/pdf/2309.14041">pdf</a>, <a href="https://arxiv.org/format/2309.14041">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Beam Charge Asymmetries for Deeply Virtual Compton Scattering on the Proton at CLAS12 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Voutier%2C+E">E. Voutier</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V">V. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Niccolai%2C+S">S. Niccolai</a>, <a href="/search/nucl-ex?searchtype=author&query=Paremuzyan%2C+R">R. Paremuzyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Afanasev%2C+A">A. Afanasev</a>, <a href="/search/nucl-ex?searchtype=author&query=Alvarado-Galeano%2C+J+-">J. -S. Alvarado-Galeano</a>, <a href="/search/nucl-ex?searchtype=author&query=Atoui%2C+M">M. Atoui</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bernauer%2C+J">J. Bernauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianconi%2C+A">A. Bianconi</a>, <a href="/search/nucl-ex?searchtype=author&query=Bondi%2C+M">M. Bondi</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W">W. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Camsonne%2C+A">A. Camsonne</a>, <a href="/search/nucl-ex?searchtype=author&query=Capobianco%2C+R">R. Capobianco</a>, <a href="/search/nucl-ex?searchtype=author&query=Celentano%2C+A">A. Celentano</a>, <a href="/search/nucl-ex?searchtype=author&query=Chatagnon%2C+P">P. Chatagnon</a>, <a href="/search/nucl-ex?searchtype=author&query=Chetry%2C+T">T. Chetry</a>, <a href="/search/nucl-ex?searchtype=author&query=Ciullo%2C+G">G. Ciullo</a>, <a href="/search/nucl-ex?searchtype=author&query=Cole%2C+P">P. Cole</a>, <a href="/search/nucl-ex?searchtype=author&query=Contalbrigo%2C+M">M. Contalbrigo</a>, <a href="/search/nucl-ex?searchtype=author&query=Costantini%2C+G">G. Costantini</a>, <a href="/search/nucl-ex?searchtype=author&query=Defurne%2C+M">M. Defurne</a>, <a href="/search/nucl-ex?searchtype=author&query=Deur%2C+A">A. Deur</a>, <a href="/search/nucl-ex?searchtype=author&query=De+Vita%2C+R">R. De Vita</a> , et al. (54 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2309.14041v2-abstract-short" style="display: inline;"> The parameterization of the nucleon structure through Generalized Parton Distributions (GPDs) shed a new light on the nucleon internal dynamics. For its direct interpretation, Deeply Virtual Compton Scattering (DVCS) is the golden channel for GPDs investigation. The DVCS process interferes with the Bethe-Heitler (BH) mechanism to constitute the leading order amplitude of the $eN \to eN纬$ process.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.14041v2-abstract-full').style.display = 'inline'; document.getElementById('2309.14041v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2309.14041v2-abstract-full" style="display: none;"> The parameterization of the nucleon structure through Generalized Parton Distributions (GPDs) shed a new light on the nucleon internal dynamics. For its direct interpretation, Deeply Virtual Compton Scattering (DVCS) is the golden channel for GPDs investigation. The DVCS process interferes with the Bethe-Heitler (BH) mechanism to constitute the leading order amplitude of the $eN \to eN纬$ process. The study of the $ep纬$ reaction with polarized positron and electron beams gives a complete set of unique observables to unravel the different contributions to the $ep 纬$ cross section. This separates the different reaction amplitudes, providing a direct access to their real and imaginary parts which procures crucial constraints on the model dependences and associated systematic uncertainties on GPDs extraction. The real part of the BH-DVCS interference amplitude is particularly sensitive to the $D$-term which parameterizes the Gravitational Form Factors of the nucleon. The separation of the imaginary parts of the interference and DVCS amplitudes provides insights on possible higher-twist effects. We propose to measure the unpolarized and polarized Beam Charge Asymmetries (BCAs) of the $\vec{e}^{\pm}p \to e^{\pm}p 纬$ process on an unpolarized hydrogen target with {\tt CLAS12}, using polarized positron and electron beams at 10.6 GeV. The azimuthal and $t$-dependences of the unpolarized and polarized BCAs will be measured over a large $(x_B,Q^2)$ phase space using a 100 day run with a luminosity of 0.66$\times 10^{35}$cm$^{-2}\cdot$s$^{-1}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.14041v2-abstract-full').style.display = 'none'; document.getElementById('2309.14041v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Proposal to the Jefferson Lab Program Advisory Committee (PAC51)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2307.07874">arXiv:2307.07874</a> <span> [<a href="https://arxiv.org/pdf/2307.07874">pdf</a>, <a href="https://arxiv.org/format/2307.07874">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Beam Spin Asymmetry Measurements of Deeply Virtual $蟺^0$ Production with CLAS12 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Kim%2C+A">A. Kim</a>, <a href="/search/nucl-ex?searchtype=author&query=Diehl%2C+S">S. Diehl</a>, <a href="/search/nucl-ex?searchtype=author&query=Joo%2C+K">K. Joo</a>, <a href="/search/nucl-ex?searchtype=author&query=Kubarovsky%2C+V">V. Kubarovsky</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Alvarado%2C+J+S">J. S. Alvarado</a>, <a href="/search/nucl-ex?searchtype=author&query=Armstrong%2C+W+R">Whitney R. Armstrong</a>, <a href="/search/nucl-ex?searchtype=author&query=Atac%2C+H">H. Atac</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Benkel%2C+B">B. Benkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianconi%2C+A">A. Bianconi</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Bondi%2C+M">M. Bondi</a>, <a href="/search/nucl-ex?searchtype=author&query=Boss%C3%B9%2C+F">F. Boss霉</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Brinkmann%2C+K+T">K. T. Brinkmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Bueltmann%2C+S">S. Bueltmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V+D">V. D. Burkert</a> , et al. (132 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2307.07874v1-abstract-short" style="display: inline;"> The new experimental measurements of beam spin asymmetry were performed for the deeply virtual exclusive $蟺^0$ production in a wide kinematic region with the photon virtualities $Q^2$ up to 8 GeV$^2$ and the Bjorken scaling variable $x_B$ in the valence regime. The data were collected by the CEBAF Large Acceptance Spectrometer (CLAS12) at Jefferson Lab with longitudinally polarized 10.6 GeV electr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.07874v1-abstract-full').style.display = 'inline'; document.getElementById('2307.07874v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2307.07874v1-abstract-full" style="display: none;"> The new experimental measurements of beam spin asymmetry were performed for the deeply virtual exclusive $蟺^0$ production in a wide kinematic region with the photon virtualities $Q^2$ up to 8 GeV$^2$ and the Bjorken scaling variable $x_B$ in the valence regime. The data were collected by the CEBAF Large Acceptance Spectrometer (CLAS12) at Jefferson Lab with longitudinally polarized 10.6 GeV electrons scattered on an unpolarized liquid-hydrogen target. Sizable asymmetry values indicate a substantial contribution from transverse virtual photon amplitudes to the polarized structure functions.The interpretation of these measurements in terms of the Generalized Parton Distributions (GPDs) demonstrates their sensitivity to the chiral-odd GPD $\bar E_T$, which contains information on quark transverse spin densities in unpolarized and polarized nucleons and provides access to the proton's transverse anomalous magnetic moment. Additionally, the data were compared to a theoretical model based on a Regge formalism that was extended to the high photon virtualities. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.07874v1-abstract-full').style.display = 'none'; document.getElementById('2307.07874v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 July, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">arXiv admin note: substantial text overlap with arXiv:2210.14557</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2306.09360">arXiv:2306.09360</a> <span> [<a href="https://arxiv.org/pdf/2306.09360">pdf</a>, <a href="https://arxiv.org/format/2306.09360">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> </div> <p class="title is-5 mathjax"> Strong Interaction Physics at the Luminosity Frontier with 22 GeV Electrons at Jefferson Lab </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Accardi%2C+A">A. Accardi</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+D">D. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Afanasev%2C+A">A. Afanasev</a>, <a href="/search/nucl-ex?searchtype=author&query=Akondi%2C+C+S">C. S. Akondi</a>, <a href="/search/nucl-ex?searchtype=author&query=Akopov%2C+N">N. Akopov</a>, <a href="/search/nucl-ex?searchtype=author&query=Albaladejo%2C+M">M. Albaladejo</a>, <a href="/search/nucl-ex?searchtype=author&query=Albataineh%2C+H">H. Albataineh</a>, <a href="/search/nucl-ex?searchtype=author&query=Albrecht%2C+M">M. Albrecht</a>, <a href="/search/nucl-ex?searchtype=author&query=Almeida-Zamora%2C+B">B. Almeida-Zamora</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M">M. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Androi%C4%87%2C+D">D. Androi膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Armstrong%2C+W">W. Armstrong</a>, <a href="/search/nucl-ex?searchtype=author&query=Armstrong%2C+D+S">D. S. Armstrong</a>, <a href="/search/nucl-ex?searchtype=author&query=Arratia%2C+M">M. Arratia</a>, <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Asaturyan%2C+A">A. Asaturyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Austregesilo%2C+A">A. Austregesilo</a>, <a href="/search/nucl-ex?searchtype=author&query=Avagyan%2C+H">H. Avagyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Averett%2C+T">T. Averett</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Bacchetta%2C+A">A. Bacchetta</a>, <a href="/search/nucl-ex?searchtype=author&query=Balantekin%2C+A+B">A. B. Balantekin</a>, <a href="/search/nucl-ex?searchtype=author&query=Baltzell%2C+N">N. Baltzell</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a> , et al. (419 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2306.09360v2-abstract-short" style="display: inline;"> This document presents the initial scientific case for upgrading the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab (JLab) to 22 GeV. It is the result of a community effort, incorporating insights from a series of workshops conducted between March 2022 and April 2023. With a track record of over 25 years in delivering the world's most intense and precise multi-GeV electron… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.09360v2-abstract-full').style.display = 'inline'; document.getElementById('2306.09360v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.09360v2-abstract-full" style="display: none;"> This document presents the initial scientific case for upgrading the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab (JLab) to 22 GeV. It is the result of a community effort, incorporating insights from a series of workshops conducted between March 2022 and April 2023. With a track record of over 25 years in delivering the world's most intense and precise multi-GeV electron beams, CEBAF's potential for a higher energy upgrade presents a unique opportunity for an innovative nuclear physics program, which seamlessly integrates a rich historical background with a promising future. The proposed physics program encompass a diverse range of investigations centered around the nonperturbative dynamics inherent in hadron structure and the exploration of strongly interacting systems. It builds upon the exceptional capabilities of CEBAF in high-luminosity operations, the availability of existing or planned Hall equipment, and recent advancements in accelerator technology. The proposed program cover various scientific topics, including Hadron Spectroscopy, Partonic Structure and Spin, Hadronization and Transverse Momentum, Spatial Structure, Mechanical Properties, Form Factors and Emergent Hadron Mass, Hadron-Quark Transition, and Nuclear Dynamics at Extreme Conditions, as well as QCD Confinement and Fundamental Symmetries. Each topic highlights the key measurements achievable at a 22 GeV CEBAF accelerator. Furthermore, this document outlines the significant physics outcomes and unique aspects of these programs that distinguish them from other existing or planned facilities. In summary, this document provides an exciting rationale for the energy upgrade of CEBAF to 22 GeV, outlining the transformative scientific potential that lies within reach, and the remarkable opportunities it offers for advancing our understanding of hadron physics and related fundamental phenomena. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.09360v2-abstract-full').style.display = 'none'; document.getElementById('2306.09360v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Updates to the list of authors; Preprint number changed from theory to experiment; Updates to sections 4 and 6, including additional figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-23-3840 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.13691">arXiv:2210.13691</a> <span> [<a href="https://arxiv.org/pdf/2210.13691">pdf</a>, <a href="https://arxiv.org/format/2210.13691">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.130.142301">10.1103/PhysRevLett.130.142301 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First Measurement of $螞$ Electroproduction off Nuclei in the Current and Target Fragmentation Regions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Chetry%2C+T">T. Chetry</a>, <a href="/search/nucl-ex?searchtype=author&query=Fassi%2C+L+E">L. El Fassi</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Dupr%C3%A9%2C+R">R. Dupr茅</a>, <a href="/search/nucl-ex?searchtype=author&query=Alaoui%2C+A+E">A. El Alaoui</a>, <a href="/search/nucl-ex?searchtype=author&query=Hafidi%2C+K">K. Hafidi</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Armstrong%2C+W+R">W. R. Armstrong</a>, <a href="/search/nucl-ex?searchtype=author&query=Arratia%2C+M">M. Arratia</a>, <a href="/search/nucl-ex?searchtype=author&query=Atac%2C+H">H. Atac</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Baashen%2C+L">L. Baashen</a>, <a href="/search/nucl-ex?searchtype=author&query=Baltzell%2C+N+A">N. A. Baltzell</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Bashkanov%2C+M">M. Bashkanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Benkel%2C+B">B. Benkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianconi%2C+A">A. Bianconi</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Bondi%2C+M">M. Bondi</a>, <a href="/search/nucl-ex?searchtype=author&query=Booth%2C+W+A">W. A. Booth</a> , et al. (129 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2210.13691v2-abstract-short" style="display: inline;"> We report results of $螞$ hyperon production in semi-inclusive deep-inelastic scattering off deuterium, carbon, iron, and lead targets obtained with the CLAS detector and the Continuous Electron Beam Accelerator Facility 5.014~GeV electron beam. These results represent the first measurements of the $螞$ multiplicity ratio and transverse momentum broadening as a function of the energy fraction~($z$)… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.13691v2-abstract-full').style.display = 'inline'; document.getElementById('2210.13691v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.13691v2-abstract-full" style="display: none;"> We report results of $螞$ hyperon production in semi-inclusive deep-inelastic scattering off deuterium, carbon, iron, and lead targets obtained with the CLAS detector and the Continuous Electron Beam Accelerator Facility 5.014~GeV electron beam. These results represent the first measurements of the $螞$ multiplicity ratio and transverse momentum broadening as a function of the energy fraction~($z$) in the current and target fragmentation regions. The multiplicity ratio exhibits a strong suppression at high~$z$~and~an enhancement at~low~$z$. The measured transverse momentum broadening is an order of magnitude greater than that seen for light mesons. This indicates that the propagating entity interacts very strongly with the nuclear medium, which suggests that propagation of diquark configurations in the nuclear medium takes place at least part of the time, even at high~$z$. The trends of these results are qualitatively described by the Giessen Boltzmann-Uehling-Uhlenbeck transport model, particularly for the multiplicity ratios. These observations will potentially open a new era of studies of the structure of the nucleon as well as of strange baryons. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.13691v2-abstract-full').style.display = 'none'; document.getElementById('2210.13691v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 April, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">14 pages, 6 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2208.05086">arXiv:2208.05086</a> <span> [<a href="https://arxiv.org/pdf/2208.05086">pdf</a>, <a href="https://arxiv.org/format/2208.05086">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.130.022501">10.1103/PhysRevLett.130.022501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First observation of correlations between spin and transverse momenta in back-to-back dihadron production at CLAS12 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Hayward%2C+T+B">T. B. Hayward</a>, <a href="/search/nucl-ex?searchtype=author&query=Kotzinian%2C+A">A. Kotzinian</a>, <a href="/search/nucl-ex?searchtype=author&query=Armstrong%2C+W+R">W. R. Armstrong</a>, <a href="/search/nucl-ex?searchtype=author&query=Atac%2C+H">H. Atac</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Baashen%2C+L">L. Baashen</a>, <a href="/search/nucl-ex?searchtype=author&query=Baltzell%2C+N+A">N. A. Baltzell</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Bashkanov%2C+M">M. Bashkanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianconi%2C+A">A. Bianconi</a>, <a href="/search/nucl-ex?searchtype=author&query=Biondo%2C+L">L. Biondo</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Bondi%2C+M">M. Bondi</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Boss%C3%B9%2C+F">F. Boss霉</a>, <a href="/search/nucl-ex?searchtype=author&query=Brinkman%2C+K+T">K. T. Brinkman</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Bueltmann%2C+S">S. Bueltmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Bulumulla%2C+D">D. Bulumulla</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V+D">V. D. Burkert</a> , et al. (131 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2208.05086v1-abstract-short" style="display: inline;"> We report the first measurements of deep inelastic scattering spin-dependent azimuthal asymmetries in back-to-back dihadron electroproduction, where two hadrons are produced in opposite hemispheres along the z-axis in the center-of-mass frame, with the first hadron produced in the current-fragmentation region and the second in the target-fragmentation region. The data were taken with longitudinall… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.05086v1-abstract-full').style.display = 'inline'; document.getElementById('2208.05086v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2208.05086v1-abstract-full" style="display: none;"> We report the first measurements of deep inelastic scattering spin-dependent azimuthal asymmetries in back-to-back dihadron electroproduction, where two hadrons are produced in opposite hemispheres along the z-axis in the center-of-mass frame, with the first hadron produced in the current-fragmentation region and the second in the target-fragmentation region. The data were taken with longitudinally polarized electron beams of 10.2 and 10.6 GeV incident on an unpolarized liquid-hydrogen target using the CLAS12 spectrometer at Jefferson Lab. Observed non-zero $\sin螖蠁$ modulations in $ep \rightarrow e'p蟺^+X$ events, where $螖蠁$ is the difference of the azimuthal angles of the proton and pion in the virtual photon and target nucleon center-of-mass frame, indicate that correlations between the spin and transverse momenta of hadrons produced in the target- and current-fragmentation regions may be significant. The measured beam-spin asymmetries provide a first access in dihadron production to a previously unobserved leading-twist spin- and transverse-momentum-dependent fracture function. The fracture functions describe the hadronization of the target remnant after the hard scattering of a virtual photon off a quark in the target particle and provide a new avenue for studying nucleonic structure and hadronization. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.05086v1-abstract-full').style.display = 'none'; document.getElementById('2208.05086v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 August, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 6 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2208.05054">arXiv:2208.05054</a> <span> [<a href="https://arxiv.org/pdf/2208.05054">pdf</a>, <a href="https://arxiv.org/format/2208.05054">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2023.168032">10.1016/j.nima.2023.168032 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Alignment of the CLAS12 central hybrid tracker with a Kalman Filter </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Paul%2C+S+J">S. J. Paul</a>, <a href="/search/nucl-ex?searchtype=author&query=Peck%2C+A">A. Peck</a>, <a href="/search/nucl-ex?searchtype=author&query=Arratia%2C+M">M. Arratia</a>, <a href="/search/nucl-ex?searchtype=author&query=Gotra%2C+Y">Y. Gotra</a>, <a href="/search/nucl-ex?searchtype=author&query=Ziegler%2C+V">V. Ziegler</a>, <a href="/search/nucl-ex?searchtype=author&query=De+Vita%2C+R">R. De Vita</a>, <a href="/search/nucl-ex?searchtype=author&query=Bossu%2C+F">F. Bossu</a>, <a href="/search/nucl-ex?searchtype=author&query=Defurne%2C+M">M. Defurne</a>, <a href="/search/nucl-ex?searchtype=author&query=Atac%2C+H">H. Atac</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Baashen%2C+L">L. Baashen</a>, <a href="/search/nucl-ex?searchtype=author&query=Baltzell%2C+N+A">N. A. Baltzell</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Bashkanov%2C+M">M. Bashkanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Benkel%2C+B">B. Benkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianconi%2C+A">A. Bianconi</a>, <a href="/search/nucl-ex?searchtype=author&query=Biondo%2C+L">L. Biondo</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Bondi%2C+M">M. Bondi</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Brinkmann%2C+K+T">K. Th. Brinkmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a> , et al. (109 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2208.05054v1-abstract-short" style="display: inline;"> Several factors can contribute to the difficulty of aligning the sensors of tracking detectors, including a large number of modules, multiple types of detector technologies, and non-linear strip patterns on the sensors. All three of these factors apply to the CLAS12 CVT, which is a hybrid detector consisting of planar silicon sensors with non-parallel strips, and cylindrical micromegas sensors wit… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.05054v1-abstract-full').style.display = 'inline'; document.getElementById('2208.05054v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2208.05054v1-abstract-full" style="display: none;"> Several factors can contribute to the difficulty of aligning the sensors of tracking detectors, including a large number of modules, multiple types of detector technologies, and non-linear strip patterns on the sensors. All three of these factors apply to the CLAS12 CVT, which is a hybrid detector consisting of planar silicon sensors with non-parallel strips, and cylindrical micromegas sensors with longitudinal and arc-shaped strips located within a 5~T superconducting solenoid. To align this detector, we used the Kalman Alignment Algorithm, which accounts for correlations between the alignment parameters without requiring the time-consuming inversion of large matrices. This is the first time that this algorithm has been adapted for use with hybrid technologies, non-parallel strips, and curved sensors. We present the results for the first alignment of the CLAS12 CVT using straight tracks from cosmic rays and from a target with the magnetic field turned off. After running this procedure, we achieved alignment at the level of 10~$渭$m, and the widths of the residual spectra were greatly reduced. These results attest to the flexibility of this algorithm and its applicability to future use in the CLAS12 CVT and other hybrid or curved trackers, such as those proposed for the future Electron-Ion Collider. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.05054v1-abstract-full').style.display = 'none'; document.getElementById('2208.05054v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 August, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Instrum.Meth.A 1049 (2023) 168032 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.06682">arXiv:2207.06682</a> <span> [<a href="https://arxiv.org/pdf/2207.06682">pdf</a>, <a href="https://arxiv.org/format/2207.06682">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.129.182501">10.1103/PhysRevLett.129.182501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Observation of azimuth-dependent suppression of hadron pairs in electron scattering off nuclei </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Paul%2C+S+J">S. J. Paul</a>, <a href="/search/nucl-ex?searchtype=author&query=Moran%2C+S">S. Moran</a>, <a href="/search/nucl-ex?searchtype=author&query=Arratia%2C+M">M. Arratia</a>, <a href="/search/nucl-ex?searchtype=author&query=Alaoui%2C+A+E">A. El Alaoui</a>, <a href="/search/nucl-ex?searchtype=author&query=Hakobyan%2C+H">H. Hakobyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W">W. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M+J">M. J. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Armstrong%2C+W+R">W. R. Armstrong</a>, <a href="/search/nucl-ex?searchtype=author&query=Atac%2C+H">H. Atac</a>, <a href="/search/nucl-ex?searchtype=author&query=Baashen%2C+L">L. Baashen</a>, <a href="/search/nucl-ex?searchtype=author&query=Baltzell%2C+N+A">N. A. Baltzell</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Bashkanov%2C+M">M. Bashkanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Benkel%2C+B">B. Benkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianconi%2C+A">A. Bianconi</a>, <a href="/search/nucl-ex?searchtype=author&query=Biondo%2C+L">L. Biondo</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Bondi%2C+M">M. Bondi</a>, <a href="/search/nucl-ex?searchtype=author&query=Bossu%2C+F">F. Bossu</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Brinkmann%2C+K+T">K. Th. Brinkmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a> , et al. (120 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2207.06682v2-abstract-short" style="display: inline;"> We present the first measurement of di-hadron angular correlations in electron-nucleus scattering. The data were taken with the CLAS detector and a 5.0 GeV electron beam incident on deuterium, carbon, iron, and lead targets. Relative to deuterium, the nuclear yields of charged-pion pairs show a strong suppression for azimuthally opposite pairs, no suppression for azimuthally nearby pairs, and an e… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.06682v2-abstract-full').style.display = 'inline'; document.getElementById('2207.06682v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.06682v2-abstract-full" style="display: none;"> We present the first measurement of di-hadron angular correlations in electron-nucleus scattering. The data were taken with the CLAS detector and a 5.0 GeV electron beam incident on deuterium, carbon, iron, and lead targets. Relative to deuterium, the nuclear yields of charged-pion pairs show a strong suppression for azimuthally opposite pairs, no suppression for azimuthally nearby pairs, and an enhancement of pairs with large invariant mass. These effects grow with increased nuclear size. The data are qualitatively described by the GiBUU model, which suggests that hadrons form near the nuclear surface and undergo multiple-scattering in nuclei. These results show that angular correlation studies can open a new way to elucidate how hadrons form and interact inside nuclei <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.06682v2-abstract-full').style.display = 'none'; document.getElementById('2207.06682v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.Lett. 129 (2022) 18, 182501 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.16785">arXiv:2203.16785</a> <span> [<a href="https://arxiv.org/pdf/2203.16785">pdf</a>, <a href="https://arxiv.org/format/2203.16785">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.107.015201">10.1103/PhysRevC.107.015201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Exclusive $蟺^{-}$ Electroproduction off the Neutron in Deuterium in the Resonance Region </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Tian%2C+Y">Y. Tian</a>, <a href="/search/nucl-ex?searchtype=author&query=Gothe%2C+R+W">R. W. Gothe</a>, <a href="/search/nucl-ex?searchtype=author&query=Mokeev%2C+V+I">V. I. Mokeev</a>, <a href="/search/nucl-ex?searchtype=author&query=Hollis%2C+G">G. Hollis</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M+J">M. J. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Armstrong%2C+W+R">W. R. Armstrong</a>, <a href="/search/nucl-ex?searchtype=author&query=Atac%2C+H">H. Atac</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Benkel%2C+B">B. Benkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianconi%2C+A">A. Bianconi</a>, <a href="/search/nucl-ex?searchtype=author&query=Biondo%2C+L">L. Biondo</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A">A. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Boss%C3%B9%2C+F">F. Boss霉</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bond%C3%AC%2C+M">M. Bond矛</a>, <a href="/search/nucl-ex?searchtype=author&query=Brinkmann%2C+K+T">K. T. Brinkmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Bueltmann%2C+S">S. Bueltmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Bulumulla%2C+D">D. Bulumulla</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V+D">V. D. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Capobianco%2C+R">R. Capobianco</a> , et al. (118 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2203.16785v3-abstract-short" style="display: inline;"> New results for the exclusive and quasi-free cross sections off neutrons bound in deuterium $纬_vn(p) \rightarrow p蟺^{-} (p)$ are presented over a wide final state hadron angle range with a kinematic coverage of the invariant mass ($W$) up to 1.825 GeV and the virtual photon four-momentum transfer squared ($Q^{2}$) from 0.4 to 1.0 GeV$^2$. The exclusive structure functions were extracted and their… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.16785v3-abstract-full').style.display = 'inline'; document.getElementById('2203.16785v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.16785v3-abstract-full" style="display: none;"> New results for the exclusive and quasi-free cross sections off neutrons bound in deuterium $纬_vn(p) \rightarrow p蟺^{-} (p)$ are presented over a wide final state hadron angle range with a kinematic coverage of the invariant mass ($W$) up to 1.825 GeV and the virtual photon four-momentum transfer squared ($Q^{2}$) from 0.4 to 1.0 GeV$^2$. The exclusive structure functions were extracted and their Legendre moments were obtained. Final-state-interaction contributions have been kinematically separated from the extracted quasi-free cross sections off bound neutrons solely based on the analysis of the experimental data. These new results will serve as long-awaited input for phenomenological analyses to extract the $Q^{2}$ evolution of previously unavailable $n \to N^{*}$ electroexcitation amplitudes and to improve state-of-the-art models of neutrino scattering off nuclei by augmenting the already available results from free protons. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.16785v3-abstract-full').style.display = 'none'; document.getElementById('2203.16785v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 31 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">The author list has been updated</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2202.03398">arXiv:2202.03398</a> <span> [<a href="https://arxiv.org/pdf/2202.03398">pdf</a>, <a href="https://arxiv.org/format/2202.03398">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.105.065201">10.1103/PhysRevC.105.065201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Beam-Recoil Transferred Polarization in $K^+Y$ Electroproduction in the Nucleon Resonance Region with CLAS12 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Carman%2C+D+S">D. S. Carman</a>, <a href="/search/nucl-ex?searchtype=author&query=D%27Angelo%2C+A">A. D'Angelo</a>, <a href="/search/nucl-ex?searchtype=author&query=Lanza%2C+L">L. Lanza</a>, <a href="/search/nucl-ex?searchtype=author&query=Mokeev%2C+V+I">V. I. Mokeev</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M+J">M. J. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Armstrong%2C+W+R">W. R. Armstrong</a>, <a href="/search/nucl-ex?searchtype=author&query=Atac%2C+H">H. Atac</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Baltzell%2C+N+A">N. A. Baltzell</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Benkel%2C+B">B. Benkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianconi%2C+A">A. Bianconi</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Bondi%2C+M">M. Bondi</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bossu%2C+F">F. Bossu</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Bueltmann%2C+S">S. Bueltmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Bulumulla%2C+D">D. Bulumulla</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V+D">V. D. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Capobianco%2C+R">R. Capobianco</a> , et al. (116 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2202.03398v1-abstract-short" style="display: inline;"> Beam-recoil transferred polarizations for the exclusive electroproduction of $K^+螞$ and $K^+危^0$ final states from an unpolarized proton target have been measured using the CLAS12 spectrometer at Jefferson Laboratory. The measurements at beam energies of 6.535~GeV and 7.546~GeV span the range of four-momentum transfer $Q^2$ from 0.3 to 4.5~GeV$^2$ and invariant energy $W$ from 1.6 to 2.4~GeV, whil… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2202.03398v1-abstract-full').style.display = 'inline'; document.getElementById('2202.03398v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2202.03398v1-abstract-full" style="display: none;"> Beam-recoil transferred polarizations for the exclusive electroproduction of $K^+螞$ and $K^+危^0$ final states from an unpolarized proton target have been measured using the CLAS12 spectrometer at Jefferson Laboratory. The measurements at beam energies of 6.535~GeV and 7.546~GeV span the range of four-momentum transfer $Q^2$ from 0.3 to 4.5~GeV$^2$ and invariant energy $W$ from 1.6 to 2.4~GeV, while covering the full center-of-mass angular range of the $K^+$. These new data extend the existing hyperon polarization data from CLAS in a similar kinematic range but from a significantly larger dataset. They represent an important addition to the world data, allowing for better exploration of the reaction mechanism in strangeness production processes, for further understanding of the spectrum and structure of excited nucleon states, and for improved insight into the strong interaction in the regime of non-perturbative dynamics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2202.03398v1-abstract-full').style.display = 'none'; document.getElementById('2202.03398v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">25 pages, 22 figures, 4 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-22-3560 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2201.03714">arXiv:2201.03714</a> <span> [<a href="https://arxiv.org/pdf/2201.03714">pdf</a>, <a href="https://arxiv.org/format/2201.03714">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.128.252002">10.1103/PhysRevLett.128.252002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Deeply virtual Compton scattering cross section at high Bjorken $x_B$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Georges%2C+F">F. Georges</a>, <a href="/search/nucl-ex?searchtype=author&query=Rashad%2C+M+N+H">M. N. H. Rashad</a>, <a href="/search/nucl-ex?searchtype=author&query=Stefanko%2C+A">A. Stefanko</a>, <a href="/search/nucl-ex?searchtype=author&query=Dlamini%2C+M">M. Dlamini</a>, <a href="/search/nucl-ex?searchtype=author&query=Karki%2C+B">B. Karki</a>, <a href="/search/nucl-ex?searchtype=author&query=Ali%2C+S+F">S. F. Ali</a>, <a href="/search/nucl-ex?searchtype=author&query=Lin%2C+P">P-J. Lin</a>, <a href="/search/nucl-ex?searchtype=author&query=Ko%2C+H">H-S Ko</a>, <a href="/search/nucl-ex?searchtype=author&query=Israel%2C+N">N. Israel</a>, <a href="/search/nucl-ex?searchtype=author&query=Adikaram%2C+D">D. Adikaram</a>, <a href="/search/nucl-ex?searchtype=author&query=Ahmed%2C+Z">Z. Ahmed</a>, <a href="/search/nucl-ex?searchtype=author&query=Albataineh%2C+H">H. Albataineh</a>, <a href="/search/nucl-ex?searchtype=author&query=Aljawrneh%2C+B">B. Aljawrneh</a>, <a href="/search/nucl-ex?searchtype=author&query=Allada%2C+K">K. Allada</a>, <a href="/search/nucl-ex?searchtype=author&query=Allison%2C+S">S. Allison</a>, <a href="/search/nucl-ex?searchtype=author&query=Alsalmi%2C+S">S. Alsalmi</a>, <a href="/search/nucl-ex?searchtype=author&query=Androic%2C+D">D. Androic</a>, <a href="/search/nucl-ex?searchtype=author&query=Aniol%2C+K">K. Aniol</a>, <a href="/search/nucl-ex?searchtype=author&query=Annand%2C+J">J. Annand</a>, <a href="/search/nucl-ex?searchtype=author&query=Atac%2C+H">H. Atac</a>, <a href="/search/nucl-ex?searchtype=author&query=Averett%2C+T">T. Averett</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Bai%2C+X">X. Bai</a>, <a href="/search/nucl-ex?searchtype=author&query=Bane%2C+J">J. Bane</a>, <a href="/search/nucl-ex?searchtype=author&query=Barcus%2C+S">S. Barcus</a> , et al. (137 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2201.03714v1-abstract-short" style="display: inline;"> We report high-precision measurements of the Deeply Virtual Compton Scattering (DVCS) cross section at high values of the Bjorken variable $x_B$. DVCS is sensitive to the Generalized Parton Distributions of the nucleon, which provide a three-dimensional description of its internal constituents. Using the exact analytic expression of the DVCS cross section for all possible polarization states of th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.03714v1-abstract-full').style.display = 'inline'; document.getElementById('2201.03714v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2201.03714v1-abstract-full" style="display: none;"> We report high-precision measurements of the Deeply Virtual Compton Scattering (DVCS) cross section at high values of the Bjorken variable $x_B$. DVCS is sensitive to the Generalized Parton Distributions of the nucleon, which provide a three-dimensional description of its internal constituents. Using the exact analytic expression of the DVCS cross section for all possible polarization states of the initial and final electron and nucleon, and final state photon, we present the first experimental extraction of all four helicity-conserving Compton Form Factors (CFFs) of the nucleon as a function of $x_B$, while systematically including helicity flip amplitudes. In particular, the high accuracy of the present data demonstrates sensitivity to some very poorly known CFFs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.03714v1-abstract-full').style.display = 'none'; document.getElementById('2201.03714v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2109.09951">arXiv:2109.09951</a> <span> [<a href="https://arxiv.org/pdf/2109.09951">pdf</a>, <a href="https://arxiv.org/format/2109.09951">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.105.015201">10.1103/PhysRevC.105.015201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of charged-pion production in deep-inelastic scattering off nuclei with the CLAS detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Moran%2C+S">S. Moran</a>, <a href="/search/nucl-ex?searchtype=author&query=Dupre%2C+R">R. Dupre</a>, <a href="/search/nucl-ex?searchtype=author&query=Hakobyan%2C+H">H. Hakobyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Arratia%2C+M">M. Arratia</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Borquez%2C+A">A. Borquez</a>, <a href="/search/nucl-ex?searchtype=author&query=Alaoui%2C+A+E">A. El Alaoui</a>, <a href="/search/nucl-ex?searchtype=author&query=Fassi%2C+L+E">L. El Fassi</a>, <a href="/search/nucl-ex?searchtype=author&query=Hafidi%2C+K">K. Hafidi</a>, <a href="/search/nucl-ex?searchtype=author&query=Mendez%2C+R">R. Mendez</a>, <a href="/search/nucl-ex?searchtype=author&query=Mineeva%2C+T">T. Mineeva</a>, <a href="/search/nucl-ex?searchtype=author&query=Paul%2C+S+J">S. J. Paul</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M+J">M. J. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Angelini%2C+G">Giovanni Angelini</a>, <a href="/search/nucl-ex?searchtype=author&query=Armstrong%2C+W+R">Whitney R. Armstrong</a>, <a href="/search/nucl-ex?searchtype=author&query=Atac%2C+H">H. Atac</a>, <a href="/search/nucl-ex?searchtype=author&query=Baltzell%2C+N+A">N. A. Baltzell</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Bashkanov%2C+M">M. Bashkanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">Fatiha Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianconi%2C+A">A. Bianconi</a>, <a href="/search/nucl-ex?searchtype=author&query=Biondo%2C+L">L. Biondo</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a> , et al. (119 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2109.09951v2-abstract-short" style="display: inline;"> Background: Energetic quarks in nuclear DIS propagate through the nuclear medium. Processes that are believed to occur inside nuclei include quark energy loss through medium-stimulated gluon bremsstrahlung and intra-nuclear interactions of forming hadrons. More data are required to gain a more complete understanding of these effects. Purpose: To test the theoretical models of parton transport and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.09951v2-abstract-full').style.display = 'inline'; document.getElementById('2109.09951v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2109.09951v2-abstract-full" style="display: none;"> Background: Energetic quarks in nuclear DIS propagate through the nuclear medium. Processes that are believed to occur inside nuclei include quark energy loss through medium-stimulated gluon bremsstrahlung and intra-nuclear interactions of forming hadrons. More data are required to gain a more complete understanding of these effects. Purpose: To test the theoretical models of parton transport and hadron formation, we compared their predictions for the nuclear and kinematic dependence of pion production in nuclei. Methods: We have measured charged-pion production in semi-inclusive DIS off D, C, Fe, and Pb using the CLAS detector and the CEBAF 5.014 GeV electron beam. We report results on the nuclear-to-deuterium multiplicity ratio for $蟺^{+}$ and $蟺^{-}$ as a function of energy transfer, four-momentum transfer, and pion energy fraction or transverse momentum - the first three-dimensional study of its kind. Results: The $蟺^{+}$ multiplicity ratio is found to depend strongly on the pion fractional energy $z$, and reaches minimum values of $0.67\pm0.03$, $0.43\pm0.02$, and $0.27\pm0.01$ for the C, Fe, and Pb targets, respectively. The $z$ dependences of the multiplicity ratios for $蟺^{+}$ and $蟺^{-}$ are equal within uncertainties for C and Fe targets but show differences at the level of 10$\%$ for the Pb-target data. The results are qualitatively described by the GiBUU transport model, as well as with a model based on hadron absorption, but are in tension with calculations based on nuclear fragmentation functions. Conclusions: These precise results will strongly constrain the kinematic and flavor dependence of nuclear effects in hadron production, probing an unexplored kinematic region. They will help to reveal how the nucleus reacts to a fast quark, thereby shedding light on its color structure, transport properties, and on the mechanisms of the hadronization process. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.09951v2-abstract-full').style.display = 'none'; document.getElementById('2109.09951v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 September, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">22 pages, 5 figures, 12 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 105, 015201, (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2108.03134">arXiv:2108.03134</a> <span> [<a href="https://arxiv.org/pdf/2108.03134">pdf</a>, <a href="https://arxiv.org/format/2108.03134">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Improved $螞p$ Elastic Scattering Cross Sections Between 0.9 and 2.0 GeV/c and Connections to the Neutron Star Equation of State </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=CLAS+Collaboration"> CLAS Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Rowley%2C+J">J. Rowley</a>, <a href="/search/nucl-ex?searchtype=author&query=Compton%2C+N">N. Compton</a>, <a href="/search/nucl-ex?searchtype=author&query=Djalali%2C+C">C. Djalali</a>, <a href="/search/nucl-ex?searchtype=author&query=Hicks%2C+K">K. Hicks</a>, <a href="/search/nucl-ex?searchtype=author&query=Price%2C+J">J. Price</a>, <a href="/search/nucl-ex?searchtype=author&query=Zachariou%2C+N">N. Zachariou</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Armstrong%2C+W+R">W. R. Armstrong</a>, <a href="/search/nucl-ex?searchtype=author&query=Atac%2C+H">H. Atac</a>, <a href="/search/nucl-ex?searchtype=author&query=Baashen%2C+L">L. Baashen</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Bashkanov%2C+M">M. Bashkanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianconi%2C+A">A. Bianconi</a>, <a href="/search/nucl-ex?searchtype=author&query=Biondo%2C+L">L. Biondo</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Bondi%2C+M">M. Bondi</a>, <a href="/search/nucl-ex?searchtype=author&query=Bossu%2C+F">F. Bossu</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Bulumulla%2C+D">D. Bulumulla</a> , et al. (121 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2108.03134v1-abstract-short" style="display: inline;"> Strange matter is believed to exist in the cores of neutron stars based on simple kinematics. If this is true, then hyperon-nucleon interactions will play a significant part in the neutron star equation of state (EOS). Yet, compared to other elastic scattering processes, there is very little data on $螞$-$N$ scattering. This experiment utilized the CLAS detector to study the $螞p \rightarrow 螞p$ ela… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.03134v1-abstract-full').style.display = 'inline'; document.getElementById('2108.03134v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2108.03134v1-abstract-full" style="display: none;"> Strange matter is believed to exist in the cores of neutron stars based on simple kinematics. If this is true, then hyperon-nucleon interactions will play a significant part in the neutron star equation of state (EOS). Yet, compared to other elastic scattering processes, there is very little data on $螞$-$N$ scattering. This experiment utilized the CLAS detector to study the $螞p \rightarrow 螞p$ elastic scattering cross section in the incident $螞$ momentum range 0.9-2.0 GeV/c. This is the first data on this reaction in several decades. The new cross sections have significantly better accuracy and precision than the existing world data, and the techniques developed here can also be used in future experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.03134v1-abstract-full').style.display = 'none'; document.getElementById('2108.03134v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 August, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 5 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2103.12651">arXiv:2103.12651</a> <span> [<a href="https://arxiv.org/pdf/2103.12651">pdf</a>, <a href="https://arxiv.org/format/2103.12651">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epja/s10050-021-00474-z">10.1140/epja/s10050-021-00474-z <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Beam charge asymmetries for deeply virtual Compton scattering off the proton </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V">V. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Elouadrhiri%2C+L">L. Elouadrhiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Girod%2C+F+-">F. -X. Girod</a>, <a href="/search/nucl-ex?searchtype=author&query=Niccolai%2C+S">S. Niccolai</a>, <a href="/search/nucl-ex?searchtype=author&query=Voutier%2C+E">E. Voutier</a>, <a href="/search/nucl-ex?searchtype=author&query=Afanasev%2C+A">A. Afanasev</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bernauer%2C+J+C">J. C. Bernauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianconi%2C+A">A. Bianconi</a>, <a href="/search/nucl-ex?searchtype=author&query=Capobianco%2C+R">R. Capobianco</a>, <a href="/search/nucl-ex?searchtype=author&query=Caudron%2C+M">M. Caudron</a>, <a href="/search/nucl-ex?searchtype=author&query=Causse%2C+L">L. Causse</a>, <a href="/search/nucl-ex?searchtype=author&query=Chatagnon%2C+P">P. Chatagnon</a>, <a href="/search/nucl-ex?searchtype=author&query=Chetry%2C+T">T. Chetry</a>, <a href="/search/nucl-ex?searchtype=author&query=Ciullo%2C+G">G. Ciullo</a>, <a href="/search/nucl-ex?searchtype=author&query=Cole%2C+P+L">P. L. Cole</a>, <a href="/search/nucl-ex?searchtype=author&query=Contalbrigo%2C+M">M. Contalbrigo</a>, <a href="/search/nucl-ex?searchtype=author&query=Costantini%2C+G">G. Costantini</a>, <a href="/search/nucl-ex?searchtype=author&query=Defurne%2C+M">M. Defurne</a>, <a href="/search/nucl-ex?searchtype=author&query=~Deur%2C+A">A. ~Deur</a>, <a href="/search/nucl-ex?searchtype=author&query=Diehl%2C+S">S. Diehl</a>, <a href="/search/nucl-ex?searchtype=author&query=Dupr%C3%A9%2C+R">R. Dupr茅</a>, <a href="/search/nucl-ex?searchtype=author&query=Ehrhart%2C+M">M. Ehrhart</a>, <a href="/search/nucl-ex?searchtype=author&query=Fernando%2C+I+P">I. P. Fernando</a> , et al. (35 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2103.12651v1-abstract-short" style="display: inline;"> The unpolarized and polarized Beam Char\-ge Asymmetries (BCAs) of the $\vv{e}^{\pm}p \to e^{\pm}p 纬$ process off unpolarized hydrogen are discussed. The measurement of BCAs with the CLAS12 spectrometer at the Thomas Jefferson National Accelerator Facility, using polarized positron and electron beams at 10.6 GeV is investigated. This experimental configuration allows to measure azimuthal and $t$-de… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.12651v1-abstract-full').style.display = 'inline'; document.getElementById('2103.12651v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2103.12651v1-abstract-full" style="display: none;"> The unpolarized and polarized Beam Char\-ge Asymmetries (BCAs) of the $\vv{e}^{\pm}p \to e^{\pm}p 纬$ process off unpolarized hydrogen are discussed. The measurement of BCAs with the CLAS12 spectrometer at the Thomas Jefferson National Accelerator Facility, using polarized positron and electron beams at 10.6 GeV is investigated. This experimental configuration allows to measure azimuthal and $t$-dependences of the unpolarized and polarized BCAs over a large $(x_B,Q^2)$ phase space, providing a direct access to the real part of the Compton Form Factor (CFF) ${\mathcal H}$. Additionally, these measurements confront the Bethe-Heitler dominance hypothesis and eventual effects beyond leading twist. The impact of potential positron beam data on the determination of CFFs is also investigated within a local fitting approach of experimental observables. Positron data are shown to strongly reduce correlations between CFFs and consequently improve significantly the determination of $\Re {\rm e} [\mathcal{H}]$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.12651v1-abstract-full').style.display = 'none'; document.getElementById('2103.12651v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 10 figures, Article part of the EPJA Topical Issue about "Positron beams and physics at Jefferson Lab". arXiv admin note: text overlap with arXiv:2007.15081</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2103.05419">arXiv:2103.05419</a> <span> [<a href="https://arxiv.org/pdf/2103.05419">pdf</a>, <a href="https://arxiv.org/format/2103.05419">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nuclphysa.2022.122447">10.1016/j.nuclphysa.2022.122447 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Science Requirements and Detector Concepts for the Electron-Ion Collider: EIC Yellow Report </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Khalek%2C+R+A">R. Abdul Khalek</a>, <a href="/search/nucl-ex?searchtype=author&query=Accardi%2C+A">A. Accardi</a>, <a href="/search/nucl-ex?searchtype=author&query=Adam%2C+J">J. Adam</a>, <a href="/search/nucl-ex?searchtype=author&query=Adamiak%2C+D">D. Adamiak</a>, <a href="/search/nucl-ex?searchtype=author&query=Akers%2C+W">W. Akers</a>, <a href="/search/nucl-ex?searchtype=author&query=Albaladejo%2C+M">M. Albaladejo</a>, <a href="/search/nucl-ex?searchtype=author&query=Al-bataineh%2C+A">A. Al-bataineh</a>, <a href="/search/nucl-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/nucl-ex?searchtype=author&query=Ameli%2C+F">F. Ameli</a>, <a href="/search/nucl-ex?searchtype=author&query=Antonioli%2C+P">P. Antonioli</a>, <a href="/search/nucl-ex?searchtype=author&query=Armesto%2C+N">N. Armesto</a>, <a href="/search/nucl-ex?searchtype=author&query=Armstrong%2C+W+R">W. R. Armstrong</a>, <a href="/search/nucl-ex?searchtype=author&query=Arratia%2C+M">M. Arratia</a>, <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Asaturyan%2C+A">A. Asaturyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Asai%2C+M">M. Asai</a>, <a href="/search/nucl-ex?searchtype=author&query=Aschenauer%2C+E+C">E. C. Aschenauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Aune%2C+S">S. Aune</a>, <a href="/search/nucl-ex?searchtype=author&query=Avagyan%2C+H">H. Avagyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Azmoun%2C+B">B. Azmoun</a>, <a href="/search/nucl-ex?searchtype=author&query=Bacchetta%2C+A">A. Bacchetta</a>, <a href="/search/nucl-ex?searchtype=author&query=Baker%2C+M+D">M. D. Baker</a>, <a href="/search/nucl-ex?searchtype=author&query=Barbosa%2C+F">F. Barbosa</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a> , et al. (390 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2103.05419v3-abstract-short" style="display: inline;"> This report describes the physics case, the resulting detector requirements, and the evolving detector concepts for the experimental program at the Electron-Ion Collider (EIC). The EIC will be a powerful new high-luminosity facility in the United States with the capability to collide high-energy electron beams with high-energy proton and ion beams, providing access to those regions in the nucleon… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.05419v3-abstract-full').style.display = 'inline'; document.getElementById('2103.05419v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2103.05419v3-abstract-full" style="display: none;"> This report describes the physics case, the resulting detector requirements, and the evolving detector concepts for the experimental program at the Electron-Ion Collider (EIC). The EIC will be a powerful new high-luminosity facility in the United States with the capability to collide high-energy electron beams with high-energy proton and ion beams, providing access to those regions in the nucleon and nuclei where their structure is dominated by gluons. Moreover, polarized beams in the EIC will give unprecedented access to the spatial and spin structure of the proton, neutron, and light ions. The studies leading to this document were commissioned and organized by the EIC User Group with the objective of advancing the state and detail of the physics program and developing detector concepts that meet the emerging requirements in preparation for the realization of the EIC. The effort aims to provide the basis for further development of concepts for experimental equipment best suited for the science needs, including the importance of two complementary detectors and interaction regions. This report consists of three volumes. Volume I is an executive summary of our findings and developed concepts. In Volume II we describe studies of a wide range of physics measurements and the emerging requirements on detector acceptance and performance. Volume III discusses general-purpose detector concepts and the underlying technologies to meet the physics requirements. These considerations will form the basis for a world-class experimental program that aims to increase our understanding of the fundamental structure of all visible matter <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.05419v3-abstract-full').style.display = 'none'; document.getElementById('2103.05419v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">902 pages, 415 authors, 151 institutions</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> BNL-220990-2021-FORE, JLAB-PHY-21-3198, LA-UR-21-20953 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl. Phys. A 1026 (2022) 122447 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2103.01842">arXiv:2103.01842</a> <span> [<a href="https://arxiv.org/pdf/2103.01842">pdf</a>, <a href="https://arxiv.org/format/2103.01842">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.128.102002">10.1103/PhysRevLett.128.102002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Form Factors and Two-Photon Exchange in High-Energy Elastic Electron-Proton Scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Christy%2C+M+E">M. E. Christy</a>, <a href="/search/nucl-ex?searchtype=author&query=Gautam%2C+T">T. Gautam</a>, <a href="/search/nucl-ex?searchtype=author&query=Ou%2C+L">L. Ou</a>, <a href="/search/nucl-ex?searchtype=author&query=Schmookler%2C+B">B. Schmookler</a>, <a href="/search/nucl-ex?searchtype=author&query=Wang%2C+Y">Y. Wang</a>, <a href="/search/nucl-ex?searchtype=author&query=Adikaram%2C+D">D. Adikaram</a>, <a href="/search/nucl-ex?searchtype=author&query=Ahmed%2C+Z">Z. Ahmed</a>, <a href="/search/nucl-ex?searchtype=author&query=Albataineh%2C+H">H. Albataineh</a>, <a href="/search/nucl-ex?searchtype=author&query=Ali%2C+S+F">S. F. Ali</a>, <a href="/search/nucl-ex?searchtype=author&query=Aljawrneh%2C+B">B. Aljawrneh</a>, <a href="/search/nucl-ex?searchtype=author&query=Allada%2C+K">K. Allada</a>, <a href="/search/nucl-ex?searchtype=author&query=Allison%2C+S+L">S. L. Allison</a>, <a href="/search/nucl-ex?searchtype=author&query=Alsalmi%2C+S">S. Alsalmi</a>, <a href="/search/nucl-ex?searchtype=author&query=Androic%2C+D">D. Androic</a>, <a href="/search/nucl-ex?searchtype=author&query=Aniol%2C+K">K. Aniol</a>, <a href="/search/nucl-ex?searchtype=author&query=Annand%2C+J">J. Annand</a>, <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Atac%2C+H">H. Atac</a>, <a href="/search/nucl-ex?searchtype=author&query=Averett%2C+T">T. Averett</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Bai%2C+X">X. Bai</a>, <a href="/search/nucl-ex?searchtype=author&query=Bane%2C+J">J. Bane</a>, <a href="/search/nucl-ex?searchtype=author&query=Barcus%2C+S">S. Barcus</a>, <a href="/search/nucl-ex?searchtype=author&query=Bartlett%2C+K">K. Bartlett</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellini%2C+V">V. Bellini</a> , et al. (145 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2103.01842v3-abstract-short" style="display: inline;"> We present new precision measurements of the elastic electron-proton scattering cross section for momentum transfer (Q$^2$) up to 15.75~\gevsq. Combined with existing data, these provide an improved extraction of the proton magnetic form factor at high Q$^2$ and double the range over which a longitudinal/transverse separation of the cross section can be performed. The difference between our result… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.01842v3-abstract-full').style.display = 'inline'; document.getElementById('2103.01842v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2103.01842v3-abstract-full" style="display: none;"> We present new precision measurements of the elastic electron-proton scattering cross section for momentum transfer (Q$^2$) up to 15.75~\gevsq. Combined with existing data, these provide an improved extraction of the proton magnetic form factor at high Q$^2$ and double the range over which a longitudinal/transverse separation of the cross section can be performed. The difference between our results and polarization data agrees with that observed at lower Q$^2$ and attributed to hard two-photon exchange (TPE) effects, extending to 8~(GeV/c)$^2$ the range of Q$^2$ for which a discrepancy is established at $>$95\% confidence. We use the discrepancy to quantify the size of TPE contributions needed to explain the cross section at high Q$^2$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.01842v3-abstract-full').style.display = 'none'; document.getElementById('2103.01842v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 2 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 128, 102002 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2102.07419">arXiv:2102.07419</a> <span> [<a href="https://arxiv.org/pdf/2102.07419">pdf</a>, <a href="https://arxiv.org/format/2102.07419">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.104.025203">10.1103/PhysRevC.104.025203 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of deeply virtual Compton scattering off Helium-4 with CLAS at Jefferson Lab </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Dupr%C3%A9%2C+R">R. Dupr茅</a>, <a href="/search/nucl-ex?searchtype=author&query=Hattawy%2C+M">M. Hattawy</a>, <a href="/search/nucl-ex?searchtype=author&query=Baltzell%2C+N+A">N. A. Baltzell</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%BCltmann%2C+S">S. B眉ltmann</a>, <a href="/search/nucl-ex?searchtype=author&query=De+Vita%2C+R">R. De Vita</a>, <a href="/search/nucl-ex?searchtype=author&query=Alaoui%2C+A+E">A. El Alaoui</a>, <a href="/search/nucl-ex?searchtype=author&query=Fassi%2C+L+E">L. El Fassi</a>, <a href="/search/nucl-ex?searchtype=author&query=Egiyan%2C+H">H. Egiyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Girod%2C+F+X">F. X. Girod</a>, <a href="/search/nucl-ex?searchtype=author&query=Guidal%2C+M">M. Guidal</a>, <a href="/search/nucl-ex?searchtype=author&query=Hafidi%2C+K">K. Hafidi</a>, <a href="/search/nucl-ex?searchtype=author&query=Jenkins%2C+D">D. Jenkins</a>, <a href="/search/nucl-ex?searchtype=author&query=Liuti%2C+S">S. Liuti</a>, <a href="/search/nucl-ex?searchtype=author&query=Perrin%2C+Y">Y. Perrin</a>, <a href="/search/nucl-ex?searchtype=author&query=Stepanyan%2C+S">S. Stepanyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Torayev%2C+B">B. Torayev</a>, <a href="/search/nucl-ex?searchtype=author&query=Voutier%2C+E">E. Voutier</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M+J">M. J. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Armstrong%2C+W+R">W. R. Armstrong</a>, <a href="/search/nucl-ex?searchtype=author&query=Atac%2C+H">H. Atac</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a> , et al. (116 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2102.07419v2-abstract-short" style="display: inline;"> We report on the measurement of the beam spin asymmetry in the deeply virtual Compton scattering off $^4$He using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab using a 6 GeV longitudinally polarized electron beam incident on a pressurized $^4$He gaseous target. We detail the method used to ensure the exclusivity of the measured reactions, in particular the upgrade of CLAS with a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.07419v2-abstract-full').style.display = 'inline'; document.getElementById('2102.07419v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2102.07419v2-abstract-full" style="display: none;"> We report on the measurement of the beam spin asymmetry in the deeply virtual Compton scattering off $^4$He using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab using a 6 GeV longitudinally polarized electron beam incident on a pressurized $^4$He gaseous target. We detail the method used to ensure the exclusivity of the measured reactions, in particular the upgrade of CLAS with a radial time projection chamber to detect the low-energy recoiling $^4$He nuclei and an inner calorimeter to extend the photon detection acceptance at forward angles. Our results confirm the theoretically predicted enhancement of the coherent ($e^4$He$~\to~e'$$^4$He$'纬'$) beam spin asymmetries compared to those observed on the free proton, while the incoherent ($e^4$He$~\to~e'$p$'纬'$X$'$) asymmetries exhibit a 30$\%$ suppression. From the coherent data, we were able to extract, in a model-independent way, the real and imaginary parts of the only $^4$He Compton form factor, $\cal H_A$, leading the way toward 3D imaging of the partonic structure of nuclei. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.07419v2-abstract-full').style.display = 'none'; document.getElementById('2102.07419v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 August, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 February, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 104, 025203 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2102.02658">arXiv:2102.02658</a> <span> [<a href="https://arxiv.org/pdf/2102.02658">pdf</a>, <a href="https://arxiv.org/format/2102.02658">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41567-021-01198-z">10.1038/s41567-021-01198-z <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the proton spin structure at long distances </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Zheng%2C+X">X. Zheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Deur%2C+A">A. Deur</a>, <a href="/search/nucl-ex?searchtype=author&query=Kang%2C+H">H. Kang</a>, <a href="/search/nucl-ex?searchtype=author&query=Kuhn%2C+S+E">S. E. Kuhn</a>, <a href="/search/nucl-ex?searchtype=author&query=Ripani%2C+M">M. Ripani</a>, <a href="/search/nucl-ex?searchtype=author&query=Zhang%2C+J">J. Zhang</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M+J">M. J. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Atac%2C+H">H. Atac</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianconi%2C+A">A. Bianconi</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bondi%2C+M">M. Bondi</a>, <a href="/search/nucl-ex?searchtype=author&query=Bossu%2C+F">F. Bossu</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosted%2C+P">P. Bosted</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brock%2C+J">J. Brock</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Bulumulla%2C+D">D. Bulumulla</a> , et al. (126 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2102.02658v2-abstract-short" style="display: inline;"> Measuring the spin structure of protons and neutrons tests our understanding of how they arise from quarks and gluons, the fundamental building blocks of nuclear matter. At long distances the coupling constant of the strong interaction becomes large, requiring non-perturbative methods to calculate quantum chromodynamics processes, such as lattice gauge theory or effective field theories. Here we r… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.02658v2-abstract-full').style.display = 'inline'; document.getElementById('2102.02658v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2102.02658v2-abstract-full" style="display: none;"> Measuring the spin structure of protons and neutrons tests our understanding of how they arise from quarks and gluons, the fundamental building blocks of nuclear matter. At long distances the coupling constant of the strong interaction becomes large, requiring non-perturbative methods to calculate quantum chromodynamics processes, such as lattice gauge theory or effective field theories. Here we report proton spin structure measurements from scattering a polarized electron beam off polarized protons. The spin-dependent cross-sections were measured at large distances, corresponding to the region of low momentum transfer squared between 0.012 and 1.0 GeV$^2$. This kinematic range provides unique tests of chiral effective field theory predictions. Our results show that a complete description of the nucleon spin remains elusive, and call for further theoretical works, e.g. in lattice quantum chromodynamics. Finally, our data extrapolated to the photon point agree with the Gerasimov-Drell-Hearn sum rule, a fundamental prediction of quantum field theory that relates the anomalous magnetic moment of the proton to its integrated spin-dependent cross-sections. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.02658v2-abstract-full').style.display = 'none'; document.getElementById('2102.02658v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 February, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Published version. 10 pages, 5 figures. 20 pages of supplementary material (data tables and a figure)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-20-3251, DOE/OR/23177-5042 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Physics, vo. 17 736-741 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2011.11125">arXiv:2011.11125</a> <span> [<a href="https://arxiv.org/pdf/2011.11125">pdf</a>, <a href="https://arxiv.org/format/2011.11125">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.127.152301">10.1103/PhysRevLett.127.152301 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Deep exclusive electroproduction of $蟺^0$ at high $Q^2$ in the quark valence regime </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=The+Jefferson+Lab+Hall+A+Collaboration"> The Jefferson Lab Hall A Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Dlamini%2C+M">M. Dlamini</a>, <a href="/search/nucl-ex?searchtype=author&query=Karki%2C+B">B. Karki</a>, <a href="/search/nucl-ex?searchtype=author&query=Ali%2C+S+F">S. F. Ali</a>, <a href="/search/nucl-ex?searchtype=author&query=Lin%2C+P">P-J. Lin</a>, <a href="/search/nucl-ex?searchtype=author&query=Georges%2C+F">F. Georges</a>, <a href="/search/nucl-ex?searchtype=author&query=Ko%2C+H">H-S Ko</a>, <a href="/search/nucl-ex?searchtype=author&query=Israel%2C+N">N. Israel</a>, <a href="/search/nucl-ex?searchtype=author&query=Rashad%2C+M+N+H">M. N. H. Rashad</a>, <a href="/search/nucl-ex?searchtype=author&query=Stefanko%2C+A">A. Stefanko</a>, <a href="/search/nucl-ex?searchtype=author&query=Adikaram%2C+D">D. Adikaram</a>, <a href="/search/nucl-ex?searchtype=author&query=Ahmed%2C+Z">Z. Ahmed</a>, <a href="/search/nucl-ex?searchtype=author&query=Albataineh%2C+H">H. Albataineh</a>, <a href="/search/nucl-ex?searchtype=author&query=Aljawrneh%2C+B">B. Aljawrneh</a>, <a href="/search/nucl-ex?searchtype=author&query=Allada%2C+K">K. Allada</a>, <a href="/search/nucl-ex?searchtype=author&query=Allison%2C+S">S. Allison</a>, <a href="/search/nucl-ex?searchtype=author&query=Alsalmi%2C+S">S. Alsalmi</a>, <a href="/search/nucl-ex?searchtype=author&query=Androic%2C+D">D. Androic</a>, <a href="/search/nucl-ex?searchtype=author&query=Aniol%2C+K">K. Aniol</a>, <a href="/search/nucl-ex?searchtype=author&query=Annand%2C+J">J. Annand</a>, <a href="/search/nucl-ex?searchtype=author&query=Atac%2C+H">H. Atac</a>, <a href="/search/nucl-ex?searchtype=author&query=Averett%2C+T">T. Averett</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Bai%2C+X">X. Bai</a>, <a href="/search/nucl-ex?searchtype=author&query=Bane%2C+J">J. Bane</a> , et al. (137 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2011.11125v2-abstract-short" style="display: inline;"> We report measurements of the exclusive neutral pion electroproduction cross section off protons at large values of $x_B$ (0.36, 0.48 and 0.60) and $Q^2$ (3.1 to 8.4 GeV$^2$) obtained from Jefferson Lab Hall A experiment E12-06-014. The corresponding structure functions $d蟽_L/dt+蔚d蟽_T/dt$, $d蟽_{TT}/dt$, $d蟽_{LT}/dt$ and $d蟽_{LT'}/dt$ are extracted as a function of the proton momentum transfer… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.11125v2-abstract-full').style.display = 'inline'; document.getElementById('2011.11125v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2011.11125v2-abstract-full" style="display: none;"> We report measurements of the exclusive neutral pion electroproduction cross section off protons at large values of $x_B$ (0.36, 0.48 and 0.60) and $Q^2$ (3.1 to 8.4 GeV$^2$) obtained from Jefferson Lab Hall A experiment E12-06-014. The corresponding structure functions $d蟽_L/dt+蔚d蟽_T/dt$, $d蟽_{TT}/dt$, $d蟽_{LT}/dt$ and $d蟽_{LT'}/dt$ are extracted as a function of the proton momentum transfer $t-t_{min}$. The results suggest the amplitude for transversely polarized virtual photons continues to dominate the cross-section throughout this kinematic range. The data are well described by calculations based on transversity Generalized Parton Distributions coupled to a helicity flip Distribution Amplitude of the pion, thus providing a unique way to probe the structure of the nucleon. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.11125v2-abstract-full').style.display = 'none'; document.getElementById('2011.11125v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 127, 152301 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2010.09544">arXiv:2010.09544</a> <span> [<a href="https://arxiv.org/pdf/2010.09544">pdf</a>, <a href="https://arxiv.org/format/2010.09544">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.126.062002">10.1103/PhysRevLett.126.062002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Beam spin asymmetry in semi-inclusive electroproduction of a hadron pair </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Mirazita%2C+M">M. Mirazita</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Courtoy%2C+A">A. Courtoy</a>, <a href="/search/nucl-ex?searchtype=author&query=Pisano%2C+S">S. Pisano</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M+J">M. J. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Angelini%2C+G">G. Angelini</a>, <a href="/search/nucl-ex?searchtype=author&query=Atac%2C+H">H. Atac</a>, <a href="/search/nucl-ex?searchtype=author&query=Baltzell%2C+N+A">N. A. Baltzell</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">Fatiha Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianconi%2C+A">A. Bianconi</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Bossu%27%2C+F">F. Bossu'</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Bulumulla%2C+D">D. Bulumulla</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V+D">V. D. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Carman%2C+D+S">D. S. Carman</a>, <a href="/search/nucl-ex?searchtype=author&query=Carvajal%2C+J+C">J. C. Carvajal</a>, <a href="/search/nucl-ex?searchtype=author&query=Celentano%2C+A">A. Celentano</a>, <a href="/search/nucl-ex?searchtype=author&query=Chatagnon%2C+P">P. Chatagnon</a> , et al. (118 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2010.09544v1-abstract-short" style="display: inline;"> A first measurement of the longitudinal beam spin asymmetry ALU in the semi-inclusive electroproduction of pairs of charged pions is reported. ALU is a higher-twist observable and offers the cleanest access to the nucleon twist-3 parton distribution function e(x). Data have been collected in the Hall-B at Jefferson Lab by impinging a 5.498 GeV electron beam on a liquid-hydrogen target, and reconst… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.09544v1-abstract-full').style.display = 'inline'; document.getElementById('2010.09544v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2010.09544v1-abstract-full" style="display: none;"> A first measurement of the longitudinal beam spin asymmetry ALU in the semi-inclusive electroproduction of pairs of charged pions is reported. ALU is a higher-twist observable and offers the cleanest access to the nucleon twist-3 parton distribution function e(x). Data have been collected in the Hall-B at Jefferson Lab by impinging a 5.498 GeV electron beam on a liquid-hydrogen target, and reconstructing the scattered electron and the pion pair with the CLAS detector. One-dimensional projections of the sin(phiR) moments of ALU are extracted for the kinematic variables of interest in the valence quark region. The understanding of di-hadron production is essential for the interpretation of observables in single hadron production in semi-inclusive DIS, and pioneering measurements of single spin asymmetries in di-hadron production open a new avenue in studies of QCD dynamics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.09544v1-abstract-full').style.display = 'none'; document.getElementById('2010.09544v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 October, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 126, 062002 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.03413">arXiv:2009.03413</a> <span> [<a href="https://arxiv.org/pdf/2009.03413">pdf</a>, <a href="https://arxiv.org/format/2009.03413">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Precision measurements of A=3 nuclei in Hall B </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Hen%2C+O">Or Hen</a>, <a href="/search/nucl-ex?searchtype=author&query=Meekins%2C+D">Dave Meekins</a>, <a href="/search/nucl-ex?searchtype=author&query=Nguyen%2C+D">Dien Nguyen</a>, <a href="/search/nucl-ex?searchtype=author&query=Piasetzky%2C+E">Eli Piasetzky</a>, <a href="/search/nucl-ex?searchtype=author&query=Schmidt%2C+A">Axel Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Szumila-Vance%2C+H">Holly Szumila-Vance</a>, <a href="/search/nucl-ex?searchtype=author&query=Weinstein%2C+L">Lawrence Weinstein</a>, <a href="/search/nucl-ex?searchtype=author&query=Alsalmi%2C+S">Sheren Alsalmi</a>, <a href="/search/nucl-ex?searchtype=author&query=Ayerbe-Gayoso%2C+C">Carlos Ayerbe-Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Baashen%2C+L">Lamya Baashen</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+A">Arie Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+S">Sharon Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">Fatiha Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=Boyer%2C+A">Aiden Boyer</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W">William Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W">William Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Capobianco%2C+R">Richard Capobianco</a>, <a href="/search/nucl-ex?searchtype=author&query=Chetry%2C+T">Taya Chetry</a>, <a href="/search/nucl-ex?searchtype=author&query=Christy%2C+E">Eric Christy</a>, <a href="/search/nucl-ex?searchtype=author&query=Cruz-Torres%2C+R">Reynier Cruz-Torres</a>, <a href="/search/nucl-ex?searchtype=author&query=Dashyan%2C+N">Natalya Dashyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Denniston%2C+A">Andrew Denniston</a>, <a href="/search/nucl-ex?searchtype=author&query=Diehl%2C+S">Stefan Diehl</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutta%2C+D">Dipangkar Dutta</a>, <a href="/search/nucl-ex?searchtype=author&query=Fassi%2C+L+E">Lamiaa El Fassi</a> , et al. (33 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2009.03413v2-abstract-short" style="display: inline;"> We propose a high-statistics measurement of few body nuclear structure and short range correlations in quasi-elastic scattering at 6.6 GeV from $^2$H, $^3$He and $^3$H targets in Hall B with the CLAS12 detector. We will measure absolute cross sections for $(e,e'p)$ and $(e,e'pN)$ quasi-elastic reaction channels up to a missing momentum $p_{miss} \approx 1$ GeV/c over a wide range of $Q^2$ and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.03413v2-abstract-full').style.display = 'inline'; document.getElementById('2009.03413v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.03413v2-abstract-full" style="display: none;"> We propose a high-statistics measurement of few body nuclear structure and short range correlations in quasi-elastic scattering at 6.6 GeV from $^2$H, $^3$He and $^3$H targets in Hall B with the CLAS12 detector. We will measure absolute cross sections for $(e,e'p)$ and $(e,e'pN)$ quasi-elastic reaction channels up to a missing momentum $p_{miss} \approx 1$ GeV/c over a wide range of $Q^2$ and $x_B$ and construct the isoscalar sum of $^3$H and $^3$He. We will compare $(e,e'p)$ cross sections to nuclear theory predictions using a wide variety of techniques and $NN$ interactions in order to constrain the $NN$ interaction at short distances. We will measure $(e,e'pN)$ quasi-elastic reaction cross sections and $(e,e'pN)/(e,e'p)$ ratios to understand short range correlated (SRC) $NN$ pairs in the simplest non-trivial system. $^3$H and $^3$He, being mirror nuclei, exploit the maximum available isospin asymmetry. They are light enough that their ground states are readily calculable, but they already exhibit complex nuclear behavior, including $NN$ SRCs. We will also measure $^2$H$(e,e'p)$ in order to help theorists constrain non-quasielastic reaction mechanisms in order to better calculate reactions on $A=3$ nuclei. Measuring all three few body nuclei together is critical, in order to understand and minimize different reaction effects, such as single charge exchange final state interactions, in order to test ground-state nuclear models. We will also measure the ratio of inclusive $(e,e')$ quasi-elastic cross sections (integrated over $x_B$) from $^3$He and $^3$H in order to extract the neutron magnetic form factor $G_M^n$ at small and moderate values of $Q^2$. We will measure this at both 6.6 GeV and 2.2 GeV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.03413v2-abstract-full').style.display = 'none'; document.getElementById('2009.03413v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 7 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Final version of the Proposal [PR12-20-005] approved by JLab PAC48</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2007.15677">arXiv:2007.15677</a> <span> [<a href="https://arxiv.org/pdf/2007.15677">pdf</a>, <a href="https://arxiv.org/format/2007.15677">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.125.182001">10.1103/PhysRevLett.125.182001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Extraction of beam-spin asymmetries from the hard exclusive $蟺^{+}$ channel off protons in a wide range of kinematics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Diehl%2C+S">S. Diehl</a>, <a href="/search/nucl-ex?searchtype=author&query=Joo%2C+K">K. Joo</a>, <a href="/search/nucl-ex?searchtype=author&query=Kim%2C+A">A. Kim</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Kroll%2C+P">P. Kroll</a>, <a href="/search/nucl-ex?searchtype=author&query=Park%2C+K">K. Park</a>, <a href="/search/nucl-ex?searchtype=author&query=Riser%2C+D">D. Riser</a>, <a href="/search/nucl-ex?searchtype=author&query=Semenov-Tian-Shansky%2C+K">K. Semenov-Tian-Shansky</a>, <a href="/search/nucl-ex?searchtype=author&query=Tezgin%2C+K">K. Tezgin</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M+J">M. J. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Angelini%2C+G">G. Angelini</a>, <a href="/search/nucl-ex?searchtype=author&query=Asryan%2C+G">G. Asryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Atac%2C+H">H. Atac</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianconi%2C+A">A. Bianconi</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Boss%60u%2C+F">F. Boss`u</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a> , et al. (113 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2007.15677v1-abstract-short" style="display: inline;"> We have measured beam-spin asymmetries to extract the $\sin蠁$ moment $A_{LU}^{\sin蠁}$ from the hard exclusive $\vec{e} p \to e^\prime n 蟺^+$ reaction above the resonance region, for the first time with nearly full coverage from forward to backward angles in the center-of-mass. The $A_{LU}^{\sin蠁}$ moment has been measured up to 6.6 GeV$^{2}$ in $-t$, covering the kinematic regimes of Generalized P… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.15677v1-abstract-full').style.display = 'inline'; document.getElementById('2007.15677v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2007.15677v1-abstract-full" style="display: none;"> We have measured beam-spin asymmetries to extract the $\sin蠁$ moment $A_{LU}^{\sin蠁}$ from the hard exclusive $\vec{e} p \to e^\prime n 蟺^+$ reaction above the resonance region, for the first time with nearly full coverage from forward to backward angles in the center-of-mass. The $A_{LU}^{\sin蠁}$ moment has been measured up to 6.6 GeV$^{2}$ in $-t$, covering the kinematic regimes of Generalized Parton Distributions (GPD) and baryon-to-meson Transition Distribution Amplitudes (TDA) at the same time. The experimental results in very forward kinematics demonstrate the sensitivity to chiral-odd and chiral-even GPDs. In very backward kinematics where the TDA framework is applicable, we found $A_{LU}^{\sin蠁}$ to be negative, while a sign change was observed near 90$^\circ$ in the center-of-mass. The unique results presented in this paper will provide critical constraints to establish reaction mechanisms that can help to further develop the GPD and TDA frameworks. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.15677v1-abstract-full').style.display = 'none'; document.getElementById('2007.15677v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 July, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 125, 182001 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2007.15081">arXiv:2007.15081</a> <span> [<a href="https://arxiv.org/pdf/2007.15081">pdf</a>, <a href="https://arxiv.org/format/2007.15081">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epja/s10050-021-00564-y">10.1140/epja/s10050-021-00564-y <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> An experimental program with high duty-cycle polarized and unpolarized positron beams at Jefferson Lab </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Accardi%2C+A">A. Accardi</a>, <a href="/search/nucl-ex?searchtype=author&query=Afanasev%2C+A">A. Afanasev</a>, <a href="/search/nucl-ex?searchtype=author&query=Albayrak%2C+I">I. Albayrak</a>, <a href="/search/nucl-ex?searchtype=author&query=Ali%2C+S+F">S. F. Ali</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M">M. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Annand%2C+J+R+M">J. R. M. Annand</a>, <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Asaturyan%2C+A">A. Asaturyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Atac%2C+H">H. Atac</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Averett%2C+T">T. Averett</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Bai%2C+X">X. Bai</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellini%2C+V">V. Bellini</a>, <a href="/search/nucl-ex?searchtype=author&query=Beminiwattha%2C+R">R. Beminiwattha</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=Berdnikov%2C+V+V">V. V. Berdnikov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bernauer%2C+J+C">J. C. Bernauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertone%2C+V">V. Bertone</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianconi%2C+A">A. Bianconi</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A">A. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Bisio%2C+P">P. Bisio</a>, <a href="/search/nucl-ex?searchtype=author&query=Blunden%2C+P">P. Blunden</a> , et al. (205 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2007.15081v2-abstract-short" style="display: inline;"> Positron beams, both polarized and unpolarized, are identified as essential ingredients for the experimental programs at the next generation of lepton accelerators. In the context of the hadronic physics program at Jefferson Lab (JLab), positron beams are complementary, even essential, tools for a precise understanding of the electromagnetic structure of nucleons and nuclei, in both the elastic an… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.15081v2-abstract-full').style.display = 'inline'; document.getElementById('2007.15081v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2007.15081v2-abstract-full" style="display: none;"> Positron beams, both polarized and unpolarized, are identified as essential ingredients for the experimental programs at the next generation of lepton accelerators. In the context of the hadronic physics program at Jefferson Lab (JLab), positron beams are complementary, even essential, tools for a precise understanding of the electromagnetic structure of nucleons and nuclei, in both the elastic and deep-inelastic regimes. For instance, elastic scattering of polarized and unpolarized electrons and positrons from the nucleon enables a model independent determination of its electromagnetic form factors. Also, the deeply-virtual scattering of polarized and unpolarized electrons and positrons allows unambiguous separation of the different contributions to the cross section of the lepto-production of photons and of lepton-pairs, enabling an accurate determination of the nucleons and nuclei generalized parton distributions, and providing an access to the gravitational form factors. Furthermore, positron beams offer the possibility of alternative tests of the Standard Model of particle physics through the search of a dark photon, the precise measurement of electroweak couplings, and the investigation of charged lepton flavor violation. This document discusses the perspectives of an experimental program with high duty-cycle positron beams at JLab. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.15081v2-abstract-full').style.display = 'none'; document.getElementById('2007.15081v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 May, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 July, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">18 pages, 7 figures This version superseeds the previous version which scientific content was decomposed into several more elaborated articles. All of these articles will be collected in the EPJ A Topical Issue about "Positron beam and physics at Jefferson Lab (e+@Jlab)"</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2006.01361">arXiv:2006.01361</a> <span> [<a href="https://arxiv.org/pdf/2006.01361">pdf</a>, <a href="https://arxiv.org/format/2006.01361">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.102.065203">10.1103/PhysRevC.102.065203 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Photoproduction of $畏$ mesons off the proton for $1.2 < E_纬< 4.7$ GeV using CLAS at Jefferson Laboratory </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Hu%2C+T">T. Hu</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Crede%2C+V">V. Crede</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M+J">M. J. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Angelini%2C+G">G. Angelini</a>, <a href="/search/nucl-ex?searchtype=author&query=Asryan%2C+G">G. Asryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Atac%2C+H">H. Atac</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianconi%2C+A">A. Bianconi</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Bossu%2C+F">F. Bossu</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Carman%2C+D+S">D. S. Carman</a>, <a href="/search/nucl-ex?searchtype=author&query=Carvajal%2C+J">J. Carvajal</a>, <a href="/search/nucl-ex?searchtype=author&query=Celentano%2C+A">A. Celentano</a>, <a href="/search/nucl-ex?searchtype=author&query=Chatagnon%2C+P">P. Chatagnon</a>, <a href="/search/nucl-ex?searchtype=author&query=Chetry%2C+T">T. Chetry</a> , et al. (126 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2006.01361v3-abstract-short" style="display: inline;"> Photoproduction cross sections are reported for the reaction $纬p\to p畏$ using energy-tagged photons and the CLAS spectrometer at Jefferson Laboratory. The $畏$ mesons are detected in their dominant charged decay mode, $畏\to 蟺^+蟺^-蟺^0$, and results on differential cross sections are presented for incident photon energies between 1.2 and 4.7 GeV. These new $畏$ photoproduction data are consistent with… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.01361v3-abstract-full').style.display = 'inline'; document.getElementById('2006.01361v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.01361v3-abstract-full" style="display: none;"> Photoproduction cross sections are reported for the reaction $纬p\to p畏$ using energy-tagged photons and the CLAS spectrometer at Jefferson Laboratory. The $畏$ mesons are detected in their dominant charged decay mode, $畏\to 蟺^+蟺^-蟺^0$, and results on differential cross sections are presented for incident photon energies between 1.2 and 4.7 GeV. These new $畏$ photoproduction data are consistent with earlier CLAS results but extend the energy range beyond the nucleon resonance region into the Regge regime. The normalized angular distributions are also compared with the experimental results from several other experiments, and with predictions of $畏$ MAID\,2018 and the latest solution of the Bonn-Gatchina coupled-channel analysis. Differential cross sections $d蟽/dt$ are presented for incident photon energies $E_纬> 2.9$ GeV ($W > 2.5$ GeV), and compared with predictions which are based on Regge trajectories exchange in the $t$-channel (Regge models). The data confirm the expected dominance of $蟻$, $蠅$ vector-meson exchange in an analysis by the Joint Physics Analysis Center. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.01361v3-abstract-full').style.display = 'none'; document.getElementById('2006.01361v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 December, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">24 pages, 22 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-20-3201 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 102, 065203 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2004.11221">arXiv:2004.11221</a> <span> [<a href="https://arxiv.org/pdf/2004.11221">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41586-020-2021-6">10.1038/s41586-020-2021-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Probing the core of the strong nuclear interaction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Schmidt%2C+A">A. Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Pybus%2C+J+R">J. R. Pybus</a>, <a href="/search/nucl-ex?searchtype=author&query=Weiss%2C+R">R. Weiss</a>, <a href="/search/nucl-ex?searchtype=author&query=Segarra%2C+E+P">E. P. Segarra</a>, <a href="/search/nucl-ex?searchtype=author&query=Hrnjic%2C+A">A. Hrnjic</a>, <a href="/search/nucl-ex?searchtype=author&query=Denniston%2C+A">A. Denniston</a>, <a href="/search/nucl-ex?searchtype=author&query=Hen%2C+O">O. Hen</a>, <a href="/search/nucl-ex?searchtype=author&query=Piasetzky%2C+E">E. Piasetzky</a>, <a href="/search/nucl-ex?searchtype=author&query=Weinstein%2C+L+B">L. B. Weinstein</a>, <a href="/search/nucl-ex?searchtype=author&query=Barnea%2C+N">N. Barnea</a>, <a href="/search/nucl-ex?searchtype=author&query=Strikman%2C+M">M. Strikman</a>, <a href="/search/nucl-ex?searchtype=author&query=Larionov%2C+A">A. Larionov</a>, <a href="/search/nucl-ex?searchtype=author&query=Higinbotham%2C+D">D. Higinbotham</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M">M. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Angelini%2C+G">G. Angelini</a>, <a href="/search/nucl-ex?searchtype=author&query=Asryan%2C+G">G. Asryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Atac%2C+H">H. Atac</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Baashen%2C+L">L. Baashen</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Bashkanov%2C+M">M. Bashkanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+A">A. Beck</a> , et al. (140 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2004.11221v2-abstract-short" style="display: inline;"> The strong nuclear interaction between nucleons (protons and neutrons) is the effective force that holds the atomic nucleus together. This force stems from fundamental interactions between quarks and gluons (the constituents of nucleons) that are described by the equations of Quantum Chromodynamics (QCD). However, as these equations cannot be solved directly, physicists resort to describing nuclea… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2004.11221v2-abstract-full').style.display = 'inline'; document.getElementById('2004.11221v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2004.11221v2-abstract-full" style="display: none;"> The strong nuclear interaction between nucleons (protons and neutrons) is the effective force that holds the atomic nucleus together. This force stems from fundamental interactions between quarks and gluons (the constituents of nucleons) that are described by the equations of Quantum Chromodynamics (QCD). However, as these equations cannot be solved directly, physicists resort to describing nuclear interactions using effective models that are well constrained at typical inter-nucleon distances in nuclei but not at shorter distances. This limits our ability to describe high-density nuclear matter such as in the cores of neutron stars. Here we use high-energy electron scattering measurements that isolate nucleon pairs in short-distance, high-momentum configurations thereby accessing a kinematical regime that has not been previously explored by experiments, corresponding to relative momenta above 400 MeV/c. As the relative momentum between two nucleons increases and their separation thereby decreases, we observe a transition from a spin-dependent tensor-force to a predominantly spin-independent scalar-force. These results demonstrate the power of using such measurements to study the nuclear interaction at short-distances and also support the use of point-like nucleons with two- and three-body effective interactions to describe nuclear systems up to densities several times higher than the central density of atomic nuclei. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2004.11221v2-abstract-full').style.display = 'none'; document.getElementById('2004.11221v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 October, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 April, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Total 26 pages, 13 figures. Main text: 8 pages, 3 figures. Methods section: 6 pages. Extended Data: 8 figures, 1 table. Supplementary Materials: 8 pages, 2 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature vol. 578 pp. 540-544 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1908.00949">arXiv:1908.00949</a> <span> [<a href="https://arxiv.org/pdf/1908.00949">pdf</a>, <a href="https://arxiv.org/format/1908.00949">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Neutron DVCS Measurements with BONuS12 in CLAS12 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Hattawy%2C+M">M. Hattawy</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M">M. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%BCltmann%2C+S">S. B眉ltmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Dodge%2C+G">G. Dodge</a>, <a href="/search/nucl-ex?searchtype=author&query=Dzbenski%2C+N">N. Dzbenski</a>, <a href="/search/nucl-ex?searchtype=author&query=Hyde%2C+C">C. Hyde</a>, <a href="/search/nucl-ex?searchtype=author&query=Kuhn%2C+S">S. Kuhn</a>, <a href="/search/nucl-ex?searchtype=author&query=Payette%2C+D">D. Payette</a>, <a href="/search/nucl-ex?searchtype=author&query=Poudel%2C+J">J. Poudel</a>, <a href="/search/nucl-ex?searchtype=author&query=Weinstein%2C+L">L. Weinstein</a>, <a href="/search/nucl-ex?searchtype=author&query=Dupr%C3%A9%2C+R">R. Dupr茅</a>, <a href="/search/nucl-ex?searchtype=author&query=Guidal%2C+M">M. Guidal</a>, <a href="/search/nucl-ex?searchtype=author&query=Marchand%2C+D">D. Marchand</a>, <a href="/search/nucl-ex?searchtype=author&query=Mu%C3%B1oz%2C+C">C. Mu帽oz</a>, <a href="/search/nucl-ex?searchtype=author&query=Niccolai%2C+S">S. Niccolai</a>, <a href="/search/nucl-ex?searchtype=author&query=Voutier%2C+E">E. Voutier</a>, <a href="/search/nucl-ex?searchtype=author&query=Hafidi%2C+K">K. Hafidi</a>, <a href="/search/nucl-ex?searchtype=author&query=Yi%2C+Z">Z. Yi</a>, <a href="/search/nucl-ex?searchtype=author&query=Chetry%2C+T">T. Chetry</a>, <a href="/search/nucl-ex?searchtype=author&query=El-Fassi%2C+L">L. El-Fassi</a>, <a href="/search/nucl-ex?searchtype=author&query=Baltzell%2C+N">N. Baltzell</a>, <a href="/search/nucl-ex?searchtype=author&query=Gavalian%2C+G">G. Gavalian</a>, <a href="/search/nucl-ex?searchtype=author&query=Girod%2C+F+X">F. X. Girod</a>, <a href="/search/nucl-ex?searchtype=author&query=Stepanyan%2C+S">S. Stepanyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Albayrak%2C+I">I. Albayrak</a> , et al. (5 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1908.00949v1-abstract-short" style="display: inline;"> The three-dimensional picture of quarks and gluons in the nucleon is set to be revealed through deeply virtual Compton scattering (DVCS). With the absence of a free neutron target, the deuterium target represents the simplest nucleus to be used to probe the internal 3D partonic structure of the neutron. We propose here to measure the beam spin asymmetry (BSA) in incoherent neutron DVCS together wi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1908.00949v1-abstract-full').style.display = 'inline'; document.getElementById('1908.00949v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1908.00949v1-abstract-full" style="display: none;"> The three-dimensional picture of quarks and gluons in the nucleon is set to be revealed through deeply virtual Compton scattering (DVCS). With the absence of a free neutron target, the deuterium target represents the simplest nucleus to be used to probe the internal 3D partonic structure of the neutron. We propose here to measure the beam spin asymmetry (BSA) in incoherent neutron DVCS together with the approved E12-06-113 experiment (BONuS12) within the run group F, using the same beam time, simply with addition of beam polarization. The DVCS BSA on the quasi-free neutron will be measured in a wide range of kinematics by tagging the scattered electron and the real photon final state with the spectator proton. We will also measure BSA with all final state particles detected including the struck neutron. The proposed measurements is complementary to the approved CLAS12 experiment E12-11-003, which will also measure the quasi-free neutron DVCS by detecting the scattered neutron, but not the spectator proton. Indeed, besides providing more data for neutron DVCS, this experiment will allow a comparison of the measurement of the BSA of neutron DVCS from the approved E12-11-003 with the measurements using the two methods proposed herein. This comparison will help to understand the impact of nuclear effects, such as the final state interactions (FSI) and Fermi motion on the measurement of the neutron DVCS. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1908.00949v1-abstract-full').style.display = 'none'; document.getElementById('1908.00949v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 August, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1907.11974">arXiv:1907.11974</a> <span> [<a href="https://arxiv.org/pdf/1907.11974">pdf</a>, <a href="https://arxiv.org/format/1907.11974">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.101.015208">10.1103/PhysRevC.101.015208 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Exclusive $\bm{蟺^{0}p}$ electroproduction off protons in the resonance region at photon virtualities 0.4~GeV$\bm{^{2}}$ $\bm{\leq~ Q^{2} \leq~1}$~GeV$\bm{^{2}}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Markov%2C+N">N. Markov</a>, <a href="/search/nucl-ex?searchtype=author&query=Joo%2C+K">K. Joo</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V+D">V. D. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Mokeev%2C+V+I">V. I. Mokeev</a>, <a href="/search/nucl-ex?searchtype=author&query=Smith%2C+L+C">L. C. Smith</a>, <a href="/search/nucl-ex?searchtype=author&query=Ungaro%2C+M">M. Ungaro</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=~Amaryan%2C+M+J">M. J. ~Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Angelini%2C+G">G. Angelini</a>, <a href="/search/nucl-ex?searchtype=author&query=~Atac%2C+H">H. ~Atac</a>, <a href="/search/nucl-ex?searchtype=author&query=~Avakian%2C+H">H. ~Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=~Baltzell%2C+N+A">N. A. ~Baltzell</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=~Battaglieri%2C+M">M. ~Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=~Bedlinskiy%2C+I">I. ~Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=~Bedlinskiy%2C+I">I. ~Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=~Biselli%2C+A+S">A. S. ~Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=~Boss%C3%B9%2C+F">F. ~Boss霉</a>, <a href="/search/nucl-ex?searchtype=author&query=~Boiarinov%2C+S">S. ~Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=~Briscoe%2C+W+J">W. J. ~Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=~Brooks%2C+W+K">W. K. ~Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=~Carman%2C+D+S">D. S. ~Carman</a>, <a href="/search/nucl-ex?searchtype=author&query=~Carvajal%2C+J+C">J. C. ~Carvajal</a> , et al. (99 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1907.11974v1-abstract-short" style="display: inline;"> The exclusive electroproduction process $ep \rightarrow e'p'蟺^{0}$ was measured in the range of photon virtualities $Q^{2} = 0.4 - 1.0$~GeV$^{2}$ and the invariant mass range of the $p蟺^{0}$ system of $W = 1.1 - 1.8$~GeV. These kinematics are covered in exclusive $蟺^{0}$ electroproduction off the proton with nearly complete angular coverage in the $p蟺^{0}$ center-of-mass system and with high stati… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.11974v1-abstract-full').style.display = 'inline'; document.getElementById('1907.11974v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1907.11974v1-abstract-full" style="display: none;"> The exclusive electroproduction process $ep \rightarrow e'p'蟺^{0}$ was measured in the range of photon virtualities $Q^{2} = 0.4 - 1.0$~GeV$^{2}$ and the invariant mass range of the $p蟺^{0}$ system of $W = 1.1 - 1.8$~GeV. These kinematics are covered in exclusive $蟺^{0}$ electroproduction off the proton with nearly complete angular coverage in the $p蟺^{0}$ center-of-mass system and with high statistical accuracy. Nearly 36000 cross section points were measured, and the structure functions $蟽_T+蔚蟽_L$, $蟽_{LT}$, and $蟽_{TT}$, were extracted via fitting the $蠁_{蟺^{0}}$ dependence of the cross section. A Legendre polynomial expansion analysis demonstrates the sensitivity of our data to high-lying $N^*$ and $螖^{*}$ resonances with $M~>~1.6$ GeV. As part of a broad effort to determine the electrocouplings of the $N^{*}$ and $螖^{*}$ resonances using both single- and double-pion electroproduction, this dataset is crucial for the reliable extraction of the high-lying resonance electrocouplings from the combined isospin analysis of the $N 蟺$ and $蟺^{+}蟺^{-} p$ channels. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.11974v1-abstract-full').style.display = 'none'; document.getElementById('1907.11974v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 July, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">21 pages, 24 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 101, 015208 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1812.07628">arXiv:1812.07628</a> <span> [<a href="https://arxiv.org/pdf/1812.07628">pdf</a>, <a href="https://arxiv.org/format/1812.07628">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.123.032502">10.1103/PhysRevLett.123.032502 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Exploring the Structure of the Bound Proton with Deeply Virtual Compton Scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Hattawy%2C+M">M. Hattawy</a>, <a href="/search/nucl-ex?searchtype=author&query=Baltzell%2C+N+A">N. A. Baltzell</a>, <a href="/search/nucl-ex?searchtype=author&query=Dupr%C3%A9%2C+R">R. Dupr茅</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%BCltmann%2C+S">S. B眉ltmann</a>, <a href="/search/nucl-ex?searchtype=author&query=De+Vita%2C+R">R. De Vita</a>, <a href="/search/nucl-ex?searchtype=author&query=Alaoui%2C+A+E">A. El Alaoui</a>, <a href="/search/nucl-ex?searchtype=author&query=Fassi%2C+L+E">L. El Fassi</a>, <a href="/search/nucl-ex?searchtype=author&query=Egiyan%2C+H">H. Egiyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Girod%2C+F+X">F. X. Girod</a>, <a href="/search/nucl-ex?searchtype=author&query=Guidal%2C+M">M. Guidal</a>, <a href="/search/nucl-ex?searchtype=author&query=Hafidi%2C+K">K. Hafidi</a>, <a href="/search/nucl-ex?searchtype=author&query=Jenkins%2C+D">D. Jenkins</a>, <a href="/search/nucl-ex?searchtype=author&query=Liuti%2C+S">S. Liuti</a>, <a href="/search/nucl-ex?searchtype=author&query=Perrin%2C+Y">Y. Perrin</a>, <a href="/search/nucl-ex?searchtype=author&query=Stepanyan%2C+S">S. Stepanyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Torayev%2C+B">B. Torayev</a>, <a href="/search/nucl-ex?searchtype=author&query=Voutier%2C+E">E. Voutier</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Angelini%2C+G">Giovanni Angelini</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Boss%C3%B9%2C+F">F. Boss霉</a> , et al. (103 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1812.07628v2-abstract-short" style="display: inline;"> In the past two decades, deeply virtual Compton scattering of electrons has been successfully used to advance our knowledge of the partonic structure of the free proton and investigate correlations between the transverse position and the longitudinal momentum of quarks inside the nucleon. Meanwhile, the structure of bound nucleons in nuclei has been studied in inclusive deep-inelastic lepton scatt… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.07628v2-abstract-full').style.display = 'inline'; document.getElementById('1812.07628v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1812.07628v2-abstract-full" style="display: none;"> In the past two decades, deeply virtual Compton scattering of electrons has been successfully used to advance our knowledge of the partonic structure of the free proton and investigate correlations between the transverse position and the longitudinal momentum of quarks inside the nucleon. Meanwhile, the structure of bound nucleons in nuclei has been studied in inclusive deep-inelastic lepton scattering experiments off nuclear targets, showing a significant difference in longitudinal momentum distribution of quarks inside the bound nucleon, known as the EMC effect. In this work, we report the first beam spin asymmetry (BSA) measurement of exclusive deeply virtual Compton scattering (DVCS) off a proton bound in $^4$He. The data used here were accumulated using a $6$ GeV longitudinally polarized electron beam incident on a pressurized $^4$He gaseous target placed within the CLAS spectrometer in Hall-B at the Thomas Jefferson National Accelerator Facility. The azimuthal angle ($蠁$) dependence of the BSA was studied in a wide range of virtual photon and scattered proton kinematics. The $Q^2$, $x_B$, and t dependencies of the BSA on the bound proton are compared with those on the free proton. In the whole kinematical region of our measurements, the BSA on the bound proton is smaller by 20\% to 40\%, indicating possible medium modification of its partonic structure. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.07628v2-abstract-full').style.display = 'none'; document.getElementById('1812.07628v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 June, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 123, 032502 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1812.02106">arXiv:1812.02106</a> <span> [<a href="https://arxiv.org/pdf/1812.02106">pdf</a>, <a href="https://arxiv.org/format/1812.02106">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.122.162301">10.1103/PhysRevLett.122.162301 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First Measurements of the Double-Polarization Observables $F$, $P$, and $H$ in $蠅$ Photoproduction off Transversely Polarized Protons in the $N^\ast$ Resonance Region </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Roy%2C+P">P. Roy</a>, <a href="/search/nucl-ex?searchtype=author&query=Park%2C+S">S. Park</a>, <a href="/search/nucl-ex?searchtype=author&query=Crede%2C+V">V. Crede</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Wei%2C+N+C">N. C. Wei</a>, <a href="/search/nucl-ex?searchtype=author&query=Huang%2C+F">F. Huang</a>, <a href="/search/nucl-ex?searchtype=author&query=Nakayama%2C+K">K. Nakayama</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Angelini%2C+G">G. Angelini</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brock%2C+J">J. Brock</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V+D">V. D. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+F">F. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Carlin%2C+C">C. Carlin</a> , et al. (123 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1812.02106v2-abstract-short" style="display: inline;"> First measurements of double-polarization observables in $蠅$ photoproduction off the proton are presented using transverse target polarization and data from the CEBAF Large Acceptance Spectrometer (CLAS) FROST experiment at Jefferson Lab. The beam-target asymmetry $F$ has been measured using circularly polarized, tagged photons in the energy range 1200 - 2700 MeV, and the beam-target asymmetries… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.02106v2-abstract-full').style.display = 'inline'; document.getElementById('1812.02106v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1812.02106v2-abstract-full" style="display: none;"> First measurements of double-polarization observables in $蠅$ photoproduction off the proton are presented using transverse target polarization and data from the CEBAF Large Acceptance Spectrometer (CLAS) FROST experiment at Jefferson Lab. The beam-target asymmetry $F$ has been measured using circularly polarized, tagged photons in the energy range 1200 - 2700 MeV, and the beam-target asymmetries $H$ and $P$ have been measured using linearly polarized tagged photons in the energy range 1200 - 2000 MeV. These measurements significantly increase the database on polarization observables. The results are included in two partial-wave analyses and reveal significant contributions from several nucleon ($N^\ast$) resonances. In particular, contributions from new $N^\ast$ resonances listed in the Review of Particle Properties are observed, which aid in reaching the goal of mapping out the nucleon resonance spectrum. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.02106v2-abstract-full').style.display = 'none'; document.getElementById('1812.02106v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Two authors added, figures updated</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-18-2879 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 122, 162301 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1806.01767">arXiv:1806.01767</a> <span> [<a href="https://arxiv.org/pdf/1806.01767">pdf</a>, <a href="https://arxiv.org/format/1806.01767">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2018.10.013">10.1016/j.physletb.2018.10.013 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First results on nucleon resonance photocouplings from the $纬p \to 蟺^+蟺^-p$ reaction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=CLAS+Collaboration"> CLAS Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Golovatch%2C+E">E. Golovatch</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V+D">V. D. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Carman%2C+D+S">D. S. Carman</a>, <a href="/search/nucl-ex?searchtype=author&query=Gothe%2C+R+W">R. W. Gothe</a>, <a href="/search/nucl-ex?searchtype=author&query=Hicks%2C+K">K. Hicks</a>, <a href="/search/nucl-ex?searchtype=author&query=Ishkhanov%2C+B+S">B. S. Ishkhanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Mokeev%2C+V+I">V. I. Mokeev</a>, <a href="/search/nucl-ex?searchtype=author&query=Pasyuk%2C+E">E. Pasyuk</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M+J">M. J. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+J">J. Ball</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Bashkanov%2C+M">M. Bashkanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+F">F. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Celentano%2C+A">A. Celentano</a>, <a href="/search/nucl-ex?searchtype=author&query=Chatagnon%2C+P">P. Chatagnon</a>, <a href="/search/nucl-ex?searchtype=author&query=Chetry%2C+T">T. Chetry</a> , et al. (105 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1806.01767v2-abstract-short" style="display: inline;"> We report the first experimental measurements of the nine 1-fold differential cross sections for the $纬p \to 蟺^+蟺^-p$ reaction, obtained with the CLAS detector at Jefferson Laboratory. The measurements cover the invariant mass range of the final state hadrons from 1.6~GeV~$<W<$~2.0~GeV. For the first time the photocouplings of all prominent nucleon resonances in this mass range have been extracted… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.01767v2-abstract-full').style.display = 'inline'; document.getElementById('1806.01767v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1806.01767v2-abstract-full" style="display: none;"> We report the first experimental measurements of the nine 1-fold differential cross sections for the $纬p \to 蟺^+蟺^-p$ reaction, obtained with the CLAS detector at Jefferson Laboratory. The measurements cover the invariant mass range of the final state hadrons from 1.6~GeV~$<W<$~2.0~GeV. For the first time the photocouplings of all prominent nucleon resonances in this mass range have been extracted from this exclusive channel. Photoproduction of two charged pions is of particular importance for the evaluation of the photocouplings for the $螖(1620)1/2^-$, $螖(1700)3/2^-$, $N(1720)3/2^+$, and $螖(1905)5/2^+$ resonances, which have dominant decays into the $蟺蟺N$ final states rather than the more extensively studied single meson decay channels. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.01767v2-abstract-full').style.display = 'none'; document.getElementById('1806.01767v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 November, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 June, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2018. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1805.04561">arXiv:1805.04561</a> <span> [<a href="https://arxiv.org/pdf/1805.04561">pdf</a>, <a href="https://arxiv.org/format/1805.04561">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.98.045205">10.1103/PhysRevC.98.045205 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Beam-Target Helicity Asymmetry $E$ in $K^{0}螞$ and $K^{0}危^0$ Photoproduction on the Neutron </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=CLAS+Collaboration"> CLAS Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Ho%2C+D+H">D. H. Ho</a>, <a href="/search/nucl-ex?searchtype=author&query=Schumacher%2C+R+A">R. A. Schumacher</a>, <a href="/search/nucl-ex?searchtype=author&query=D%27Angelo%2C+A">A. D'Angelo</a>, <a href="/search/nucl-ex?searchtype=author&query=Deur%2C+A">A. Deur</a>, <a href="/search/nucl-ex?searchtype=author&query=Fleming%2C+J">J. Fleming</a>, <a href="/search/nucl-ex?searchtype=author&query=Hanretty%2C+C">C. Hanretty</a>, <a href="/search/nucl-ex?searchtype=author&query=Kageya%2C+T">T. Kageya</a>, <a href="/search/nucl-ex?searchtype=author&query=Klein%2C+F+J">F. J. Klein</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Lowry%2C+M+M">M. M. Lowry</a>, <a href="/search/nucl-ex?searchtype=author&query=Lu%2C+H">H. Lu</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Peng%2C+P">P. Peng</a>, <a href="/search/nucl-ex?searchtype=author&query=Sandorfi%2C+A+M">A. M. Sandorfi</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Strakovsky%2C+I+I">I. I. Strakovsky</a>, <a href="/search/nucl-ex?searchtype=author&query=Walford%2C+N+K">N. K. Walford</a>, <a href="/search/nucl-ex?searchtype=author&query=Wei%2C+X">X. Wei</a>, <a href="/search/nucl-ex?searchtype=author&query=Workman%2C+R+L">R. L. Workman</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adikaram%2C+D">D. Adikaram</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+J">J. Ball</a> , et al. (124 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1805.04561v2-abstract-short" style="display: inline;"> We report the first measurements of the $E$ beam-target helicity asymmetry for the $\vec纬 \vec{n} \to K^{0}螞$, and $K^{0}危^{0}$ channels in the energy range 1.70$\leq W\leq$2.34 GeV. The CLAS system at Jefferson Lab uses a circularly polarized photon beam and a target consisting of longitudinally polarized solid molecular hydrogen deuteride with low background contamination for the measurements. T… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1805.04561v2-abstract-full').style.display = 'inline'; document.getElementById('1805.04561v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1805.04561v2-abstract-full" style="display: none;"> We report the first measurements of the $E$ beam-target helicity asymmetry for the $\vec纬 \vec{n} \to K^{0}螞$, and $K^{0}危^{0}$ channels in the energy range 1.70$\leq W\leq$2.34 GeV. The CLAS system at Jefferson Lab uses a circularly polarized photon beam and a target consisting of longitudinally polarized solid molecular hydrogen deuteride with low background contamination for the measurements. The multivariate analysis method boosted decision trees was used to isolate the reactions of interest. Comparisons with predictions from the KaonMAID, SAID, and Bonn-Gatchina models are presented. These results will help separate the isospin $I=0$ and $I=1$ photo-coupling transition amplitudes in pseudoscalar meson photoproduction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1805.04561v2-abstract-full').style.display = 'none'; document.getElementById('1805.04561v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 October, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 May, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">14 pages, 9 figures; Revised to match published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 98, 045205 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1802.06746">arXiv:1802.06746</a> <span> [<a href="https://arxiv.org/pdf/1802.06746">pdf</a>, <a href="https://arxiv.org/ps/1802.06746">ps</a>, <a href="https://arxiv.org/format/1802.06746">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2018.06.003">10.1016/j.physletb.2018.06.003 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Differential Cross Section for $纬d \rightarrow 蠅d$ using CLAS at Jefferson Lab </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Chetry%2C+T">T. Chetry</a>, <a href="/search/nucl-ex?searchtype=author&query=Hicks%2C+K">K. Hicks</a>, <a href="/search/nucl-ex?searchtype=author&query=Compton%2C+N">N. Compton</a>, <a href="/search/nucl-ex?searchtype=author&query=Sargsian%2C+M">M. Sargsian</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1802.06746v2-abstract-short" style="display: inline;"> The cross section for coherent $蠅$-meson photoproduction off the deuteron has been measured for the first time as a function of the momentum transfer $t = (P_纬-P_蠅)^2$ and photon energy $E_纬$ using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The cross sections are measured in the energy range $1.4 < E_纬 < 3.4$ GeV. A model based on $蠅-N$ rescattering is consistent with… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.06746v2-abstract-full').style.display = 'inline'; document.getElementById('1802.06746v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1802.06746v2-abstract-full" style="display: none;"> The cross section for coherent $蠅$-meson photoproduction off the deuteron has been measured for the first time as a function of the momentum transfer $t = (P_纬-P_蠅)^2$ and photon energy $E_纬$ using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The cross sections are measured in the energy range $1.4 < E_纬 < 3.4$ GeV. A model based on $蠅-N$ rescattering is consistent with the data at low and intermediate momentum transfer, $|t|$. For $2.8 < E_纬 < 3.4$ GeV, the total cross-section of $蠅-N$ scattering, based on fits within the framework of the Vector Meson Dominance model, is in the range of 30-40 mb. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.06746v2-abstract-full').style.display = 'none'; document.getElementById('1802.06746v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 April, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 5 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1712.10314">arXiv:1712.10314</a> <span> [<a href="https://arxiv.org/pdf/1712.10314">pdf</a>, <a href="https://arxiv.org/format/1712.10314">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.98.015207">10.1103/PhysRevC.98.015207 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Exclusive photoproduction of $蟺^0$ up to large values of Mandelstam variables $s, t$ and $u$ with CLAS </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Kunkel%2C+M+C">M. C. Kunkel</a>, <a href="/search/nucl-ex?searchtype=author&query=32"> 32</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+1+M+J">18 M. J. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=32"> 32</a>, <a href="/search/nucl-ex?searchtype=author&query=Strakovsky%2C+I+I">I. I. Strakovsky</a>, <a href="/search/nucl-ex?searchtype=author&query=Ritman%2C+1+J">16 J. Ritman</a>, <a href="/search/nucl-ex?searchtype=author&query=3"> 3</a>, <a href="/search/nucl-ex?searchtype=author&query=Goldstein%2C+1+G+R">18 G. R. Goldstein</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+4+K+P">43 K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+2+S">28 S Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+1+H">13 H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+3+J">39 J. Ball</a>, <a href="/search/nucl-ex?searchtype=author&query=Balossino%2C+7+I">7 I. Balossino</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+1+L">19 L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+1+M">19 M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Batourine%2C+2+V">21 V. Batourine</a>, <a href="/search/nucl-ex?searchtype=author&query=39"> 39</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+2+I">27 I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+2+A+S">25 A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=11"> 11</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+5+S">5 S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+3+W+J">39 W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+1+W+K">16 W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=40"> 40</a>, <a href="/search/nucl-ex?searchtype=author&query=Bueltmann%2C+3+S">39 S. Bueltmann</a> , et al. (147 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1712.10314v1-abstract-short" style="display: inline;"> Exclusive photoproduction cross sections have been measured for the process $纬p \rightarrow p蟺^0(e^+e^-(纬))$ with the Dalitz decay final state using tagged photon energies in the range of $E_纬 = 1.275-5.425$ GeV. The complete angular distribution of the final state $蟺^0$, for the entire photon energy range up to large values of $t$ and $u$, has been measured for the first time. The data obtained s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.10314v1-abstract-full').style.display = 'inline'; document.getElementById('1712.10314v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1712.10314v1-abstract-full" style="display: none;"> Exclusive photoproduction cross sections have been measured for the process $纬p \rightarrow p蟺^0(e^+e^-(纬))$ with the Dalitz decay final state using tagged photon energies in the range of $E_纬 = 1.275-5.425$ GeV. The complete angular distribution of the final state $蟺^0$, for the entire photon energy range up to large values of $t$ and $u$, has been measured for the first time. The data obtained show that the cross section $d蟽/dt$, at mid to large angles, decreases with energy as $s^{-6.89\pm 0.26} $. This is in agreement with the perturbative QCD quark counting rule prediction of $s^{-7} $. Paradoxically, the size of angular distribution of measured cross sections is greatly underestimated by the QCD based Generalized Parton Distribution mechanism at highest available invariant energy $s=11$ GeV$^2$. At the same time, the Regge exchange based models for $蟺^0$ photoproduction are more consistent with experimental data. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.10314v1-abstract-full').style.display = 'none'; document.getElementById('1712.10314v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 December, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 98, 015207 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1712.02184">arXiv:1712.02184</a> <span> [<a href="https://arxiv.org/pdf/1712.02184">pdf</a>, <a href="https://arxiv.org/ps/1712.02184">ps</a>, <a href="https://arxiv.org/format/1712.02184">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.97.025203">10.1103/PhysRevC.97.025203 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Double $K_S^0$ Photoproduction off the Proton at CLAS </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Chandavar%2C+S">S. Chandavar</a>, <a href="/search/nucl-ex?searchtype=author&query=Goetz%2C+J+T">J. T. Goetz</a>, <a href="/search/nucl-ex?searchtype=author&query=Hicks%2C+K">K. Hicks</a>, <a href="/search/nucl-ex?searchtype=author&query=Keller%2C+D">D. Keller</a>, <a href="/search/nucl-ex?searchtype=author&query=Kunkel%2C+M+C">M. C. Kunkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Paolone%2C+M">M. Paolone</a>, <a href="/search/nucl-ex?searchtype=author&query=Weygand%2C+D+P">D. P. Weygand</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+J">J. Ball</a>, <a href="/search/nucl-ex?searchtype=author&query=Balossino%2C+I">I. Balossino</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Bashkanov%2C+M">M. Bashkanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V+D">V. D. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+F">F. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Carman%2C+D+S">D. S. Carman</a>, <a href="/search/nucl-ex?searchtype=author&query=Celentano%2C+A">A. Celentano</a>, <a href="/search/nucl-ex?searchtype=author&query=Charles%2C+G">G. Charles</a>, <a href="/search/nucl-ex?searchtype=author&query=Chetry%2C+T">T. Chetry</a> , et al. (102 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1712.02184v1-abstract-short" style="display: inline;"> The $f_0$(1500) meson resonance is one of several contenders to have significant mixing with the lightest glueball. This resonance is well established from several previous experiments. Here we present the first photoproduction data for the $f_0$(1500) via decay into the $K_S^0 K_S^0$ channel using the CLAS detector. The reaction $纬p$ -> $f_0 p$ -> $K_S^0 K_S^0 p$, where J = 0, 2, was measured wit… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.02184v1-abstract-full').style.display = 'inline'; document.getElementById('1712.02184v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1712.02184v1-abstract-full" style="display: none;"> The $f_0$(1500) meson resonance is one of several contenders to have significant mixing with the lightest glueball. This resonance is well established from several previous experiments. Here we present the first photoproduction data for the $f_0$(1500) via decay into the $K_S^0 K_S^0$ channel using the CLAS detector. The reaction $纬p$ -> $f_0 p$ -> $K_S^0 K_S^0 p$, where J = 0, 2, was measured with photon energies from 2.7 to 5.1 GeV. A clear peak is seen at 1500 MeV in the background subtracted invariant mass spectra of the two kaons. This is enhanced if the measured 4-momentum transfer to the proton target is restricted to be less than 1.0 GeV2. By comparing data with simulations, it can be concluded that the peak at 1500 MeV is produced primarily at low t, which is consistent with a t-channel production mechanism. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.02184v1-abstract-full').style.display = 'none'; document.getElementById('1712.02184v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 December, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 12 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 97, 025203 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1711.05176">arXiv:1711.05176</a> <span> [<a href="https://arxiv.org/pdf/1711.05176">pdf</a>, <a href="https://arxiv.org/format/1711.05176">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.97.055202">10.1103/PhysRevC.97.055202 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the beam asymmetry $危$ and the target asymmetry $T$ in the photoproduction of $蠅$ mesons off the proton using CLAS at Jefferson Laboratory </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Roy%2C+P">P. Roy</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Park%2C+S">S. Park</a>, <a href="/search/nucl-ex?searchtype=author&query=Crede%2C+V">V. Crede</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Denisenko%2C+I">I. Denisenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Pereira%2C+S+A">S. Anefalos Pereira</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+J">J. Ball</a>, <a href="/search/nucl-ex?searchtype=author&query=Balossino%2C+I">I. Balossino</a>, <a href="/search/nucl-ex?searchtype=author&query=Bashkanov%2C+M">M. Bashkanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Batourine%2C+V">V. Batourine</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brock%2C+J">J. Brock</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V+D">V. D. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Carlin%2C+C">C. Carlin</a> , et al. (121 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1711.05176v3-abstract-short" style="display: inline;"> The photoproduction of $蠅$ mesons off the proton has been studied in the reaction $纬p\to p\,蠅$ using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target (FROST) in Hall B at the Thomas Jefferson National Accelerator Facility. For the first time, the target asymmetry, $T$, has been measured in photoproduction from the decay $蠅\to蟺^+蟺^-蟺^0$, using a transversely-polarized targe… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.05176v3-abstract-full').style.display = 'inline'; document.getElementById('1711.05176v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.05176v3-abstract-full" style="display: none;"> The photoproduction of $蠅$ mesons off the proton has been studied in the reaction $纬p\to p\,蠅$ using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target (FROST) in Hall B at the Thomas Jefferson National Accelerator Facility. For the first time, the target asymmetry, $T$, has been measured in photoproduction from the decay $蠅\to蟺^+蟺^-蟺^0$, using a transversely-polarized target with energies ranging from just above the reaction threshold up to 2.8 GeV. Significant non-zero values are observed for these asymmetries, reaching about 30-40% in the third-resonance region. New measurements for the photon-beam asymmetry, $危$, are also presented, which agree well with previous CLAS results and extend the world database up to 2.1 GeV. These data and additional $蠅$-photoproduction observables from CLAS were included in a partial-wave analysis within the Bonn-Gatchina framework. Significant contributions from $s$-channel resonance production were found in addition to $t$-channel exchange processes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.05176v3-abstract-full').style.display = 'none'; document.getElementById('1711.05176v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 May, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, 10 figures, author list and references updated</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-17-2583 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 97, 055202 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1711.01974">arXiv:1711.01974</a> <span> [<a href="https://arxiv.org/pdf/1711.01974">pdf</a>, <a href="https://arxiv.org/format/1711.01974">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.120.062501">10.1103/PhysRevLett.120.062501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the Q^2 Dependence of the Deuteron Spin Structure Function g_1 and its Moments at Low Q^2 with CLAS </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Deur%2C+A">A. Deur</a>, <a href="/search/nucl-ex?searchtype=author&query=Fassi%2C+L+E">L. El Fassi</a>, <a href="/search/nucl-ex?searchtype=author&query=Kang%2C+H">H. Kang</a>, <a href="/search/nucl-ex?searchtype=author&query=Kuhn%2C+S+E">S. E. Kuhn</a>, <a href="/search/nucl-ex?searchtype=author&query=Ripani%2C+M">M. Ripani</a>, <a href="/search/nucl-ex?searchtype=author&query=Slifer%2C+K">K. Slifer</a>, <a href="/search/nucl-ex?searchtype=author&query=Zheng%2C+X">X. Zheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M+J">M. J. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+J">J. Ball</a>, <a href="/search/nucl-ex?searchtype=author&query=Balossino%2C+I">I. Balossino</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosted%2C+P">P. Bosted</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brock%2C+J">J. Brock</a>, <a href="/search/nucl-ex?searchtype=author&query=Bueltmann%2C+S">S. Bueltmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V+D">V. D. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+F+T">F. Thanh Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Carlin%2C+C">C. Carlin</a> , et al. (123 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1711.01974v4-abstract-short" style="display: inline;"> We measured the $g_1$ spin structure function of the deuteron at low $Q^{2}$, where QCD can be approximated with chiral perturbation theory ($蠂$PT). The data cover the resonance region, up to an invariant mass of $W\approx1.9$~GeV. The generalized Gerasimov-Drell-Hearn sum, the moment $\bar螕_{1}^{d}$ and the integral $\bar{I}_纬^d$ related to the spin polarizability $纬_{0}^{d}$ are precisely determ… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.01974v4-abstract-full').style.display = 'inline'; document.getElementById('1711.01974v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.01974v4-abstract-full" style="display: none;"> We measured the $g_1$ spin structure function of the deuteron at low $Q^{2}$, where QCD can be approximated with chiral perturbation theory ($蠂$PT). The data cover the resonance region, up to an invariant mass of $W\approx1.9$~GeV. The generalized Gerasimov-Drell-Hearn sum, the moment $\bar螕_{1}^{d}$ and the integral $\bar{I}_纬^d$ related to the spin polarizability $纬_{0}^{d}$ are precisely determined down to a minimum $Q^2$ of 0.02~GeV$^2$ for the first time, about 2.5 times lower than that of previous data. We compare them to several $蠂$PT calculations and models. These results are the first in a program of benchmark measurements of polarization observables in the $蠂$PT domain. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.01974v4-abstract-full').style.display = 'none'; document.getElementById('1711.01974v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Version 1: version published in Phys. Rev. Lett. 6 pages, 3 figures. Supplementary material: data table for g1d and its moments (10 pages) V2: Figures labels changed and text slightly modified to clarify the exact nature of the measured moments V3: Corrected a typo page 5 for the theoretical value expected for deuteron GDH sum rule (agreement between measurement and expectation is improved)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-17-2585 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 120, 062501 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1709.10054">arXiv:1709.10054</a> <span> [<a href="https://arxiv.org/pdf/1709.10054">pdf</a>, <a href="https://arxiv.org/ps/1709.10054">ps</a>, <a href="https://arxiv.org/format/1709.10054">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2018.06.014">10.1016/j.physletb.2018.06.014 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Semi-Inclusive $蟺_0$ target and beam-target asymmetries from 6 GeV electron scattering with CLAS </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Jawalkar%2C+S">S. Jawalkar</a>, <a href="/search/nucl-ex?searchtype=author&query=Koirala%2C+S">S. Koirala</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosted%2C+P">P. Bosted</a>, <a href="/search/nucl-ex?searchtype=author&query=Griffioen%2C+K+A">K. A. Griffioen</a>, <a href="/search/nucl-ex?searchtype=author&query=Keith%2C+C">C. Keith</a>, <a href="/search/nucl-ex?searchtype=author&query=Kuhn%2C+S+E">S. E. Kuhn</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adikaram%2C+D">D. Adikaram</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M+J">M. J. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Pereira%2C+S+A">S. Anefalos Pereira</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+J">J. Ball</a>, <a href="/search/nucl-ex?searchtype=author&query=Baltzell%2C+N+A">N. A. Baltzell</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Batourine%2C+V">V. Batourine</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brock%2C+J">J. Brock</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Bultmann%2C+S">S. Bultmann</a> , et al. (139 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1709.10054v2-abstract-short" style="display: inline;"> We present precision measurements of the target and beam-target spin asymmetries from neutral pion electroproduction in deep-inelastic scattering (DIS) using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. We scattered 6-GeV, longitudinally polarized electrons off longitudinally polarized protons in a cryogenic $^{14}$NH$_3$ target, and extracted double and single target spin asym… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1709.10054v2-abstract-full').style.display = 'inline'; document.getElementById('1709.10054v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1709.10054v2-abstract-full" style="display: none;"> We present precision measurements of the target and beam-target spin asymmetries from neutral pion electroproduction in deep-inelastic scattering (DIS) using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. We scattered 6-GeV, longitudinally polarized electrons off longitudinally polarized protons in a cryogenic $^{14}$NH$_3$ target, and extracted double and single target spin asymmetries for $ep\rightarrow e^\prime蟺^0X$ in multidimensional bins in four-momentum transfer ($1.0<Q^2<3.2$ GeV$^2$), Bjorken-$x$ ($0.12<x<0.48$), hadron energy fraction ($0.4<z<0.7$), transverse pion momentum ($0<P_T<1.0$ GeV), and azimuthal angle $蠁_h$ between the lepton scattering and hadron production planes. We extracted asymmetries as a function of both $x$ and $P_T$, which provide access to transverse-momentum distributions of longitudinally polarized quarks. The double spin asymmetries depend weakly on $P_T$. The $\sin 2蠁_h$ moments are zero within uncertainties, which is consistent with the expected suppression of the Collins fragmentation function. The observed $\sin蠁_h$ moments suggest that quark gluon correlations are significant at large $x$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1709.10054v2-abstract-full').style.display = 'none'; document.getElementById('1709.10054v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 April, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 September, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">18 preprint pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1708.02608">arXiv:1708.02608</a> <span> [<a href="https://arxiv.org/pdf/1708.02608">pdf</a>, <a href="https://arxiv.org/format/1708.02608">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.96.065209">10.1103/PhysRevC.96.065209 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the helicity asymmetry $E$ in $蠅\to蟺^+蟺^-蟺^0$ photoproduction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Roy%2C+P">P. Roy</a>, <a href="/search/nucl-ex?searchtype=author&query=Park%2C+S">S. Park</a>, <a href="/search/nucl-ex?searchtype=author&query=Crede%2C+V">V. Crede</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Denisenko%2C+I">I. Denisenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M+J">M. J. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Pereira%2C+S+A">S. Anefalos Pereira</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+J">J. Ball</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Batourine%2C+V">V. Batourine</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brock%2C+J">J. Brock</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V+D">V. D. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+F+T">F. T. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Carlin%2C+C">C. Carlin</a> , et al. (109 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1708.02608v2-abstract-short" style="display: inline;"> The double-polarization observable $E$ was studied for the reaction $纬p\to p蠅$ using the CEBAF Large Acceptance Spectrometer (CLAS) in Hall B at the Thomas Jefferson National Accelerator Facility and the longitudinally-polarized frozen-spin target (FROST). The observable was measured from the charged decay mode of the meson, $蠅\to蟺^+蟺^-蟺^0$, using a circularly-polarized tagged-photon beam with ene… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1708.02608v2-abstract-full').style.display = 'inline'; document.getElementById('1708.02608v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1708.02608v2-abstract-full" style="display: none;"> The double-polarization observable $E$ was studied for the reaction $纬p\to p蠅$ using the CEBAF Large Acceptance Spectrometer (CLAS) in Hall B at the Thomas Jefferson National Accelerator Facility and the longitudinally-polarized frozen-spin target (FROST). The observable was measured from the charged decay mode of the meson, $蠅\to蟺^+蟺^-蟺^0$, using a circularly-polarized tagged-photon beam with energies ranging from the $蠅$ threshold at 1.1 to 2.3 GeV. A partial-wave analysis within the Bonn-Gatchina framework found dominant contributions from the $3/2^+$ partial wave near threshold, which is identified with the sub-threshold $N(1720)\,3/2^+$ nucleon resonance. To describe the entire data set, which consisted of $蠅$ differential cross sections and a large variety of polarization observables, further contributions from other nucleon resonances were found to be necessary. With respect to non-resonant mechanisms, $蟺$ exchange in the $t$-channel was found to remain small across the analyzed energy range, while pomeron $t$-channel exchange gradually grew from the reaction threshold to dominate all other contributions above $W \approx 2$ GeV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1708.02608v2-abstract-full').style.display = 'none'; document.getElementById('1708.02608v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 January, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 August, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 8 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-17-2532 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 96, 065209 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1707.03361">arXiv:1707.03361</a> <span> [<a href="https://arxiv.org/pdf/1707.03361">pdf</a>, <a href="https://arxiv.org/format/1707.03361">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.119.202004">10.1103/PhysRevLett.119.202004 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First Exclusive Measurement of Deeply Virtual Compton Scattering off $^4$He: Toward the 3D Tomography of Nuclei </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Hattawy%2C+M">M. Hattawy</a>, <a href="/search/nucl-ex?searchtype=author&query=Baltzell%2C+N+A">N. A. Baltzell</a>, <a href="/search/nucl-ex?searchtype=author&query=Dupr%C3%A9%2C+R">R. Dupr茅</a>, <a href="/search/nucl-ex?searchtype=author&query=Hafidi%2C+K">K. Hafidi</a>, <a href="/search/nucl-ex?searchtype=author&query=Stepanyan%2C+S">S. Stepanyan</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%BCltmann%2C+S">S. B眉ltmann</a>, <a href="/search/nucl-ex?searchtype=author&query=De+Vita%2C+R">R. De Vita</a>, <a href="/search/nucl-ex?searchtype=author&query=Alaoui%2C+A+E">A. El Alaoui</a>, <a href="/search/nucl-ex?searchtype=author&query=Fassi%2C+L+E">L. El Fassi</a>, <a href="/search/nucl-ex?searchtype=author&query=Egiyan%2C+H">H. Egiyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Girod%2C+F+X">F. X. Girod</a>, <a href="/search/nucl-ex?searchtype=author&query=Guidal%2C+M">M. Guidal</a>, <a href="/search/nucl-ex?searchtype=author&query=Jenkins%2C+D">D. Jenkins</a>, <a href="/search/nucl-ex?searchtype=author&query=Liuti%2C+S">S. Liuti</a>, <a href="/search/nucl-ex?searchtype=author&query=Perrin%2C+Y">Y. Perrin</a>, <a href="/search/nucl-ex?searchtype=author&query=Torayev%2C+B">B. Torayev</a>, <a href="/search/nucl-ex?searchtype=author&query=Voutier%2C+E">E. Voutier</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adikaram%2C+D">D. Adikaram</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M+J">M. J. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Pereira%2C+S+A">S. Anefalos Pereira</a>, <a href="/search/nucl-ex?searchtype=author&query=Armstrong%2C+W+R">Whitney R. Armstrong</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a> , et al. (135 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1707.03361v1-abstract-short" style="display: inline;"> We report on the first measurement of the beam-spin asymmetry in the exclusive process of coherent deeply virtual Compton scattering off a nucleus. The experiment used the 6 GeV electron beam from the CEBAF accelerator at Jefferson Lab incident on a pressurized $^4$He gaseous target placed in front of the CEBAF Large Acceptance Spectrometer (CLAS). The scattered electron was detected by CLAS and t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1707.03361v1-abstract-full').style.display = 'inline'; document.getElementById('1707.03361v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1707.03361v1-abstract-full" style="display: none;"> We report on the first measurement of the beam-spin asymmetry in the exclusive process of coherent deeply virtual Compton scattering off a nucleus. The experiment used the 6 GeV electron beam from the CEBAF accelerator at Jefferson Lab incident on a pressurized $^4$He gaseous target placed in front of the CEBAF Large Acceptance Spectrometer (CLAS). The scattered electron was detected by CLAS and the photon by a dedicated electromagnetic calorimeter at forward angles. To ensure the exclusivity of the process, a specially designed radial time projection chamber was used to detect the recoiling $^4$He nuclei. We measured beam-spin asymmetries larger than those observed on the free proton in the same kinematic domain. From these, we were able to extract, in a model-independent way, the real and imaginary parts of the only $^4$He Compton form factor, $\cal H_A$. This first measurement of coherent deeply virtual Compton scattering on the $^4$He nucleus, with a fully exclusive final state via nuclear recoil tagging, leads the way toward 3D imaging of the partonic structure of nuclei. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1707.03361v1-abstract-full').style.display = 'none'; document.getElementById('1707.03361v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 July, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 119, 202004 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1706.04280">arXiv:1706.04280</a> <span> [<a href="https://arxiv.org/pdf/1706.04280">pdf</a>, <a href="https://arxiv.org/format/1706.04280">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2017.08.015">10.1016/j.physletb.2017.08.015 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Photon beam asymmetry $危$ in the reaction $\vec纬 p \to p 蠅$ for $E_纬$ = 1.152 to 1.876 GeV </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=CLAS+Collaboration"> CLAS Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Collins%2C+P">P. Collins</a>, <a href="/search/nucl-ex?searchtype=author&query=Ritchie%2C+B+G">B. G. Ritchie</a>, <a href="/search/nucl-ex?searchtype=author&query=Dugger%2C+M">M. Dugger</a>, <a href="/search/nucl-ex?searchtype=author&query=Klein%2C+F+J">F. J. Klein</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A">A. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adikaram%2C+D">D. Adikaram</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Pereira%2C+S+A">S. Anefalos Pereira</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+J">J. Ball</a>, <a href="/search/nucl-ex?searchtype=author&query=Baltzell%2C+N+A">N. A. Baltzell</a>, <a href="/search/nucl-ex?searchtype=author&query=Bashkanov%2C+M">M. Bashkanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Batourine%2C+V">V. Batourine</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a> , et al. (125 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1706.04280v1-abstract-short" style="display: inline;"> Photon beam asymmetry $危$ measurements for $蠅$ photoproduction in the reaction $\vec纬 p \to 蠅p$ are reported for photon energies from 1.152 to 1.876 GeV. Data were taken using a linearly-polarized tagged photon beam, a cryogenic hydrogen target, and the CLAS spectrometer in Hall B at Jefferson Lab. The measurements obtained markedly increase the size of the database for this observable, extend cov… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.04280v1-abstract-full').style.display = 'inline'; document.getElementById('1706.04280v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1706.04280v1-abstract-full" style="display: none;"> Photon beam asymmetry $危$ measurements for $蠅$ photoproduction in the reaction $\vec纬 p \to 蠅p$ are reported for photon energies from 1.152 to 1.876 GeV. Data were taken using a linearly-polarized tagged photon beam, a cryogenic hydrogen target, and the CLAS spectrometer in Hall B at Jefferson Lab. The measurements obtained markedly increase the size of the database for this observable, extend coverage to higher energies, and resolve discrepancies in previously published data. Comparisons of these new results with predictions from a chiral-quark-based model and from a dynamical coupled-channels model indicate the importance of interferences between $t$-channel meson exchange and $s$- and $u$-channel contributions, underscoring sensitivity to the nucleon resonances included in those descriptions. Comparisons with the Bonn-Gatchina partial-wave analysis indicate the $危$ data reported here help to fix the magnitudes of the interference terms between the leading amplitudes in that calculation (Pomeron exchange and the resonant portion of the $J^P=3/2^+$ partial wave), as well as the resonant portions of the smaller partial waves with $J^P$= $1/2^-$, $3/2^-$, and $5/2^+$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.04280v1-abstract-full').style.display = 'none'; document.getElementById('1706.04280v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 June, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1706.01963">arXiv:1706.01963</a> <span> [<a href="https://arxiv.org/pdf/1706.01963">pdf</a>, <a href="https://arxiv.org/ps/1706.01963">ps</a>, <a href="https://arxiv.org/format/1706.01963">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.96.035204">10.1103/PhysRevC.96.035204 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Differential Cross Section Measurements for $纬n\to蟺^-p$ Above the First Nucleon Resonance Region </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Mattione%2C+P+T">P. T. Mattione</a>, <a href="/search/nucl-ex?searchtype=author&query=Carman%2C+D+S">D. S. Carman</a>, <a href="/search/nucl-ex?searchtype=author&query=Strakovsky%2C+I+I">I. I. Strakovsky</a>, <a href="/search/nucl-ex?searchtype=author&query=Workman%2C+R+L">R. L. Workman</a>, <a href="/search/nucl-ex?searchtype=author&query=Kudryavtsev%2C+A+E">A. E. Kudryavtsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Svarc%2C+A">A. Svarc</a>, <a href="/search/nucl-ex?searchtype=author&query=Tarasov%2C+V+E">V. E. Tarasov</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adikaram%2C+D">D. Adikaram</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Pereira%2C+S+A">S. Anefalos Pereira</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+J">J. Ball</a>, <a href="/search/nucl-ex?searchtype=author&query=Baltzell%2C+N+A">N. A. Baltzell</a>, <a href="/search/nucl-ex?searchtype=author&query=Bashkanov%2C+M">M. Bashkanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Batourine%2C+V">V. Batourine</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V+D">V. D. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+T">T. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Celentano%2C+A">A. Celentano</a>, <a href="/search/nucl-ex?searchtype=author&query=Charles%2C+G">G. Charles</a> , et al. (123 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1706.01963v3-abstract-short" style="display: inline;"> The quasi-free $纬d\to蟺^{-}p(p)$ differential cross section has been measured with CLAS at photon beam energies $E_纬$ from 0.445 GeV to 2.510 GeV (corresponding to $W$ from 1.311 GeV to 2.366 GeV) for pion center-of-mass angles $\cos胃_蟺^{c.m.}$ from -0.72 to 0.92. A correction for final state interactions has been applied to this data to extract the $纬n\to蟺^-p$ differential cross sections. These cr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.01963v3-abstract-full').style.display = 'inline'; document.getElementById('1706.01963v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1706.01963v3-abstract-full" style="display: none;"> The quasi-free $纬d\to蟺^{-}p(p)$ differential cross section has been measured with CLAS at photon beam energies $E_纬$ from 0.445 GeV to 2.510 GeV (corresponding to $W$ from 1.311 GeV to 2.366 GeV) for pion center-of-mass angles $\cos胃_蟺^{c.m.}$ from -0.72 to 0.92. A correction for final state interactions has been applied to this data to extract the $纬n\to蟺^-p$ differential cross sections. These cross sections are quoted in 8428 $(E_纬,\cos胃_蟺^{c.m.})$ bins, a factor of nearly three increase in the world statistics for this channel in this kinematic range. These new data help to constrain coupled-channel analysis fits used to disentangle the spectrum of $N^*$ resonances and extract their properties. Selected photon decay amplitudes $N^* \to 纬n$ at the resonance poles are determined for the first time and are reported here. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.01963v3-abstract-full').style.display = 'none'; document.getElementById('1706.01963v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 August, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 June, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-17-2478 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 96, 035204 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1705.04713">arXiv:1705.04713</a> <span> [<a href="https://arxiv.org/pdf/1705.04713">pdf</a>, <a href="https://arxiv.org/format/1705.04713">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> The Beam-Target Helicity Asymmetry for $\vec纬 \vec{n} \rightarrow 蟺^- p$ in the {\bf{$N^*$} Resonance Region </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Ho%2C+D">D. Ho</a>, <a href="/search/nucl-ex?searchtype=author&query=Peng%2C+P">P. Peng</a>, <a href="/search/nucl-ex?searchtype=author&query=Bass%2C+C">C. Bass</a>, <a href="/search/nucl-ex?searchtype=author&query=Collins%2C+P">P. Collins</a>, <a href="/search/nucl-ex?searchtype=author&query=D%27Angelo%2C+A">A. D'Angelo</a>, <a href="/search/nucl-ex?searchtype=author&query=Deur%2C+A">A. Deur</a>, <a href="/search/nucl-ex?searchtype=author&query=Fleming%2C+J">J. Fleming</a>, <a href="/search/nucl-ex?searchtype=author&query=Hanretty%2C+C">C. Hanretty</a>, <a href="/search/nucl-ex?searchtype=author&query=Kageya%2C+T">T. Kageya</a>, <a href="/search/nucl-ex?searchtype=author&query=Khandaker%2C+M">M. Khandaker</a>, <a href="/search/nucl-ex?searchtype=author&query=Klein%2C+F+J">F. J. Klein</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Laine%2C+V">V. Laine</a>, <a href="/search/nucl-ex?searchtype=author&query=Lowry%2C+M+M">M. M. Lowry</a>, <a href="/search/nucl-ex?searchtype=author&query=Lu%2C+H">H. Lu</a>, <a href="/search/nucl-ex?searchtype=author&query=Nepali%2C+C">C. Nepali</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=O%27Connell%2C+T">T. O'Connell</a>, <a href="/search/nucl-ex?searchtype=author&query=Sandorfi%2C+A+M">A. M. Sandorfi</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Schumacher%2C+R+A">R. A. Schumacher</a>, <a href="/search/nucl-ex?searchtype=author&query=Strakovsky%2C+I+I">I. I. Strakovsky</a>, <a href="/search/nucl-ex?searchtype=author&query=%C5%A0varc%2C+A">A. 艩varc</a>, <a href="/search/nucl-ex?searchtype=author&query=Walford%2C+N+K">N. K. Walford</a>, <a href="/search/nucl-ex?searchtype=author&query=Wei%2C+X">X. Wei</a> , et al. (118 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1705.04713v1-abstract-short" style="display: inline;"> We report the first beam-target double-polarization asymmetries in the $纬+ n(p) \rightarrow 蟺^- + p(p)$ reaction spanning the nucleon resonance region from invariant mass $W$= $1500$ to $2300$ MeV. Circularly polarized photons and longitudinally polarized deuterons in $H\!D$ have been used with the CLAS detector at Jefferson Lab. The exclusive final state has been extracted using three very differ… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1705.04713v1-abstract-full').style.display = 'inline'; document.getElementById('1705.04713v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1705.04713v1-abstract-full" style="display: none;"> We report the first beam-target double-polarization asymmetries in the $纬+ n(p) \rightarrow 蟺^- + p(p)$ reaction spanning the nucleon resonance region from invariant mass $W$= $1500$ to $2300$ MeV. Circularly polarized photons and longitudinally polarized deuterons in $H\!D$ have been used with the CLAS detector at Jefferson Lab. The exclusive final state has been extracted using three very different analyses that show excellent agreement, and these have been used to deduce the {\it{E}} polarization observable for an effective neutron target. These results have been incorporated into new partial wave analyses, and have led to significant revisions for several $纬nN^*$ resonance photo-couplings. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1705.04713v1-abstract-full').style.display = 'none'; document.getElementById('1705.04713v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 May, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 5 figures; Physical Review Letters - in press</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLab-PHY-17-2438 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1703.00433">arXiv:1703.00433</a> <span> [<a href="https://arxiv.org/pdf/1703.00433">pdf</a>, <a href="https://arxiv.org/format/1703.00433">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2017.05.045">10.1016/j.physletb.2017.05.045 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Photon beam asymmetry $危$ for $畏$ and $畏^\prime$ photoproduction from the proton </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Collins%2C+P">P. Collins</a>, <a href="/search/nucl-ex?searchtype=author&query=Ritchie%2C+B+G">B. G. Ritchie</a>, <a href="/search/nucl-ex?searchtype=author&query=Dugger%2C+M">M. Dugger</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=D%C3%B6ring%2C+M">M. D枚ring</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=R%C3%B6nchen%2C+D">D. R枚nchen</a>, <a href="/search/nucl-ex?searchtype=author&query=Sadasivan%2C+D">D. Sadasivan</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A">A. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikaria%2C+K+P">K. P. Adhikaria</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryana%2C+M+J">M. J. Amaryana</a>, <a href="/search/nucl-ex?searchtype=author&query=Pereira%2C+S+A">S. Anefalos Pereira</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakiana%2C+H">H. Avakiana</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+J">J. Ball</a>, <a href="/search/nucl-ex?searchtype=author&query=Balossino%2C+I">I. Balossino</a>, <a href="/search/nucl-ex?searchtype=author&query=Bashkanova%2C+M">M. Bashkanova</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Bisellik%2C+A+S">A. S. Bisellik</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V+D">V. D. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+F+T">Frank Thanh Cao</a> , et al. (118 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1703.00433v1-abstract-short" style="display: inline;"> Measurements of the linearly-polarized photon beam asymmetry $危$ for photoproduction from the proton of $畏$ and $畏^\prime$ mesons are reported. A linearly-polarized tagged photon beam produced by coherent bremsstrahlung was incident on a cryogenic hydrogen target within the CEBAF Large Acceptance Spectrometer. Results are presented for the $纬p \to 畏p$ reaction for incident photon energies from 1.0… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.00433v1-abstract-full').style.display = 'inline'; document.getElementById('1703.00433v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1703.00433v1-abstract-full" style="display: none;"> Measurements of the linearly-polarized photon beam asymmetry $危$ for photoproduction from the proton of $畏$ and $畏^\prime$ mesons are reported. A linearly-polarized tagged photon beam produced by coherent bremsstrahlung was incident on a cryogenic hydrogen target within the CEBAF Large Acceptance Spectrometer. Results are presented for the $纬p \to 畏p$ reaction for incident photon energies from 1.070 to 1.876 GeV, and from 1.516 to 1.836 GeV for the $纬p \to 畏^\prime p$ reaction. For $纬p \to 畏p$, the data reported here considerably extend the range of measurements to higher energies, and are consistent with the few previously published measurements for this observable near threshold. For $纬p \to 畏^\prime p$, the results obtained are consistent with the few previously published measurements for this observable near threshold, but also greatly expand the incident photon energy coverage for that reaction. Initial analysis of the data reported here with the Bonn-Gatchina model strengthens the evidence for four nucleon resonances -- the $N(1895)1/2^-$, $N(1900)3/2^+$, $N(2100)1/2^+$ and $N(2120)3/2^-$ resonances -- which presently lack the "four-star" status in the current Particle Data Group compilation, providing examples of how these new measurements help refine models of the photoproduction process. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.00433v1-abstract-full').style.display = 'none'; document.getElementById('1703.00433v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 March, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1611.04987">arXiv:1611.04987</a> <span> [<a href="https://arxiv.org/pdf/1611.04987">pdf</a>, <a href="https://arxiv.org/ps/1611.04987">ps</a>, <a href="https://arxiv.org/format/1611.04987">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.95.035207">10.1103/PhysRevC.95.035207 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Target and beam-target spin asymmetries in exclusive pion electroproduction for $Q^2>1$ GeV$^2$. II. $e p \rightarrow e 蟺^0 p$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Bosted%2C+P+E">P. E. Bosted</a>, <a href="/search/nucl-ex?searchtype=author&query=Kim%2C+A">A. Kim</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adikaram%2C+D">D. Adikaram</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M+J">M. J. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Pereira%2C+S+A">S. Anefalos Pereira</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Badui%2C+R+A">R. A. Badui</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+J">J. Ball</a>, <a href="/search/nucl-ex?searchtype=author&query=Balossino%2C+I">I. Balossino</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%BCltmann%2C+S">S. B眉ltmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V+D">V. D. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+T">T. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Carman%2C+D+S">D. S. Carman</a>, <a href="/search/nucl-ex?searchtype=author&query=Celentano%2C+A">A. Celentano</a>, <a href="/search/nucl-ex?searchtype=author&query=Chandavar%2C+S">S. Chandavar</a>, <a href="/search/nucl-ex?searchtype=author&query=Charles%2C+G">G. Charles</a>, <a href="/search/nucl-ex?searchtype=author&query=Chetry%2C+T">T. Chetry</a> , et al. (131 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1611.04987v1-abstract-short" style="display: inline;"> Beam-target double-spin asymmetries and target single-spin asymmetries were measured for the exclusive $蟺^0$ electroproduction reaction $纬^* p \to p 蟺^0$, expanding an analysis of the $纬^* p \to n 蟺^+$ reaction from the same experiment. The results were obtained from scattering of 6 GeV longitudinally polarized electrons off longitudinally polarized protons using the CEBAF Large Acceptance Spectro… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1611.04987v1-abstract-full').style.display = 'inline'; document.getElementById('1611.04987v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1611.04987v1-abstract-full" style="display: none;"> Beam-target double-spin asymmetries and target single-spin asymmetries were measured for the exclusive $蟺^0$ electroproduction reaction $纬^* p \to p 蟺^0$, expanding an analysis of the $纬^* p \to n 蟺^+$ reaction from the same experiment. The results were obtained from scattering of 6 GeV longitudinally polarized electrons off longitudinally polarized protons using the CEBAF Large Acceptance Spectrometer at Jefferson Lab. The kinematic range covered is $1.1<W<3$ GeV and $1<Q^2<6$ GeV$^2$. Results were obtained for about 5700 bins in $W$, $Q^2$, \cthcm, and $蠁^*$. The beam-target asymmetries were found to generally be greater than zero, with relatively modest \phicmsp dependence. The target asymmetries exhibit very strong \phicmsp dependence, with a change in sign occurring between results at low $W$ and high $W$, in contrast to $蟺^+$ electroproduction. Reasonable agreement is found with phenomenological fits to previous data for $W<1.6$ GeV, but significant differences are seen at higher $W$. When combined with cross section measurements, as well as $蟺^+$ observables, the present results will provide powerful constraints on nucleon resonance amplitudes at moderate and large values of $Q^2$, for resonances with masses as high as 2.4 GeV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1611.04987v1-abstract-full').style.display = 'none'; document.getElementById('1611.04987v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 November, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">28 pages, 12 figures, submitted to Phys. Rev. C</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 95, 035207 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1607.03924">arXiv:1607.03924</a> <span> [<a href="https://arxiv.org/pdf/1607.03924">pdf</a>, <a href="https://arxiv.org/ps/1607.03924">ps</a>, <a href="https://arxiv.org/format/1607.03924">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.94.045206">10.1103/PhysRevC.94.045206 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of Target and Double-spin Asymmetries for the $\vec e\vec p\to e蟺^+ (n)$ Reaction in the Nucleon Resonance Region at Low $Q^2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Zheng%2C+X">X. Zheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosted%2C+P">P. Bosted</a>, <a href="/search/nucl-ex?searchtype=author&query=Deur%2C+A">A. Deur</a>, <a href="/search/nucl-ex?searchtype=author&query=Drozdov%2C+V">V. Drozdov</a>, <a href="/search/nucl-ex?searchtype=author&query=Fassi%2C+L+E">L. El Fassi</a>, <a href="/search/nucl-ex?searchtype=author&query=Kang%2C+H">Hyekoo Kang</a>, <a href="/search/nucl-ex?searchtype=author&query=Kovacs%2C+K">K. Kovacs</a>, <a href="/search/nucl-ex?searchtype=author&query=Kuhn%2C+S">S. Kuhn</a>, <a href="/search/nucl-ex?searchtype=author&query=Long%2C+E">E. Long</a>, <a href="/search/nucl-ex?searchtype=author&query=Phillips%2C+S+K">S. K. Phillips</a>, <a href="/search/nucl-ex?searchtype=author&query=Ripani%2C+M">M. Ripani</a>, <a href="/search/nucl-ex?searchtype=author&query=Slifer%2C+K">K. Slifer</a>, <a href="/search/nucl-ex?searchtype=author&query=Smith%2C+L+C">L. C. Smith</a>, <a href="/search/nucl-ex?searchtype=author&query=Adikaram%2C+D">D. Adikaram</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M+J">M. J. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Pereira%2C+S+A">S. Anefalos Pereira</a>, <a href="/search/nucl-ex?searchtype=author&query=Asryan%2C+G">G. Asryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Badui%2C+R+A">R. A. Badui</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+J">J. Ball</a>, <a href="/search/nucl-ex?searchtype=author&query=Baltzell%2C+N+A">N. A. Baltzell</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Batourine%2C+V">V. Batourine</a> , et al. (125 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1607.03924v2-abstract-short" style="display: inline;"> We report measurements of target- and double-spin asymmetries for the exclusive channel $\vec e\vec p\to e蟺^+ (n)$ in the nucleon resonance region at Jefferson Lab using the CEBAF Large Acceptance Spectrometer (CLAS). These asymmetries were extracted from data obtained using a longitudinally polarized NH$_3$ target and a longitudinally polarized electron beam with energies 1.1, 1.3, 2.0, 2.3 and 3… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1607.03924v2-abstract-full').style.display = 'inline'; document.getElementById('1607.03924v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1607.03924v2-abstract-full" style="display: none;"> We report measurements of target- and double-spin asymmetries for the exclusive channel $\vec e\vec p\to e蟺^+ (n)$ in the nucleon resonance region at Jefferson Lab using the CEBAF Large Acceptance Spectrometer (CLAS). These asymmetries were extracted from data obtained using a longitudinally polarized NH$_3$ target and a longitudinally polarized electron beam with energies 1.1, 1.3, 2.0, 2.3 and 3.0 GeV. The new results are consistent with previous CLAS publications but are extended to a low $Q^2$ range from $0.0065$ to $0.35$ (GeV$/c$)$^2$. The $Q^2$ access was made possible by a custom-built Cherenkov detector that allowed the detection of electrons for scattering angles as low as $6^\circ$. These results are compared with the unitary isobar models JANR and MAID, the partial-wave analysis prediction from SAID and the dynamic model DMT. In many kinematic regions our results, in particular results on the target asymmetry, help to constrain the polarization-dependent components of these models. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1607.03924v2-abstract-full').style.display = 'none'; document.getElementById('1607.03924v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 October, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 July, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">20 pages, 15 figures, to appear in Phys. Rev. C</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1604.04350">arXiv:1604.04350</a> <span> [<a href="https://arxiv.org/pdf/1604.04350">pdf</a>, <a href="https://arxiv.org/ps/1604.04350">ps</a>, <a href="https://arxiv.org/format/1604.04350">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.94.055201">10.1103/PhysRevC.94.055201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Target and Beam-Target Spin Asymmetries in Exclusive $蟺^+$ and $蟺^-$ Electroproduction with 1.6 to 5.7 GeV Electrons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Bosted%2C+P+E">P. E. Bosted</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Careccia%2C+S">S. Careccia</a>, <a href="/search/nucl-ex?searchtype=author&query=Dodge%2C+G">G. Dodge</a>, <a href="/search/nucl-ex?searchtype=author&query=Fersch%2C+R">R. Fersch</a>, <a href="/search/nucl-ex?searchtype=author&query=Kuhn%2C+S+E">S. E. Kuhn</a>, <a href="/search/nucl-ex?searchtype=author&query=Pierce%2C+J">J. Pierce</a>, <a href="/search/nucl-ex?searchtype=author&query=Prok%2C+Y">Y. Prok</a>, <a href="/search/nucl-ex?searchtype=author&query=Zheng%2C+X">X. Zheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adikaram%2C+D">D. Adikaram</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M+J">M. J. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Pereira%2C+S+A">S. Anefalos Pereira</a>, <a href="/search/nucl-ex?searchtype=author&query=Asryan%2C+G">G. Asryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Badui%2C+R+A">R. A. Badui</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+J">J. Ball</a>, <a href="/search/nucl-ex?searchtype=author&query=Baltzell%2C+N+A">N. A. Baltzell</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Batourine%2C+V">V. Batourine</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%BCltmann%2C+S">S. B眉ltmann</a> , et al. (137 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1604.04350v3-abstract-short" style="display: inline;"> Beam-target double spin asymmetries and target single-spin asymmetries in exclusive $蟺^+$ and $蟺^-$ electroproduction were obtained from scattering of 1.6 to 5.7 GeV longitudinally polarized electrons from longitudinally polarized protons (for $蟺^+$) and deuterons (for $蟺^-$) using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The kinematic range covered is $1.1<W<2.6$ GeV and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1604.04350v3-abstract-full').style.display = 'inline'; document.getElementById('1604.04350v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1604.04350v3-abstract-full" style="display: none;"> Beam-target double spin asymmetries and target single-spin asymmetries in exclusive $蟺^+$ and $蟺^-$ electroproduction were obtained from scattering of 1.6 to 5.7 GeV longitudinally polarized electrons from longitudinally polarized protons (for $蟺^+$) and deuterons (for $蟺^-$) using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The kinematic range covered is $1.1<W<2.6$ GeV and $0.05<Q^2<5$ GeV$^2$, with good anglular coverage in the forward hemisphere. The asymmetry results were divided into approximately 40,000 kinematic bins for $蟺^+$ from free protons and 15,000 bins for $蟺^-$ production from bound nucleons in the deuteron. The present results are found to be in reasonable agreement with fits to previous world data for $W<1.7$ GeV and $Q^2<0.5$ GeV$^2$, with discrepancies increasing at higher values of $Q^2$, especially for $W>1.5$ GeV. Very large target-spin asymmetries are observed for $W>1.6$ GeV. When combined with cross section measurements, the present results will provide powerful constraints on nucleon resonance amplitudes at moderate and large values of $Q^2$, for resonances with masses as high as 2.3 GeV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1604.04350v3-abstract-full').style.display = 'none'; document.getElementById('1604.04350v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 October, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 April, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">47 pages, 24 figures. This is a revised version that was accepted for publication in Phys. Rev. C. in early October, 2016</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 94, 055201 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1603.00315">arXiv:1603.00315</a> <span> [<a href="https://arxiv.org/pdf/1603.00315">pdf</a>, <a href="https://arxiv.org/format/1603.00315">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.95.065201">10.1103/PhysRevC.95.065201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of two-photon exchange effect by comparing elastic $e^\pm p$ cross sections </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Rimal%2C+D">D. Rimal</a>, <a href="/search/nucl-ex?searchtype=author&query=Adikaram%2C+D">D. Adikaram</a>, <a href="/search/nucl-ex?searchtype=author&query=Raue%2C+B+A">B. A. Raue</a>, <a href="/search/nucl-ex?searchtype=author&query=Weinstein%2C+L+B">L. B. Weinstein</a>, <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Ungaro%2C+M">M. Ungaro</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Pereira%2C+S+A">S. Anefalos Pereira</a>, <a href="/search/nucl-ex?searchtype=author&query=Badui%2C+R+A">R. A. Badui</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+J">J. Ball</a>, <a href="/search/nucl-ex?searchtype=author&query=Baltzell%2C+N+A">N. A. Baltzell</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Batourine%2C+V">V. Batourine</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Bennett%2C+R+P">R. P. Bennett</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%BCltmann%2C+S">S. B眉ltmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Carman%2C+D+S">D. S. Carman</a>, <a href="/search/nucl-ex?searchtype=author&query=Celentano%2C+A">A. Celentano</a>, <a href="/search/nucl-ex?searchtype=author&query=Chetry%2C+T">T. Chetry</a>, <a href="/search/nucl-ex?searchtype=author&query=Ciullo%2C+G">G. Ciullo</a> , et al. (120 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1603.00315v3-abstract-short" style="display: inline;"> [Background] The electromagnetic form factors of the proton measured by unpolarized and polarized electron scattering experiments show a significant disagreement that grows with the squared four momentum transfer ($Q^{2}$). Calculations have shown that the two measurements can be largely reconciled by accounting for the contributions of two-photon exchange (TPE). TPE effects are not typically incl… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1603.00315v3-abstract-full').style.display = 'inline'; document.getElementById('1603.00315v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1603.00315v3-abstract-full" style="display: none;"> [Background] The electromagnetic form factors of the proton measured by unpolarized and polarized electron scattering experiments show a significant disagreement that grows with the squared four momentum transfer ($Q^{2}$). Calculations have shown that the two measurements can be largely reconciled by accounting for the contributions of two-photon exchange (TPE). TPE effects are not typically included in the standard set of radiative corrections since theoretical calculations of the TPE effects are highly model dependent, and, until recently, no direct evidence of significant TPE effects has been observed. [Purpose] We measured the ratio of positron-proton to electron-proton elastic-scattering cross sections in order to determine the TPE contribution to elastic electron-proton scattering and thereby resolve the proton electric form factor discrepancy. [Methods] We produced a mixed simultaneous electron-positron beam in Jefferson Lab's Hall B by passing the 5.6 GeV primary electron beam through a radiator to produce a bremsstrahlung photon beam and then passing the photon beam through a convertor to produce electron/positron pairs. The mixed electron-positron (lepton) beam with useful energies from approximately 0.85 to 3.5 GeV then struck a 30-cm long liquid hydrogen (LH$_2$) target located within the CEBAF Large Acceptance Spectrometer (CLAS). By detecting both the scattered leptons and the recoiling protons we identified and reconstructed elastic scattering events and determined the incident lepton energy. A detailed description of the experiment is presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1603.00315v3-abstract-full').style.display = 'none'; document.getElementById('1603.00315v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 June, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 March, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">21 pages, 22 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 95, 065201 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1511.03338">arXiv:1511.03338</a> <span> [<a href="https://arxiv.org/pdf/1511.03338">pdf</a>, <a href="https://arxiv.org/format/1511.03338">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2017.02.032">10.1016/j.physletb.2017.02.032 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Target and Double Spin Asymmetries of Deeply Virtual $蟺^0$ Production with a Longitudinally Polarized Proton Target and CLAS </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Kim%2C+A">A. Kim</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V">V. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Joo%2C+K">K. Joo</a>, <a href="/search/nucl-ex?searchtype=author&query=Kim%2C+W">W. Kim</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Pereira%2C+S+A">S. Anefalos Pereira</a>, <a href="/search/nucl-ex?searchtype=author&query=Badui%2C+R+A">R. A. Badui</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Batourine%2C+V">V. Batourine</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosted%2C+P">P. Bosted</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%BCltmann%2C+S">S. B眉ltmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+T">T. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Carman%2C+D+S">D. S. Carman</a>, <a href="/search/nucl-ex?searchtype=author&query=Celentano%2C+A">A. Celentano</a>, <a href="/search/nucl-ex?searchtype=author&query=Chandavar%2C+S">S. Chandavar</a>, <a href="/search/nucl-ex?searchtype=author&query=Charles%2C+G">G. Charles</a>, <a href="/search/nucl-ex?searchtype=author&query=Chetry%2C+T">T. Chetry</a>, <a href="/search/nucl-ex?searchtype=author&query=Colaneri%2C+L">L. Colaneri</a> , et al. (104 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1511.03338v3-abstract-short" style="display: inline;"> The target and double spin asymmetries of the exclusive pseudoscalar channel $\vec e\vec p\to ep蟺^0$ were measured for the first time in the deep-inelastic regime using a longitudinally polarized 5.9 GeV electron beam and a longitudinally polarized proton target at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS). The data were collected over a large kinematic phase space and divi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1511.03338v3-abstract-full').style.display = 'inline'; document.getElementById('1511.03338v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1511.03338v3-abstract-full" style="display: none;"> The target and double spin asymmetries of the exclusive pseudoscalar channel $\vec e\vec p\to ep蟺^0$ were measured for the first time in the deep-inelastic regime using a longitudinally polarized 5.9 GeV electron beam and a longitudinally polarized proton target at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS). The data were collected over a large kinematic phase space and divided into 110 four-dimensional bins of $Q^2$, $x_B$, $-t$ and $蠁$. Large values of asymmetry moments clearly indicate a substantial contribution to the polarized structure functions from transverse virtual photon amplitudes. The interpretation of experimental data in terms of generalized parton distributions (GPDs) provides the first insight on the chiral-odd GPDs $\tilde{H}_T$ and $E_T$, and complement previous measurements of unpolarized structure functions sensitive to the GPDs $H_T$ and $\bar E_T$. These data provide necessary constraints for chiral-odd GPD parametrizations and will strongly influence existing theoretical handbag models. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1511.03338v3-abstract-full').style.display = 'none'; document.getElementById('1511.03338v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 March, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 November, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physics Letters B 768 (2017) 168-173 </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 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