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class="list-title is-inline-block"><a href="https://arxiv.org/abs/2411.05201">arXiv:2411.05201</a> <span> [<a href="https://arxiv.org/pdf/2411.05201">pdf</a>, <a href="https://arxiv.org/ps/2411.05201">ps</a>, <a href="https://arxiv.org/format/2411.05201">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"> High precision measurements of the proton elastic electromagnetic form factors and their ratio at $Q^2$ = 0.50, 2.64, 3.20, and 4.10 GeV$^2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Qattan%2C+I+A">I. A. Qattan</a>, <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Aniol%2C+K">K. Aniol</a>, <a href="/search/nucl-ex?searchtype=author&query=Baker%2C+O+K">O. K. Baker</a>, <a href="/search/nucl-ex?searchtype=author&query=Beams%2C+R">R. Beams</a>, <a href="/search/nucl-ex?searchtype=author&query=Brash%2C+E+J">E. J. Brash</a>, <a href="/search/nucl-ex?searchtype=author&query=Camsonne%2C+A">A. Camsonne</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+J+-">J. -P. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Christy%2C+M+E">M. E. Christy</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutta%2C+D">D. Dutta</a>, <a href="/search/nucl-ex?searchtype=author&query=Ent%2C+R">R. Ent</a>, <a href="/search/nucl-ex?searchtype=author&query=Gaskell%2C+D">D. Gaskell</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayou%2C+O">O. Gayou</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilman%2C+R">R. Gilman</a>, <a href="/search/nucl-ex?searchtype=author&query=Hansen%2C+J+-">J. -O. Hansen</a>, <a href="/search/nucl-ex?searchtype=author&query=Higinbotham%2C+D+W">D. W. Higinbotham</a>, <a href="/search/nucl-ex?searchtype=author&query=Holt%2C+R+J">R. J. Holt</a>, <a href="/search/nucl-ex?searchtype=author&query=Huber%2C+G+M">G. M. Huber</a>, <a href="/search/nucl-ex?searchtype=author&query=Ibrahim%2C+H">H. Ibrahim</a>, <a href="/search/nucl-ex?searchtype=author&query=Jisonna%2C+L">L. Jisonna</a>, <a href="/search/nucl-ex?searchtype=author&query=Jones%2C+M+K">M. K. Jones</a>, <a href="/search/nucl-ex?searchtype=author&query=Keppel%2C+C+E">C. E. Keppel</a>, <a href="/search/nucl-ex?searchtype=author&query=Kinney%2C+E">E. Kinney</a>, <a href="/search/nucl-ex?searchtype=author&query=Kumbartzki%2C+G+J">G. J. Kumbartzki</a>, <a href="/search/nucl-ex?searchtype=author&query=Lung%2C+A">A. Lung</a> , et al. (15 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="2411.05201v1-abstract-short" style="display: inline;"> The advent of high-intensity, high-polarization electron beams led to significantly improved measurements of the ratio of the proton's charge to electric form factors, GEp/GMp. However, high-$Q^2$ measurements yielded significant disagreement with extractions based on unpolarized scattering, raising questions about the reliability of the measurements and consistency of the techniques. Jefferson La… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.05201v1-abstract-full').style.display = 'inline'; document.getElementById('2411.05201v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.05201v1-abstract-full" style="display: none;"> The advent of high-intensity, high-polarization electron beams led to significantly improved measurements of the ratio of the proton's charge to electric form factors, GEp/GMp. However, high-$Q^2$ measurements yielded significant disagreement with extractions based on unpolarized scattering, raising questions about the reliability of the measurements and consistency of the techniques. Jefferson Lab experiment E01-001 was designed to provide a high-precision extraction of GEp/GMp from unpolarized cross section measurements using a modified version of the Rosenbluth technique to allow for a more precise comparison with polarization data. Conventional Rosenbluth separations detect the scattered electron which requires comparisons of measurements with very different detected electron energy and rate for electrons at different angles. Our Super-Rosenbluth measurement detected the struck proton, rather than the scattered electron, to extract the cross section. This yielded a fixed momentum for the detected particle and dramatically reduced cross section variation, reducing rate- and momentum-dependent corrections and uncertainties. We measure the cross section vs angle with high relative precision, allowing for extremely precise extractions of GEp/GMp at $Q^2$ = 2.64, 3.20, and 4.10 GeV$^2$. Our results are consistent with traditional extractions but with much smaller corrections and systematic uncertainties, comparable to the uncertainties from polarization measurements. Our data confirm the discrepancy between Rosenbluth and polarization extractions of the proton form factor ratio using an improved Rosenbluth extraction that yields smaller and less-correlated uncertainties than typical of previous Rosenbluth extractions. We compare our results to calculations of two-photon exchange effects and find that the observed discrepancy can be relatively well explained by such effects. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.05201v1-abstract-full').style.display = 'none'; document.getElementById('2411.05201v1-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, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </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">32 pages, 21 figures. arXiv admin note: text overlap with arXiv:nucl-ex/0610006</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.12099">arXiv:2410.12099</a> <span> [<a href="https://arxiv.org/pdf/2410.12099">pdf</a>, <a href="https://arxiv.org/ps/2410.12099">ps</a>, <a href="https://arxiv.org/format/2410.12099">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 EMC Effect of Tritium and Helium-3 from the JLab MARATHON Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Abrams%2C+D">D. Abrams</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+S">B. S. Aljawrneh</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=Armstrong%2C+W">W. Armstrong</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=Beck%2C+A">A. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellini%2C+V">V. Bellini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhatt%2C+H">H. Bhatt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhetuwal%2C+D">D. Bhetuwal</a>, <a href="/search/nucl-ex?searchtype=author&query=Biswas%2C+D">D. Biswas</a>, <a href="/search/nucl-ex?searchtype=author&query=Blyth%2C+D">D. Blyth</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W">W. Boeglin</a>, <a href="/search/nucl-ex?searchtype=author&query=Bulumulla%2C+D">D. Bulumulla</a>, <a href="/search/nucl-ex?searchtype=author&query=Butler%2C+J">J. Butler</a>, <a href="/search/nucl-ex?searchtype=author&query=Camsonne%2C+A">A. Camsonne</a>, <a href="/search/nucl-ex?searchtype=author&query=Carmignotto%2C+M">M. Carmignotto</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="2410.12099v1-abstract-short" style="display: inline;"> Measurements of the EMC effect in the tritium and helium-3 mirror nuclei are reported. The data were obtained by the MARATHON Jefferson Lab experiment, which performed deep inelastic electron scattering from deuterium and the three-body nuclei, using a cryogenic gas target system and the High Resolution Spectrometers of the Hall A Facility of the Lab. The data cover the Bjorken $x$ range from 0.20… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.12099v1-abstract-full').style.display = 'inline'; document.getElementById('2410.12099v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.12099v1-abstract-full" style="display: none;"> Measurements of the EMC effect in the tritium and helium-3 mirror nuclei are reported. The data were obtained by the MARATHON Jefferson Lab experiment, which performed deep inelastic electron scattering from deuterium and the three-body nuclei, using a cryogenic gas target system and the High Resolution Spectrometers of the Hall A Facility of the Lab. The data cover the Bjorken $x$ range from 0.20 to 0.83, corresponding to a squared four-momentum transfer $Q^2$ range from 2.7 to $11.9\gevsq$, and to an invariant mass $W$ of the final hadronic state greater than 1.84 GeV/${\it c}^2$. The tritium EMC effect measurement is the first of its kind. The MARATHON experimental results are compared to results from previous measurements by DESY-HERMES and JLab-Hall C experiments, as well as with few-body theoretical predictions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.12099v1-abstract-full').style.display = 'none'; document.getElementById('2410.12099v1-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 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </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: text overlap with arXiv:2104.05850</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.18463">arXiv:2409.18463</a> <span> [<a href="https://arxiv.org/pdf/2409.18463">pdf</a>, <a href="https://arxiv.org/format/2409.18463">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"> First Measurement of Near- and Sub-Threshold $J/蠄$ Photoproduction off Nuclei </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Pybus%2C+J+R">J. R. Pybus</a>, <a href="/search/nucl-ex?searchtype=author&query=Ehinger%2C+L">L. Ehinger</a>, <a href="/search/nucl-ex?searchtype=author&query=Kolar%2C+T">T. Kolar</a>, <a href="/search/nucl-ex?searchtype=author&query=Devkota%2C+B">B. Devkota</a>, <a href="/search/nucl-ex?searchtype=author&query=Sharp%2C+P">P. Sharp</a>, <a href="/search/nucl-ex?searchtype=author&query=Yu%2C+B">B. Yu</a>, <a href="/search/nucl-ex?searchtype=author&query=Dalton%2C+M+M">M. M. Dalton</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutta%2C+D">D. Dutta</a>, <a href="/search/nucl-ex?searchtype=author&query=Gao%2C+H">H. Gao</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=Santiesteban%2C+S+N">S. N. Santiesteban</a>, <a href="/search/nucl-ex?searchtype=author&query=Schmidt%2C+A">A. Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Somov%2C+A">A. Somov</a>, <a href="/search/nucl-ex?searchtype=author&query=Szumila-Vance%2C+H">H. Szumila-Vance</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</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=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Barlow%2C+J">J. Barlow</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=Bhatt%2C+H+D">H. D. Bhatt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhetuwal%2C+D">Deepak Bhetuwal</a>, <a href="/search/nucl-ex?searchtype=author&query=Black%2C+T">T. Black</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a> , et al. (43 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="2409.18463v2-abstract-short" style="display: inline;"> We report on the first measurement of $J/蠄$ photoproduction from nuclei in the photon energy range of $7$ to $10.8$ GeV, extending above and below the photoproduction threshold in the free proton of $\sim8.2$ GeV. The experiment used a tagged photon beam incident on deuterium, helium, and carbon, and the GlueX detector at Jefferson Lab to measure the semi-inclusive $A(纬,e^+e^-p)$ reaction with a d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.18463v2-abstract-full').style.display = 'inline'; document.getElementById('2409.18463v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.18463v2-abstract-full" style="display: none;"> We report on the first measurement of $J/蠄$ photoproduction from nuclei in the photon energy range of $7$ to $10.8$ GeV, extending above and below the photoproduction threshold in the free proton of $\sim8.2$ GeV. The experiment used a tagged photon beam incident on deuterium, helium, and carbon, and the GlueX detector at Jefferson Lab to measure the semi-inclusive $A(纬,e^+e^-p)$ reaction with a dilepton invariant mass $M(e^+e^-)\sim m_{J/蠄}=3.1$ GeV. The incoherent $J/蠄$ photoproduction cross sections in the measured nuclei are extracted as a function of the incident photon energy, momentum transfer, and proton reconstructed missing light-cone momentum fraction. Comparisons with theoretical predictions assuming a dipole form factor allow extracting a gluonic radius for bound protons of $\sqrt{\langle r^2\rangle}=0.85\pm0.14$ fm. The data also suggest an excess of the measured cross section for sub-threshold production and for interactions with high missing light-cone momentum fraction protons. The measured enhancement can be explained by modified gluon structure for high-virtuality bound-protons. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.18463v2-abstract-full').style.display = 'none'; document.getElementById('2409.18463v2-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 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.16370">arXiv:2409.16370</a> <span> [<a href="https://arxiv.org/pdf/2409.16370">pdf</a>, <a href="https://arxiv.org/format/2409.16370">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"> Quasielastic $\overrightarrow{^{3}\mathrm{He}}(\overrightarrow{e},{e'})$ Asymmetry in the Threshold Region </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Nycz%2C+M">M. Nycz</a>, <a href="/search/nucl-ex?searchtype=author&query=Armstrong%2C+W">W. Armstrong</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=Benesch%2C+J">J. Benesch</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhatt%2C+H">H. Bhatt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhetuwal%2C+D">D. Bhetuwal</a>, <a href="/search/nucl-ex?searchtype=author&query=Biswas%2C+D">D. Biswas</a>, <a href="/search/nucl-ex?searchtype=author&query=Camsonne%2C+A">A. Camsonne</a>, <a href="/search/nucl-ex?searchtype=author&query=Cates%2C+G">G. Cates</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+J">J-P. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+J">J. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+M">M. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Cotton%2C+C">C. Cotton</a>, <a href="/search/nucl-ex?searchtype=author&query=Dalton%2C+M">M-M. Dalton</a>, <a href="/search/nucl-ex?searchtype=author&query=Deltuva%2C+A">A. Deltuva</a>, <a href="/search/nucl-ex?searchtype=author&query=Deur%2C+A">A. Deur</a>, <a href="/search/nucl-ex?searchtype=author&query=Dhital%2C+B">B. Dhital</a>, <a href="/search/nucl-ex?searchtype=author&query=Duran%2C+B">B. Duran</a>, <a href="/search/nucl-ex?searchtype=author&query=Dusa%2C+S+C">S. C. Dusa</a>, <a href="/search/nucl-ex?searchtype=author&query=Fernando%2C+I">I. Fernando</a>, <a href="/search/nucl-ex?searchtype=author&query=Fuchey%2C+E">E. Fuchey</a> , et al. (75 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="2409.16370v1-abstract-short" style="display: inline;"> A measurement of the double-spin asymmetry from electron-$^{3}$He scattering in the threshold region of two- and three-body breakup of $^{3}$He was performed at Jefferson Lab, for Q$^{2}$ values of 0.1 and 0.2 (GeV/$c$)$^{2}$. The results of this measurement serve as a stringent test of our understanding of few-body systems. When compared with calculations from plane wave impulse approximation and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.16370v1-abstract-full').style.display = 'inline'; document.getElementById('2409.16370v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.16370v1-abstract-full" style="display: none;"> A measurement of the double-spin asymmetry from electron-$^{3}$He scattering in the threshold region of two- and three-body breakup of $^{3}$He was performed at Jefferson Lab, for Q$^{2}$ values of 0.1 and 0.2 (GeV/$c$)$^{2}$. The results of this measurement serve as a stringent test of our understanding of few-body systems. When compared with calculations from plane wave impulse approximation and Faddeev theory, we found that the Faddeev calculations, which use modern nuclear potentials and prescriptions for meson-exchange currents, demonstrate an overall good agreement with data. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.16370v1-abstract-full').style.display = 'none'; document.getElementById('2409.16370v1-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 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2404.16235">arXiv:2404.16235</a> <span> [<a href="https://arxiv.org/pdf/2404.16235">pdf</a>, <a href="https://arxiv.org/format/2404.16235">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="Nuclear Theory">nucl-th</span> </div> </div> <p class="title is-5 mathjax"> Inclusive studies of two- and three-nucleon short-range correlations in $^3$H and $^3$He </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Li%2C+S">S. Li</a>, <a href="/search/nucl-ex?searchtype=author&query=Santiesteban%2C+S+N">S. N. Santiesteban</a>, <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Cruz-Torres%2C+R">R. Cruz-Torres</a>, <a href="/search/nucl-ex?searchtype=author&query=Kurbany%2C+L">L. Kurbany</a>, <a href="/search/nucl-ex?searchtype=author&query=Abrams%2C+D">D. Abrams</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=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=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=Barrow%2C+J">J. Barrow</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+A">A. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellini%2C+V">V. Bellini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhatt%2C+H">H. Bhatt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhetuwal%2C+D">D. Bhetuwal</a>, <a href="/search/nucl-ex?searchtype=author&query=Biswas%2C+D">D. Biswas</a>, <a href="/search/nucl-ex?searchtype=author&query=Bulumulla%2C+D">D. Bulumulla</a>, <a href="/search/nucl-ex?searchtype=author&query=Camsonne%2C+A">A. Camsonne</a>, <a href="/search/nucl-ex?searchtype=author&query=Castellanos%2C+J">J. Castellanos</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+J">J. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+J">J-P. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chrisman%2C+D">D. Chrisman</a> , et al. (91 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="2404.16235v1-abstract-short" style="display: inline;"> Inclusive electron scattering at carefully chosen kinematics can isolate scattering from short-range correlations (SRCs), produced through hard, short-distance interactions of nucleons in the nucleus. Because the two-nucleon (2N) SRCs arise from the same N-N interaction in all nuclei, the cross section in the SRC-dominated regime is identical up to an overall scaling factor, and the A/2H cross sec… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.16235v1-abstract-full').style.display = 'inline'; document.getElementById('2404.16235v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2404.16235v1-abstract-full" style="display: none;"> Inclusive electron scattering at carefully chosen kinematics can isolate scattering from short-range correlations (SRCs), produced through hard, short-distance interactions of nucleons in the nucleus. Because the two-nucleon (2N) SRCs arise from the same N-N interaction in all nuclei, the cross section in the SRC-dominated regime is identical up to an overall scaling factor, and the A/2H cross section ratio is constant in this region. This scaling behavior has been used to identify SRC dominance and to map out the contribution of SRCs for a wide range of nuclei. We examine this scaling behavior at lower momentum transfers using new data on $^2$H, $^3$H, and $^3$He which show that the scaling region is larger than in heavy nuclei. Based on the improved scaling, especially for $^3$H/$^3$He, we examine the ratios at kinematics where three-nucleon SRCs may play an important role. The data for the largest initial nucleon momenta are consistent with isolation of scattering from 3N-SRCs, and suggest that the very-highest momentum nucleons in $^3$He have a nearly isospin-independent momentum configuration, or a small enhancement of the proton distribution. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.16235v1-abstract-full').style.display = 'none'; document.getElementById('2404.16235v1-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, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.01173">arXiv:2403.01173</a> <span> [<a href="https://arxiv.org/pdf/2403.01173">pdf</a>, <a href="https://arxiv.org/format/2403.01173">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"> Electroproduction of the Lambda/Sigma^0 hyperons at Q^2~0.5 (GeV/c)^2 at forward angles </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Okuyama%2C+K">K. Okuyama</a>, <a href="/search/nucl-ex?searchtype=author&query=Itabashi%2C+K">K. Itabashi</a>, <a href="/search/nucl-ex?searchtype=author&query=Nagao%2C+S">S. Nagao</a>, <a href="/search/nucl-ex?searchtype=author&query=Nakamura%2C+S+N">S. N. Nakamura</a>, <a href="/search/nucl-ex?searchtype=author&query=Suzuki%2C+K+N">K. N. Suzuki</a>, <a href="/search/nucl-ex?searchtype=author&query=Gogami%2C+T">T. Gogami</a>, <a href="/search/nucl-ex?searchtype=author&query=Pandey%2C+B">B. Pandey</a>, <a href="/search/nucl-ex?searchtype=author&query=Tang%2C+L">L. Tang</a>, <a href="/search/nucl-ex?searchtype=author&query=Byd%C5%BEovsk%C3%BD%2C+P">P. Byd啪ovsk媒</a>, <a href="/search/nucl-ex?searchtype=author&query=Skoupil%2C+D">D. Skoupil</a>, <a href="/search/nucl-ex?searchtype=author&query=Mart%2C+T">T. Mart</a>, <a href="/search/nucl-ex?searchtype=author&query=Abrams%2C+D">D. Abrams</a>, <a href="/search/nucl-ex?searchtype=author&query=Akiyama%2C+T">T. Akiyama</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=Gayoso%2C+C+A">C. Ayerbe Gayoso</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=Barrow%2C+J">J. Barrow</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellini%2C+V">V. Bellini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhatt%2C+H">H. Bhatt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhetuwal%2C+D">D. Bhetuwal</a>, <a href="/search/nucl-ex?searchtype=author&query=Biswas%2C+D">D. Biswas</a>, <a href="/search/nucl-ex?searchtype=author&query=Camsonne%2C+A">A. Camsonne</a>, <a href="/search/nucl-ex?searchtype=author&query=Castellanos%2C+J">J. Castellanos</a> , et al. (61 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="2403.01173v5-abstract-short" style="display: inline;"> In 2018, the E12-17-003 experiment was conducted at the Thomas Jefferson National Accelerator Facility (JLab) to explore the possible existence of an nnLambda state in the reconstructed missing mass distribution from a tritium gas target [K. N. Suzuki et al., Prog. Theor. Exp. Phys. 2022, 013D01 (2022), B. Pandey et al., Phys. Rev. C 105, L051001 (2022)]. As part of this investigation, data was al… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.01173v5-abstract-full').style.display = 'inline'; document.getElementById('2403.01173v5-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.01173v5-abstract-full" style="display: none;"> In 2018, the E12-17-003 experiment was conducted at the Thomas Jefferson National Accelerator Facility (JLab) to explore the possible existence of an nnLambda state in the reconstructed missing mass distribution from a tritium gas target [K. N. Suzuki et al., Prog. Theor. Exp. Phys. 2022, 013D01 (2022), B. Pandey et al., Phys. Rev. C 105, L051001 (2022)]. As part of this investigation, data was also collected using a gaseous hydrogen target, not only for a precise absolute mass scale calibration but also for the study of Lambda/Sigma^0 electroproduction. This dataset was acquired at Q^2~0.5 (GeV/c)^2, W=2.14 GeV, and theta_{gamma K}^{c.m.}~8 deg. It covers forward angles where photoproduction data is scarce and a low-Q^2 region that is of interest for hypernuclear experiments. On the other hand, this kinematic region is at a slightly higher Q^2 than previous hypernuclear experiments, thus providing crucial information for understanding the Q^2 dependence of the differential cross sections for Lambda/Sigma^0 hyperon electroproduction. This paper reports on the Q^2 dependence of the differential cross section for the e + p -> e' + K^+ + Lambda/Sigma^0 reaction in the 0.2-0.8 (GeV/c)^2, and provides comparisons with the currently available theoretical models. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.01173v5-abstract-full').style.display = 'none'; document.getElementById('2403.01173v5-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> 4 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </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, 15 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/2402.08199">arXiv:2402.08199</a> <span> [<a href="https://arxiv.org/pdf/2402.08199">pdf</a>, <a href="https://arxiv.org/format/2402.08199">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</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"> A=3 (e,e') $x_B \geq 1$ cross-section ratios and the isospin structure of short-range correlations </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=Denniston%2C+A+W">A. W. Denniston</a>, <a href="/search/nucl-ex?searchtype=author&query=Seroka%2C+E+M">E. M. Seroka</a>, <a href="/search/nucl-ex?searchtype=author&query=Barnea%2C+N">N. Barnea</a>, <a href="/search/nucl-ex?searchtype=author&query=Higinbotham%2C+D+W">D. W. Higinbotham</a>, <a href="/search/nucl-ex?searchtype=author&query=Korover%2C+I">I. Korover</a>, <a href="/search/nucl-ex?searchtype=author&query=Miller%2C+G+A">G. A. Miller</a>, <a href="/search/nucl-ex?searchtype=author&query=Piasetzky%2C+E">E. Piasetzky</a>, <a href="/search/nucl-ex?searchtype=author&query=Strikman%2C+M">M. Strikman</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=Weiss%2C+R">R. Weiss</a>, <a href="/search/nucl-ex?searchtype=author&query=Hen%2C+O">O. Hen</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="2402.08199v1-abstract-short" style="display: inline;"> We study the relation between measured high-$x_B$, high-$Q^2$, Helium-3 to Tritium, $(e,e')$ inclusive-scattering cross-section ratios and the relative abundance of high-momentum neutron-proton ($np$) and proton-proton ($pp$) short-range correlated (SRC) nucleon pairs in three-body ($A=3$) nuclei. Analysis of this data using a simple pair-counting cross-section model suggested a much smaller… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.08199v1-abstract-full').style.display = 'inline'; document.getElementById('2402.08199v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.08199v1-abstract-full" style="display: none;"> We study the relation between measured high-$x_B$, high-$Q^2$, Helium-3 to Tritium, $(e,e')$ inclusive-scattering cross-section ratios and the relative abundance of high-momentum neutron-proton ($np$) and proton-proton ($pp$) short-range correlated (SRC) nucleon pairs in three-body ($A=3$) nuclei. Analysis of this data using a simple pair-counting cross-section model suggested a much smaller $np/pp$ ratio than previously measured in heavier nuclei, questioning our understanding of $A=3$ nuclei and, by extension, all other nuclei. Here we examine this finding using spectral-function-based cross-section calculations, with both an \textit{ab initio} $A=3$ spectral function and effective Generalized Contact Formalism (GCF) spectral functions using different nucleon-nucleon interaction models. The \textit{ab initio} calculation agrees with the data, showing good understanding of the structure of $A=3$ nuclei. An 8\% uncertainty on the simple pair-counting model, as implied by the difference between it and the \textit{ab initio} calculation, gives a factor of 5 uncertainty in the extracted $np/pp$ ratio. Thus we see no evidence for the claimed ``unexpected structure in the high-momentum wavefunction for hydrogen-3 and helium-3''. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.08199v1-abstract-full').style.display = 'none'; document.getElementById('2402.08199v1-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 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2024. </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> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.01231">arXiv:2312.01231</a> <span> [<a href="https://arxiv.org/pdf/2312.01231">pdf</a>, <a href="https://arxiv.org/format/2312.01231">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"> Proposal to PAC 51: Color Transparency in Maximal Rescattering Kinematics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Li%2C+S">Shujie Li</a>, <a href="/search/nucl-ex?searchtype=author&query=Yero%2C+C">Carlos Yero</a>, <a href="/search/nucl-ex?searchtype=author&query=West%2C+J+R">Jennifer Rittenhouse West</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=Higinbotham%2C+D+W">Douglas W. Higinbotham</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="2312.01231v2-abstract-short" style="display: inline;"> With the current highest beam energy at Jefferson Lab and traditional methods, we have exhausted our sensitivity for observing the onset of proton color transparency in a nucleus in A(e,e'p) parallel scattering kinematics for up to $Q^{2}$ = 14 GeV$^{2}$ . One of the disadvantages in A(e,e'p) experiments is that even if a point-like color singlet is produced at such $Q^{2}$, its expansion is uncon… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.01231v2-abstract-full').style.display = 'inline'; document.getElementById('2312.01231v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.01231v2-abstract-full" style="display: none;"> With the current highest beam energy at Jefferson Lab and traditional methods, we have exhausted our sensitivity for observing the onset of proton color transparency in a nucleus in A(e,e'p) parallel scattering kinematics for up to $Q^{2}$ = 14 GeV$^{2}$ . One of the disadvantages in A(e,e'p) experiments is that even if a point-like color singlet is produced at such $Q^{2}$, its expansion is unconstrained over the full radius of the nuclei, with the potential to significantly reduce the size of the color transparency effect. Therefore, in order to be sensitive to the effects of color transparency, we enhance the sensitivity of the measurement to the production of a point-like color neutral object prior to the onset of wave-function expansion. In this experiment, we propose a color transparency measurement in maximal rescattering ("dirty") kinematics in deuterium where final-state interactions (FSIs) are known to be huge effects, thereby enhancing our sensitivity to a reduction in FSIs indicative of color transparency. The kinematics in exclusive processes in deuterium can be precisely chosen such that the inter-nucleon distances of the struck and spectator nucleon lead to well-controlled FSIs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.01231v2-abstract-full').style.display = 'none'; document.getElementById('2312.01231v2-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 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">18 pages, 14 figures, Jefferson Lab Program Advisory Committee (PAC) 51 experimental proposal</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2308.08777">arXiv:2308.08777</a> <span> [<a href="https://arxiv.org/pdf/2308.08777">pdf</a>, <a href="https://arxiv.org/format/2308.08777">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"> A Direct Measurement of Hard Two-Photon Exchange with Electrons and Positrons at CLAS12 </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=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Cortes%2C+O">O. Cortes</a>, <a href="/search/nucl-ex?searchtype=author&query=Earnest%2C+L">L. Earnest</a>, <a href="/search/nucl-ex?searchtype=author&query=Grauvogel%2C+G+N">G. N. Grauvogel</a>, <a href="/search/nucl-ex?searchtype=author&query=Ratliff%2C+S">S. Ratliff</a>, <a href="/search/nucl-ex?searchtype=author&query=Seroka%2C+E+M">E. M. Seroka</a>, <a href="/search/nucl-ex?searchtype=author&query=Sharp%2C+P">P. Sharp</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=Niculescu%2C+G">G. Niculescu</a>, <a href="/search/nucl-ex?searchtype=author&query=Diehl%2C+S">S. Diehl</a>, <a href="/search/nucl-ex?searchtype=author&query=Blunden%2C+P+G">P. G. Blunden</a>, <a href="/search/nucl-ex?searchtype=author&query=Cline%2C+E">E. Cline</a>, <a href="/search/nucl-ex?searchtype=author&query=Korover%2C+I">I. Korover</a>, <a href="/search/nucl-ex?searchtype=author&query=Kutz%2C+T">T. Kutz</a>, <a href="/search/nucl-ex?searchtype=author&query=Santiesteban%2C+S+N">S. N. Santiesteban</a>, <a href="/search/nucl-ex?searchtype=author&query=Fogler%2C+C">C. Fogler</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=Marchand%2C+D">D. Marchand</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=D%27Angelo%2C+A">A. D'Angelo</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=Singh%2C+R">R. Singh</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V">V. Burkert</a> , et al. (7 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="2308.08777v1-abstract-short" style="display: inline;"> One of the most surprising discoveries made at Jefferson Lab has been the discrepancy in the determinations of the proton's form factor ratio $渭_p G_E^p/G_M^p$ between unpolarized cross section measurements and the polarization transfer technique. Over two decades later, the discrepancy not only persists but has been confirmed at higher momentum transfers now accessible in the 12-GeV era. The lead… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.08777v1-abstract-full').style.display = 'inline'; document.getElementById('2308.08777v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2308.08777v1-abstract-full" style="display: none;"> One of the most surprising discoveries made at Jefferson Lab has been the discrepancy in the determinations of the proton's form factor ratio $渭_p G_E^p/G_M^p$ between unpolarized cross section measurements and the polarization transfer technique. Over two decades later, the discrepancy not only persists but has been confirmed at higher momentum transfers now accessible in the 12-GeV era. The leading hypothesis for the cause of this discrepancy, a non-negligible contribution from hard two-photon exchange, has neither been conclusively proven or disproven. This state of uncertainty not only clouds our knowledge of one-dimensional nucleon structure but also poses a major concern for our field's efforts to map out the three-dimensional nuclear structure. A better understanding of multi-photon exchange over a wide phase space is needed. We propose making comprehensive measurements of two-photon exchange over a wide range in momentum transfer and scattering angle using the CLAS12 detector. Specifically, we will measure the ratio of positron-proton to electron-proton elastic scattering cross sections, using the proposed positron beam upgrade for CEBAF. The experiment will use 2.2, 4.4, and 6.6 GeV lepton beams incident on the standard CLAS12 unpolarized hydrogen target. Data will be collected by the CLAS12 detector in its standard configuration, except for a modified trigger to allow the recording of events with beam leptons scattered into the CLAS12 central detector. The sign of the beam charge, as well as the polarity of the CLAS12 solenoid and toroid, will be reversed several times in order to suppress systematics associated with local detector efficiency and time-dependent detector performance. The proposed high-precision determination of two-photon effects will be... <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.08777v1-abstract-full').style.display = 'none'; document.getElementById('2308.08777v1-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> 17 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 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">Experimental Proposal E12+23-008 submitted to Jefferson Lab PAC 51, 34 pages, 18 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/2308.06339">arXiv:2308.06339</a> <span> [<a href="https://arxiv.org/pdf/2308.06339">pdf</a>, <a href="https://arxiv.org/format/2308.06339">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> </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.2024.138790">10.1016/j.physletb.2024.138790 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for axion-like particles through nuclear Primakoff production using the GlueX detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Pybus%2C+J+R">J. R. Pybus</a>, <a href="/search/nucl-ex?searchtype=author&query=Kolar%2C+T">T. Kolar</a>, <a href="/search/nucl-ex?searchtype=author&query=Devkota%2C+B">B. Devkota</a>, <a href="/search/nucl-ex?searchtype=author&query=Sharp%2C+P">P. Sharp</a>, <a href="/search/nucl-ex?searchtype=author&query=Yu%2C+B">B. Yu</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=Santiesteban%2C+S+N">S. N. Santiesteban</a>, <a href="/search/nucl-ex?searchtype=author&query=Schmidt%2C+A">A. Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Somov%2C+A">A. Somov</a>, <a href="/search/nucl-ex?searchtype=author&query=Soreq%2C+Y">Y. Soreq</a>, <a href="/search/nucl-ex?searchtype=author&query=Szumila-Vance%2C+H">H. Szumila-Vance</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=Gayoso%2C+C+A">C. Ayerbe Gayoso</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=Bhatt%2C+H">H. Bhatt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhetuwal%2C+D">D. Bhetuwal</a>, <a href="/search/nucl-ex?searchtype=author&query=Dalton%2C+M+M">M. M. Dalton</a>, <a href="/search/nucl-ex?searchtype=author&query=Deur%2C+A">A. Deur</a>, <a href="/search/nucl-ex?searchtype=author&query=Dotel%2C+R">R. Dotel</a>, <a href="/search/nucl-ex?searchtype=author&query=Fanelli%2C+C">C. Fanelli</a>, <a href="/search/nucl-ex?searchtype=author&query=Guo%2C+J">J. Guo</a>, <a href="/search/nucl-ex?searchtype=author&query=Hague%2C+T+J">T. J. Hague</a>, <a href="/search/nucl-ex?searchtype=author&query=Higinbotham%2C+D+W">D. W. Higinbotham</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoffman%2C+N+D">N. D. Hoffman</a> , et al. (18 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="2308.06339v1-abstract-short" style="display: inline;"> We report on the results of the first search for the production of axion-like particles (ALP) via Primakoff production on nuclear targets using the GlueX detector. This search uses an integrated luminosity of 100 pb$^{-1}\cdot$nucleon on a $^{12}$C target, and explores the mass region of 200 < $m_a$ < 450 MeV via the decay $X\rightarrow纬纬$. This mass range is between the $蟺^0$ and $畏$ masses, whic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.06339v1-abstract-full').style.display = 'inline'; document.getElementById('2308.06339v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2308.06339v1-abstract-full" style="display: none;"> We report on the results of the first search for the production of axion-like particles (ALP) via Primakoff production on nuclear targets using the GlueX detector. This search uses an integrated luminosity of 100 pb$^{-1}\cdot$nucleon on a $^{12}$C target, and explores the mass region of 200 < $m_a$ < 450 MeV via the decay $X\rightarrow纬纬$. This mass range is between the $蟺^0$ and $畏$ masses, which enables the use of the measured $畏$ production rate to obtain absolute bounds on the ALP production with reduced sensitivity to experimental luminosity and detection efficiency. We find no evidence for an ALP, consistent with previous searches in the quoted mass range, and present limits on the coupling on the scale of $O$(1 TeV). We further find that the ALP production limit we obtain is hindered by the peaking structure of the non-target-related dominant background in GlueX, which we treat by using data on $^4$He to estimate and subtract these backgrounds. We comment on how this search can be improved in a future higher-statistics dedicated measurement. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.06339v1-abstract-full').style.display = 'none'; document.getElementById('2308.06339v1-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 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2023. </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/2304.13770">arXiv:2304.13770</a> <span> [<a href="https://arxiv.org/pdf/2304.13770">pdf</a>, <a href="https://arxiv.org/ps/2304.13770">ps</a>, <a href="https://arxiv.org/format/2304.13770">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"> A novel measurement of the neutron magnetic form factor from A=3 mirror nuclei </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Santiesteban%2C+S+N">S. N. Santiesteban</a>, <a href="/search/nucl-ex?searchtype=author&query=Li%2C+S">S. Li</a>, <a href="/search/nucl-ex?searchtype=author&query=Abrams%2C+D">D. Abrams</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=Arrington%2C+J">J. Arrington</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=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=Barrow%2C+J">J. Barrow</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+A">A. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellini%2C+V">V. Bellini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhatt%2C+H">H. Bhatt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhetuwal%2C+D">D. Bhetuwal</a>, <a href="/search/nucl-ex?searchtype=author&query=Biswas%2C+D">D. Biswas</a>, <a href="/search/nucl-ex?searchtype=author&query=Camsonne%2C+A">A. Camsonne</a>, <a href="/search/nucl-ex?searchtype=author&query=Castellanos%2C+J">J. Castellanos</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+J">J. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+J">J-P. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chrisman%2C+D">D. Chrisman</a>, <a href="/search/nucl-ex?searchtype=author&query=Christy%2C+M+E">M. E. Christy</a>, <a href="/search/nucl-ex?searchtype=author&query=Clarke%2C+C">C. Clarke</a>, <a href="/search/nucl-ex?searchtype=author&query=Covrig%2C+S">S. Covrig</a> , et al. (81 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="2304.13770v2-abstract-short" style="display: inline;"> The electromagnetic form factors of the proton and neutron encode information on the spatial structure of their charge and magnetization distributions. While measurements of the proton are relatively straightforward, the lack of a free neutron target makes measurements of the neutron's electromagnetic structure more challenging and more sensitive to experimental or model-dependent uncertainties. V… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.13770v2-abstract-full').style.display = 'inline'; document.getElementById('2304.13770v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2304.13770v2-abstract-full" style="display: none;"> The electromagnetic form factors of the proton and neutron encode information on the spatial structure of their charge and magnetization distributions. While measurements of the proton are relatively straightforward, the lack of a free neutron target makes measurements of the neutron's electromagnetic structure more challenging and more sensitive to experimental or model-dependent uncertainties. Various experiments have attempted to extract the neutron form factors from scattering from the neutron in deuterium, with different techniques providing different, and sometimes large, systematic uncertainties. We present results from a novel measurement of the neutron magnetic form factor using quasielastic scattering from the mirror nuclei $^3$H and $^3$He, where the nuclear effects are larger than for deuterium but expected to largely cancel in the cross-section ratios. We extracted values of the neutron magnetic form factor for low-to-modest momentum transfer, $0.6<Q^2<2.9$ GeV$^2$, where existing measurements give inconsistent results. The precision and $Q^2$ range of this data allow for a better understanding of the current world's data, and suggest a path toward further improvement of our overall understanding of the neutron's magnetic form factor. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.13770v2-abstract-full').style.display = 'none'; document.getElementById('2304.13770v2-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 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 April, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 132, 162501 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2304.10058">arXiv:2304.10058</a> <span> [<a href="https://arxiv.org/pdf/2304.10058">pdf</a>, <a href="https://arxiv.org/format/2304.10058">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"> Direct Comparison of using a Z-Transformation instead of the traditional $Q^2$ for for Extraction of the Proton Radius from $e-p$ Scattering Data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Hague%2C+T+J">Tyler J. Hague</a>, <a href="/search/nucl-ex?searchtype=author&query=Higinbotham%2C+D+W">Douglas W. Higinbotham</a>, <a href="/search/nucl-ex?searchtype=author&query=Portuese%2C+S">Spencer Portuese</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="2304.10058v2-abstract-short" style="display: inline;"> A discrepancy in the determination of the proton's charge radius, $r_p$, between muonic hydrogen spectroscopy versus classic atomic spectroscopy and electron scattering data has become known as the proton radius puzzle. Extractions of $r_p$ from electron scattering data require determination of the slope of the proton's charge form factor, $G_E^p$, in the limit of $Q^2\rightarrow0$ through fitting… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.10058v2-abstract-full').style.display = 'inline'; document.getElementById('2304.10058v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2304.10058v2-abstract-full" style="display: none;"> A discrepancy in the determination of the proton's charge radius, $r_p$, between muonic hydrogen spectroscopy versus classic atomic spectroscopy and electron scattering data has become known as the proton radius puzzle. Extractions of $r_p$ from electron scattering data require determination of the slope of the proton's charge form factor, $G_E^p$, in the limit of $Q^2\rightarrow0$ through fitting and extrapolation. Some works have presented the $Z$-transformation fitting technique as the best choice for this type of extraction due to the true functional form of $G_E^p$ being mathematically guaranteed to exist within the parameter-space of the fit function. In this work, we test this claim by examining the mathematical bias and variances introduced by this technique as compared to the more traditional $Q^2$ fits using statistically sampled $G_E^p$ parameterizations with known input radii. Our tests conclude that the quality of the $Z$-transformation technique depends on the range of data used. In the case of new experiments, the fit function and technique should be selected in advance by generating realistic pseudodata and assessing the power of different techniques. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.10058v2-abstract-full').style.display = 'none'; document.getElementById('2304.10058v2-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> 4 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 April, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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">15 figures in main article, 90 figures in the supplemental materials 11 pages in the main article 33 pages in the supplemental materials textual descriptions of all figures available in the supplemental materials</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.02579">arXiv:2303.02579</a> <span> [<a href="https://arxiv.org/pdf/2303.02579">pdf</a>, <a href="https://arxiv.org/format/2303.02579">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> <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.2024.122874">10.1016/j.nuclphysa.2024.122874 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Present and Future of QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <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=Afzal%2C+F">F. Afzal</a>, <a href="/search/nucl-ex?searchtype=author&query=Aidala%2C+C+A">C. A. Aidala</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=Almaalol%2C+D+K">D. K. Almaalol</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+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=Aschenauer%2C+E+C">E. C. Aschenauer</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=Barish%2C+K+N">K. N. Barish</a>, <a href="/search/nucl-ex?searchtype=author&query=Barnea%2C+N">N. Barnea</a>, <a href="/search/nucl-ex?searchtype=author&query=Basar%2C+G">G. Basar</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Baty%2C+A+A">A. A. Baty</a>, <a href="/search/nucl-ex?searchtype=author&query=Bautista%2C+I">I. Bautista</a> , et al. (378 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="2303.02579v1-abstract-short" style="display: inline;"> This White Paper presents the community inputs and scientific conclusions from the Hot and Cold QCD Town Meeting that took place September 23-25, 2022 at MIT, as part of the Nuclear Science Advisory Committee (NSAC) 2023 Long Range Planning process. A total of 424 physicists registered for the meeting. The meeting highlighted progress in Quantum Chromodynamics (QCD) nuclear physics since the 2015… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.02579v1-abstract-full').style.display = 'inline'; document.getElementById('2303.02579v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.02579v1-abstract-full" style="display: none;"> This White Paper presents the community inputs and scientific conclusions from the Hot and Cold QCD Town Meeting that took place September 23-25, 2022 at MIT, as part of the Nuclear Science Advisory Committee (NSAC) 2023 Long Range Planning process. A total of 424 physicists registered for the meeting. The meeting highlighted progress in Quantum Chromodynamics (QCD) nuclear physics since the 2015 LRP (LRP15) and identified key questions and plausible paths to obtaining answers to those questions, defining priorities for our research over the coming decade. In defining the priority of outstanding physics opportunities for the future, both prospects for the short (~ 5 years) and longer term (5-10 years and beyond) are identified together with the facilities, personnel and other resources needed to maximize the discovery potential and maintain United States leadership in QCD physics worldwide. This White Paper is organized as follows: In the Executive Summary, we detail the Recommendations and Initiatives that were presented and discussed at the Town Meeting, and their supporting rationales. Section 2 highlights major progress and accomplishments of the past seven years. It is followed, in Section 3, by an overview of the physics opportunities for the immediate future, and in relation with the next QCD frontier: the EIC. Section 4 provides an overview of the physics motivations and goals associated with the EIC. Section 5 is devoted to the workforce development and support of diversity, equity and inclusion. This is followed by a dedicated section on computing in Section 6. Section 7 describes the national need for nuclear data science and the relevance to QCD research. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.02579v1-abstract-full').style.display = 'none'; document.getElementById('2303.02579v1-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> 4 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">QCD Town Meeting White Paper, as submitted to 2023 NSAC LRP committee on Feb. 28, 2023</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Phys.A 1047 (2024) 122874 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.04372">arXiv:2210.04372</a> <span> [<a href="https://arxiv.org/pdf/2210.04372">pdf</a>, <a href="https://arxiv.org/format/2210.04372">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</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> </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.107.065203">10.1103/PhysRevC.107.065203 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Physical Implications of the Extrapolation and Statistical Bootstrap of the Nucleon Structure Function Ratio $\frac{F_2^n}{F_2^p}$ for Mirror Nuclei $^3$He and $^3$H </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Valenty%2C+H">Hannah Valenty</a>, <a href="/search/nucl-ex?searchtype=author&query=West%2C+J+R">Jennifer Rittenhouse West</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">Fatiha Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=Higinbotham%2C+D+W">Douglas W. Higinbotham</a>, <a href="/search/nucl-ex?searchtype=author&query=Parker%2C+A">Asia Parker</a>, <a href="/search/nucl-ex?searchtype=author&query=Seroka%2C+E">Erin Seroka</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="2210.04372v2-abstract-short" style="display: inline;"> A nuclear physics example of statistical bootstrap is used on the MARATHON data nucleon structure function ratio, $\frac{F_2^n}{F_2^p}$, in the quark momentum fraction $x_B\rightarrow0$ and $x_B\rightarrow1$ regions. The extrapolated $F_2$ ratio value as quark momentum fraction $x_B\rightarrow 1$ approaches 0.4 and this value is compared to theoretical predictions. The extrapolated ratio when… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.04372v2-abstract-full').style.display = 'inline'; document.getElementById('2210.04372v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.04372v2-abstract-full" style="display: none;"> A nuclear physics example of statistical bootstrap is used on the MARATHON data nucleon structure function ratio, $\frac{F_2^n}{F_2^p}$, in the quark momentum fraction $x_B\rightarrow0$ and $x_B\rightarrow1$ regions. The extrapolated $F_2$ ratio value as quark momentum fraction $x_B\rightarrow 1$ approaches 0.4 and this value is compared to theoretical predictions. The extrapolated ratio when $x_B\rightarrow 0$ favors the simple model of isospin symmetry with the complete dominance of seaquarks at low momentum fraction. At high-$x_B$, the proton quark distribution function ratio $d/u$ is derived from the $x\rightarrow 1$ ratio $\frac{F_2^n}{F_2^p}\rightarrow 0.4$ and found to be $d/u \rightarrow 1/6$. Our extrapolated values for both the $\frac{F_2^n}{F_2^p}$ ratio and the $d/u$ parton distribution function ratio most closely match perturbative QCD values from quark counting and helicity conservation arguments but still differ by roughly $7\%$. The mismatch to theoretical predictions may be ameliorated if two compatible models act simultaneously in the nucleon wavefunction. One such example is nucleon wavefunctions composed of a linear combination of a quark-diquark state and a 3-valence quark correlated state with coefficients that combine to give the extrapolated $F_2$ ratio of $0.4$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.04372v2-abstract-full').style.display = 'none'; document.getElementById('2210.04372v2-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 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.04189">arXiv:2210.04189</a> <span> [<a href="https://arxiv.org/pdf/2210.04189">pdf</a>, <a href="https://arxiv.org/format/2210.04189">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="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/s41586-022-05007-2">10.1038/s41586-022-05007-2 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Revealing the short-range structure of the "mirror nuclei" $^3$H and $^3$He </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Li%2C+S">S. Li</a>, <a href="/search/nucl-ex?searchtype=author&query=Cruz-Torres%2C+R">R. Cruz-Torres</a>, <a href="/search/nucl-ex?searchtype=author&query=Santiesteban%2C+N">N. Santiesteban</a>, <a href="/search/nucl-ex?searchtype=author&query=Ye%2C+Z+H">Z. H. Ye</a>, <a href="/search/nucl-ex?searchtype=author&query=Abrams%2C+D">D. Abrams</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=Arrington%2C+J">J. Arrington</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=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=Barrow%2C+J">J. Barrow</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+A">A. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellini%2C+V">V. Bellini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhatt%2C+H">H. Bhatt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhetuwal%2C+D">D. Bhetuwal</a>, <a href="/search/nucl-ex?searchtype=author&query=Biswas%2C+D">D. Biswas</a>, <a href="/search/nucl-ex?searchtype=author&query=Bulumulla%2C+D">D. Bulumulla</a>, <a href="/search/nucl-ex?searchtype=author&query=Camsonne%2C+A">A. Camsonne</a>, <a href="/search/nucl-ex?searchtype=author&query=Castellanos%2C+J">J. Castellanos</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+J">J. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+J">J-P. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chrisman%2C+D">D. Chrisman</a> , et al. (91 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="2210.04189v1-abstract-short" style="display: inline;"> When protons and neutrons (nucleons) are bound into atomic nuclei, they are close enough together to feel significant attraction, or repulsion, from the strong, short-distance part of the nucleon-nucleon interaction. These strong interactions lead to hard collisions between nucleons, generating pairs of highly-energetic nucleons referred to as short-range correlations (SRCs). SRCs are an important… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.04189v1-abstract-full').style.display = 'inline'; document.getElementById('2210.04189v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.04189v1-abstract-full" style="display: none;"> When protons and neutrons (nucleons) are bound into atomic nuclei, they are close enough together to feel significant attraction, or repulsion, from the strong, short-distance part of the nucleon-nucleon interaction. These strong interactions lead to hard collisions between nucleons, generating pairs of highly-energetic nucleons referred to as short-range correlations (SRCs). SRCs are an important but relatively poorly understood part of nuclear structure and mapping out the strength and isospin structure (neutron-proton vs proton-proton pairs) of these virtual excitations is thus critical input for modeling a range of nuclear, particle, and astrophysics measurements. Hitherto measurements used two-nucleon knockout or ``triple-coincidence'' reactions to measure the relative contribution of np- and pp-SRCs by knocking out a proton from the SRC and detecting its partner nucleon (proton or neutron). These measurementsshow that SRCs are almost exclusively np pairs, but had limited statistics and required large model-dependent final-state interaction (FSI) corrections. We report on the first measurement using inclusive scattering from the mirror nuclei $^3$H and $^3$He to extract the np/pp ratio of SRCs in the A=3 system. We obtain a measure of the np/pp SRC ratio that is an order of magnitude more precise than previous experiments, and find a dramatic deviation from the near-total np dominance observed in heavy nuclei. This result implies an unexpected structure in the high-momentum wavefunction for $^3$He and $^3$H. Understanding these results will improve our understanding of the short-range part of the N-N interaction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.04189v1-abstract-full').style.display = 'none'; document.getElementById('2210.04189v1-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 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">Journal ref:</span> Nature 609, 41-45 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2209.14108">arXiv:2209.14108</a> <span> [<a href="https://arxiv.org/pdf/2209.14108">pdf</a>, <a href="https://arxiv.org/format/2209.14108">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="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/PhysRevD.107.012005">10.1103/PhysRevD.107.012005 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Determination of the titanium spectral function from (e,e'p) data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Jiang%2C+L">L. Jiang</a>, <a href="/search/nucl-ex?searchtype=author&query=Ankowski%2C+A+M">A. M. Ankowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Abrams%2C+D">D. Abrams</a>, <a href="/search/nucl-ex?searchtype=author&query=Gu%2C+L">L. Gu</a>, <a href="/search/nucl-ex?searchtype=author&query=Aljawrneh%2C+B">B. Aljawrneh</a>, <a href="/search/nucl-ex?searchtype=author&query=Alsalmi%2C+S">S. Alsalmi</a>, <a href="/search/nucl-ex?searchtype=author&query=Bane%2C+J">J. Bane</a>, <a href="/search/nucl-ex?searchtype=author&query=Batz%2C+A">A. Batz</a>, <a href="/search/nucl-ex?searchtype=author&query=Barcus%2C+S">S. Barcus</a>, <a href="/search/nucl-ex?searchtype=author&query=Barroso%2C+M">M. Barroso</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellini%2C+V">V. Bellini</a>, <a href="/search/nucl-ex?searchtype=author&query=Benhar%2C+O">O. Benhar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bericic%2C+J">J. Bericic</a>, <a href="/search/nucl-ex?searchtype=author&query=Biswas%2C+D">D. Biswas</a>, <a href="/search/nucl-ex?searchtype=author&query=Camsonne%2C+A">A. Camsonne</a>, <a href="/search/nucl-ex?searchtype=author&query=Castellanos%2C+J">J. Castellanos</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+J+-">J. -P. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Christy%2C+M+E">M. E. Christy</a>, <a href="/search/nucl-ex?searchtype=author&query=Craycraft%2C+K">K. Craycraft</a>, <a href="/search/nucl-ex?searchtype=author&query=Cruz-Torres%2C+R">R. Cruz-Torres</a>, <a href="/search/nucl-ex?searchtype=author&query=Dai%2C+H">H. Dai</a>, <a href="/search/nucl-ex?searchtype=author&query=Day%2C+D">D. Day</a>, <a href="/search/nucl-ex?searchtype=author&query=Dirican%2C+A">A. Dirican</a>, <a href="/search/nucl-ex?searchtype=author&query=Dusa%2C+S+-">S. -C. Dusa</a>, <a href="/search/nucl-ex?searchtype=author&query=Fuchey%2C+E">E. Fuchey</a> , et al. (40 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="2209.14108v2-abstract-short" style="display: inline;"> The E12-14-012 experiment, performed in Jefferson Lab Hall A, has measured the (e,e'p) cross section in parallel kinematics using a natural titanium target. Here, we report the full results of the analysis of the data set corresponding to beam energy 2.2 GeV, and spanning the missing momentum and missing energy range 15 <= pm <= 250 MeV/c and 12 <= Em <= 80 MeV. The reduced cross section has been… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.14108v2-abstract-full').style.display = 'inline'; document.getElementById('2209.14108v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.14108v2-abstract-full" style="display: none;"> The E12-14-012 experiment, performed in Jefferson Lab Hall A, has measured the (e,e'p) cross section in parallel kinematics using a natural titanium target. Here, we report the full results of the analysis of the data set corresponding to beam energy 2.2 GeV, and spanning the missing momentum and missing energy range 15 <= pm <= 250 MeV/c and 12 <= Em <= 80 MeV. The reduced cross section has been measured with ~7% accuracy as function of both missing momentum and missing energy. We compared our data to the results of a Monte Carlo simulations performed using a model spectral function and including the effects of final state interactions. The overall agreement between data and simulations is quite good (chi2/d.o.f. = 0.9). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.14108v2-abstract-full').style.display = 'none'; document.getElementById('2209.14108v2-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 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 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, published in Phys. Rev. D. arXiv admin note: substantial text overlap with arXiv:2203.01748</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 107, 012005, 2023 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2209.11838">arXiv:2209.11838</a> <span> [<a href="https://arxiv.org/pdf/2209.11838">pdf</a>, <a href="https://arxiv.org/format/2209.11838">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"> Jefferson Lab Hall C: Precision Physics at the Luminosity Frontier </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Benesch%2C+J">J. Benesch</a>, <a href="/search/nucl-ex?searchtype=author&query=Berdnikov%2C+V">V. Berdnikov</a>, <a href="/search/nucl-ex?searchtype=author&query=Brindza%2C+P">P. Brindza</a>, <a href="/search/nucl-ex?searchtype=author&query=Dusa%2C+S+C">S. Covrig Dusa</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutta%2C+D">D. Dutta</a>, <a href="/search/nucl-ex?searchtype=author&query=Gaskell%2C+D">D. Gaskell</a>, <a href="/search/nucl-ex?searchtype=author&query=Gogami%2C+T">T. Gogami</a>, <a href="/search/nucl-ex?searchtype=author&query=Grames%2C+J+M">J. M. Grames</a>, <a href="/search/nucl-ex?searchtype=author&query=Hamilton%2C+D+J">D. J. Hamilton</a>, <a href="/search/nucl-ex?searchtype=author&query=Higinbotham%2C+D+W">D. W. Higinbotham</a>, <a href="/search/nucl-ex?searchtype=author&query=Horn%2C+T">T. Horn</a>, <a href="/search/nucl-ex?searchtype=author&query=Huber%2C+G+M">G. M. Huber</a>, <a href="/search/nucl-ex?searchtype=author&query=Jones%2C+M+K">M. K. Jones</a>, <a href="/search/nucl-ex?searchtype=author&query=Keith%2C+C">C. Keith</a>, <a href="/search/nucl-ex?searchtype=author&query=Keppel%2C+C">C. Keppel</a>, <a href="/search/nucl-ex?searchtype=author&query=Kinney%2C+E+R">E. R. Kinney</a>, <a href="/search/nucl-ex?searchtype=author&query=Li%2C+W+B">W. B. Li</a>, <a href="/search/nucl-ex?searchtype=author&query=Li%2C+S">Shujie Li</a>, <a href="/search/nucl-ex?searchtype=author&query=Liyanage%2C+N">N. Liyanage</a>, <a href="/search/nucl-ex?searchtype=author&query=Long%2C+E">E. Long</a>, <a href="/search/nucl-ex?searchtype=author&query=Mack%2C+D+J">D. J. Mack</a>, <a href="/search/nucl-ex?searchtype=author&query=Metzger%2C+B">B. Metzger</a>, <a href="/search/nucl-ex?searchtype=author&query=Camacho%2C+C+M">C. Mu帽oz Camacho</a>, <a href="/search/nucl-ex?searchtype=author&query=Nakamura%2C+S+N">S. N. Nakamura</a>, <a href="/search/nucl-ex?searchtype=author&query=Sawatzky%2C+B">B. Sawatzky</a> , et al. (6 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="2209.11838v1-abstract-short" style="display: inline;"> Over the last three decades, Hall C has been a key contributor to progress in the understanding of hadron structure and interactions. An outline of a potential future Hall C physics program focused on precision measurements of small cross sections is presented. A detailed overview of this unique facility, whose flexible configuration allows many opportunities for new experimental equipment that he… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.11838v1-abstract-full').style.display = 'inline'; document.getElementById('2209.11838v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.11838v1-abstract-full" style="display: none;"> Over the last three decades, Hall C has been a key contributor to progress in the understanding of hadron structure and interactions. An outline of a potential future Hall C physics program focused on precision measurements of small cross sections is presented. A detailed overview of this unique facility, whose flexible configuration allows many opportunities for new experimental equipment that help address a wide range of questions in hadronic physics, is included as well. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.11838v1-abstract-full').style.display = 'none'; document.getElementById('2209.11838v1-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 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 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">67 pages, 20 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/2208.14575">arXiv:2208.14575</a> <span> [<a href="https://arxiv.org/pdf/2208.14575">pdf</a>, <a href="https://arxiv.org/format/2208.14575">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="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.2023.168238">10.1016/j.nima.2023.168238 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Detector Requirements and Simulation Results for the EIC Exclusive, Diffractive and Tagging Physics Program using the ECCE Detector Concept </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Bylinkin%2C+A">A. Bylinkin</a>, <a href="/search/nucl-ex?searchtype=author&query=Dean%2C+C+T">C. T. Dean</a>, <a href="/search/nucl-ex?searchtype=author&query=Fegan%2C+S">S. Fegan</a>, <a href="/search/nucl-ex?searchtype=author&query=Gangadharan%2C+D">D. Gangadharan</a>, <a href="/search/nucl-ex?searchtype=author&query=Gates%2C+K">K. Gates</a>, <a href="/search/nucl-ex?searchtype=author&query=Kay%2C+S+J+D">S. J. D. Kay</a>, <a href="/search/nucl-ex?searchtype=author&query=Korover%2C+I">I. Korover</a>, <a href="/search/nucl-ex?searchtype=author&query=Li%2C+W+B">W. B. Li</a>, <a href="/search/nucl-ex?searchtype=author&query=Li%2C+X">X. Li</a>, <a href="/search/nucl-ex?searchtype=author&query=Montgomery%2C+R">R. Montgomery</a>, <a href="/search/nucl-ex?searchtype=author&query=Nguyen%2C+D">D. Nguyen</a>, <a href="/search/nucl-ex?searchtype=author&query=Penman%2C+G">G. Penman</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=Santiesteban%2C+N">N. Santiesteban</a>, <a href="/search/nucl-ex?searchtype=author&query=Trotta%2C+R">R. Trotta</a>, <a href="/search/nucl-ex?searchtype=author&query=Usman%2C+A">A. Usman</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=Frantz%2C+J">J. Frantz</a>, <a href="/search/nucl-ex?searchtype=author&query=Glazier%2C+D+I">D. I. Glazier</a>, <a href="/search/nucl-ex?searchtype=author&query=Higinbotham%2C+D+W">D. W. Higinbotham</a>, <a href="/search/nucl-ex?searchtype=author&query=Horn%2C+T">T. Horn</a>, <a href="/search/nucl-ex?searchtype=author&query=Huang%2C+J">J. Huang</a>, <a href="/search/nucl-ex?searchtype=author&query=Huber%2C+G">G. Huber</a>, <a href="/search/nucl-ex?searchtype=author&query=Reed%2C+R">R. Reed</a>, <a href="/search/nucl-ex?searchtype=author&query=Roche%2C+J">J. Roche</a> , et al. (258 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="2208.14575v2-abstract-short" style="display: inline;"> This article presents a collection of simulation studies using the ECCE detector concept in the context of the EIC's exclusive, diffractive, and tagging physics program, which aims to further explore the rich quark-gluon structure of nucleons and nuclei. To successfully execute the program, ECCE proposed to utilize the detecter system close to the beamline to ensure exclusivity and tag ion beam/fr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.14575v2-abstract-full').style.display = 'inline'; document.getElementById('2208.14575v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2208.14575v2-abstract-full" style="display: none;"> This article presents a collection of simulation studies using the ECCE detector concept in the context of the EIC's exclusive, diffractive, and tagging physics program, which aims to further explore the rich quark-gluon structure of nucleons and nuclei. To successfully execute the program, ECCE proposed to utilize the detecter system close to the beamline to ensure exclusivity and tag ion beam/fragments for a particular reaction of interest. Preliminary studies confirmed the proposed technology and design satisfy the requirements. The projected physics impact results are based on the projected detector performance from the simulation at 10 or 100 fb^-1 of integrated luminosity. Additionally, a few insights on the potential 2nd Interaction Region can (IR) were also documented which could serve as a guidepost for the future development of a second EIC detector. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.14575v2-abstract-full').style.display = 'none'; document.getElementById('2208.14575v2-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 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 August, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.10632">arXiv:2207.10632</a> <span> [<a href="https://arxiv.org/pdf/2207.10632">pdf</a>, <a href="https://arxiv.org/format/2207.10632">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> <p class="title is-5 mathjax"> Open Heavy Flavor Studies for the ECCE Detector at the Electron Ion Collider </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Li%2C+X">X. Li</a>, <a href="/search/nucl-ex?searchtype=author&query=Adkins%2C+J+K">J. K. Adkins</a>, <a href="/search/nucl-ex?searchtype=author&query=Akiba%2C+Y">Y. Akiba</a>, <a href="/search/nucl-ex?searchtype=author&query=Albataineh%2C+A">A. Albataineh</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M">M. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Arsene%2C+I+C">I. C. Arsene</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=Bae%2C+J">J. Bae</a>, <a href="/search/nucl-ex?searchtype=author&query=Bai%2C+X">X. Bai</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=Bashkanov%2C+M">M. Bashkanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellwied%2C+R">R. Bellwied</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. 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=Bock%2C+F">F. Bock</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W">W. Boeglin</a>, <a href="/search/nucl-ex?searchtype=author&query=Borysova%2C+M">M. Borysova</a>, <a href="/search/nucl-ex?searchtype=author&query=Brash%2C+E">E. Brash</a>, <a href="/search/nucl-ex?searchtype=author&query=Brindza%2C+P">P. Brindza</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+M">M. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Bueltmann%2C+S">S. Bueltmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Bukhari%2C+M+H+S">M. H. S. Bukhari</a>, <a href="/search/nucl-ex?searchtype=author&query=Bylinkin%2C+A">A. Bylinkin</a> , et al. (262 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="2207.10632v2-abstract-short" style="display: inline;"> The ECCE detector has been recommended as the selected reference detector for the future Electron-Ion Collider (EIC). A series of simulation studies have been carried out to validate the physics feasibility of the ECCE detector. In this paper, detailed studies of heavy flavor hadron and jet reconstruction and physics projections with the ECCE detector performance and different magnet options will… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.10632v2-abstract-full').style.display = 'inline'; document.getElementById('2207.10632v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.10632v2-abstract-full" style="display: none;"> The ECCE detector has been recommended as the selected reference detector for the future Electron-Ion Collider (EIC). A series of simulation studies have been carried out to validate the physics feasibility of the ECCE detector. In this paper, detailed studies of heavy flavor hadron and jet reconstruction and physics projections with the ECCE detector performance and different magnet options will be presented. The ECCE detector has enabled precise EIC heavy flavor hadron and jet measurements with a broad kinematic coverage. These proposed heavy flavor measurements will help systematically study the hadronization process in vacuum and nuclear medium especially in the underexplored kinematic region. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.10632v2-abstract-full').style.display = 'none'; document.getElementById('2207.10632v2-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 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 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">Open heavy flavor studies with the EIC reference detector design by the ECCE consortium. 11 pages, 11 figures, to be submitted to the Nuclear Instruments and Methods A</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> LANL report number: LA-UR-22-27181 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.10356">arXiv:2207.10356</a> <span> [<a href="https://arxiv.org/pdf/2207.10356">pdf</a>, <a href="https://arxiv.org/format/2207.10356">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="Instrumentation and Detectors">physics.ins-det</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.2022.167956">10.1016/j.nima.2022.167956 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Exclusive J/$蠄$ Detection and Physics with ECCE </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Li%2C+X">X. Li</a>, <a href="/search/nucl-ex?searchtype=author&query=Adkins%2C+J+K">J. K. Adkins</a>, <a href="/search/nucl-ex?searchtype=author&query=Akiba%2C+Y">Y. Akiba</a>, <a href="/search/nucl-ex?searchtype=author&query=Albataineh%2C+A">A. Albataineh</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M">M. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Arsene%2C+I+C">I. C. Arsene</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=Bae%2C+J">J. Bae</a>, <a href="/search/nucl-ex?searchtype=author&query=Bai%2C+X">X. Bai</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=Bashkanov%2C+M">M. Bashkanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellwied%2C+R">R. Bellwied</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. 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=Bock%2C+F">F. Bock</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W">W. Boeglin</a>, <a href="/search/nucl-ex?searchtype=author&query=Borysova%2C+M">M. Borysova</a>, <a href="/search/nucl-ex?searchtype=author&query=Brash%2C+E">E. Brash</a>, <a href="/search/nucl-ex?searchtype=author&query=Brindza%2C+P">P. Brindza</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+M">M. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Bueltmann%2C+S">S. Bueltmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Bukhari%2C+M+H+S">M. H. S. Bukhari</a>, <a href="/search/nucl-ex?searchtype=author&query=Bylinkin%2C+A">A. Bylinkin</a> , et al. (262 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="2207.10356v1-abstract-short" style="display: inline;"> Exclusive heavy quarkonium photoproduction is one of the most popular processes in EIC, which has a large cross section and a simple final state. Due to the gluonic nature of the exchange Pomeron, this process can be related to the gluon distributions in the nucleus. The momentum transfer dependence of this process is sensitive to the interaction sites, which provides a powerful tool to probe the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.10356v1-abstract-full').style.display = 'inline'; document.getElementById('2207.10356v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.10356v1-abstract-full" style="display: none;"> Exclusive heavy quarkonium photoproduction is one of the most popular processes in EIC, which has a large cross section and a simple final state. Due to the gluonic nature of the exchange Pomeron, this process can be related to the gluon distributions in the nucleus. The momentum transfer dependence of this process is sensitive to the interaction sites, which provides a powerful tool to probe the spatial distribution of gluons in the nucleus. Recently the problem of the origin of hadron mass has received lots of attention in determining the anomaly contribution $M_{a}$. The trace anomaly is sensitive to the gluon condensate, and exclusive production of quarkonia such as J/$蠄$ and $违$ can serve as a sensitive probe to constrain it. In this paper, we present the performance of the ECCE detector for exclusive J/$蠄$ detection and the capability of this process to investigate the above physics opportunities with ECCE. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.10356v1-abstract-full').style.display = 'none'; document.getElementById('2207.10356v1-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 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">11 pages, 14 figures, 1 table</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.09437">arXiv:2207.09437</a> <span> [<a href="https://arxiv.org/pdf/2207.09437">pdf</a>, <a href="https://arxiv.org/format/2207.09437">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.2023.168464">10.1016/j.nima.2023.168464 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Design and Simulated Performance of Calorimetry Systems for the ECCE Detector at the Electron Ion Collider </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Bock%2C+F">F. Bock</a>, <a href="/search/nucl-ex?searchtype=author&query=Schmidt%2C+N">N. Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Wang%2C+P+K">P. K. Wang</a>, <a href="/search/nucl-ex?searchtype=author&query=Santiesteban%2C+N">N. Santiesteban</a>, <a href="/search/nucl-ex?searchtype=author&query=Horn%2C+T">T. Horn</a>, <a href="/search/nucl-ex?searchtype=author&query=Huang%2C+J">J. Huang</a>, <a href="/search/nucl-ex?searchtype=author&query=Lajoie%2C+J">J. Lajoie</a>, <a href="/search/nucl-ex?searchtype=author&query=Camacho%2C+C+M">C. Munoz Camacho</a>, <a href="/search/nucl-ex?searchtype=author&query=Adkins%2C+J+K">J. K. Adkins</a>, <a href="/search/nucl-ex?searchtype=author&query=Akiba%2C+Y">Y. Akiba</a>, <a href="/search/nucl-ex?searchtype=author&query=Albataineh%2C+A">A. Albataineh</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M">M. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Arsene%2C+I+C">I. C. Arsene</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=Bae%2C+J">J. Bae</a>, <a href="/search/nucl-ex?searchtype=author&query=Bai%2C+X">X. Bai</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=Bashkanov%2C+M">M. Bashkanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellwied%2C+R">R. Bellwied</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. 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=Boeglin%2C+W">W. Boeglin</a>, <a href="/search/nucl-ex?searchtype=author&query=Borysova%2C+M">M. Borysova</a>, <a href="/search/nucl-ex?searchtype=author&query=Brash%2C+E">E. Brash</a> , et al. (263 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="2207.09437v1-abstract-short" style="display: inline;"> We describe the design and performance the calorimeter systems used in the ECCE detector design to achieve the overall performance specifications cost-effectively with careful consideration of appropriate technical and schedule risks. The calorimeter systems consist of three electromagnetic calorimeters, covering the combined pseudorapdity range from -3.7 to 3.8 and two hadronic calorimeters. Key… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.09437v1-abstract-full').style.display = 'inline'; document.getElementById('2207.09437v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.09437v1-abstract-full" style="display: none;"> We describe the design and performance the calorimeter systems used in the ECCE detector design to achieve the overall performance specifications cost-effectively with careful consideration of appropriate technical and schedule risks. The calorimeter systems consist of three electromagnetic calorimeters, covering the combined pseudorapdity range from -3.7 to 3.8 and two hadronic calorimeters. Key calorimeter performances which include energy and position resolutions, reconstruction efficiency, and particle identification will be presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.09437v1-abstract-full').style.display = 'none'; document.getElementById('2207.09437v1-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 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">19 pages, 22 figures, 5 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2205.09185">arXiv:2205.09185</a> <span> [<a href="https://arxiv.org/pdf/2205.09185">pdf</a>, <a href="https://arxiv.org/format/2205.09185">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="Machine Learning">cs.LG</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> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-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.nima.2022.167748">10.1016/j.nima.2022.167748 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> AI-assisted Optimization of the ECCE Tracking System at the Electron Ion Collider </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Fanelli%2C+C">C. Fanelli</a>, <a href="/search/nucl-ex?searchtype=author&query=Papandreou%2C+Z">Z. Papandreou</a>, <a href="/search/nucl-ex?searchtype=author&query=Suresh%2C+K">K. Suresh</a>, <a href="/search/nucl-ex?searchtype=author&query=Adkins%2C+J+K">J. K. Adkins</a>, <a href="/search/nucl-ex?searchtype=author&query=Akiba%2C+Y">Y. Akiba</a>, <a href="/search/nucl-ex?searchtype=author&query=Albataineh%2C+A">A. Albataineh</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M">M. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Arsene%2C+I+C">I. C. Arsene</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=Bae%2C+J">J. Bae</a>, <a href="/search/nucl-ex?searchtype=author&query=Bai%2C+X">X. Bai</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=Bashkanov%2C+M">M. Bashkanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellwied%2C+R">R. Bellwied</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. 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=Bock%2C+F">F. Bock</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W">W. Boeglin</a>, <a href="/search/nucl-ex?searchtype=author&query=Borysova%2C+M">M. Borysova</a>, <a href="/search/nucl-ex?searchtype=author&query=Brash%2C+E">E. Brash</a>, <a href="/search/nucl-ex?searchtype=author&query=Brindza%2C+P">P. Brindza</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+M">M. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Bueltmann%2C+S">S. Bueltmann</a> , et al. (258 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="2205.09185v2-abstract-short" style="display: inline;"> The Electron-Ion Collider (EIC) is a cutting-edge accelerator facility that will study the nature of the "glue" that binds the building blocks of the visible matter in the universe. The proposed experiment will be realized at Brookhaven National Laboratory in approximately 10 years from now, with detector design and R&D currently ongoing. Notably, EIC is one of the first large-scale facilities to… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.09185v2-abstract-full').style.display = 'inline'; document.getElementById('2205.09185v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2205.09185v2-abstract-full" style="display: none;"> The Electron-Ion Collider (EIC) is a cutting-edge accelerator facility that will study the nature of the "glue" that binds the building blocks of the visible matter in the universe. The proposed experiment will be realized at Brookhaven National Laboratory in approximately 10 years from now, with detector design and R&D currently ongoing. Notably, EIC is one of the first large-scale facilities to leverage Artificial Intelligence (AI) already starting from the design and R&D phases. The EIC Comprehensive Chromodynamics Experiment (ECCE) is a consortium that proposed a detector design based on a 1.5T solenoid. The EIC detector proposal review concluded that the ECCE design will serve as the reference design for an EIC detector. Herein we describe a comprehensive optimization of the ECCE tracker using AI. The work required a complex parametrization of the simulated detector system. Our approach dealt with an optimization problem in a multidimensional design space driven by multiple objectives that encode the detector performance, while satisfying several mechanical constraints. We describe our strategy and show results obtained for the ECCE tracking system. The AI-assisted design is agnostic to the simulation framework and can be extended to other sub-detectors or to a system of sub-detectors to further optimize the performance of the EIC detector. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.09185v2-abstract-full').style.display = 'none'; document.getElementById('2205.09185v2-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 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">16 pages, 18 figures, 2 appendices, 3 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2205.08607">arXiv:2205.08607</a> <span> [<a href="https://arxiv.org/pdf/2205.08607">pdf</a>, <a href="https://arxiv.org/format/2205.08607">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> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-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.nima.2022.167859">10.1016/j.nima.2022.167859 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Scientific Computing Plan for the ECCE Detector at the Electron Ion Collider </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Bernauer%2C+J+C">J. C. Bernauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Dean%2C+C+T">C. T. Dean</a>, <a href="/search/nucl-ex?searchtype=author&query=Fanelli%2C+C">C. Fanelli</a>, <a href="/search/nucl-ex?searchtype=author&query=Huang%2C+J">J. Huang</a>, <a href="/search/nucl-ex?searchtype=author&query=Kauder%2C+K">K. Kauder</a>, <a href="/search/nucl-ex?searchtype=author&query=Lawrence%2C+D">D. Lawrence</a>, <a href="/search/nucl-ex?searchtype=author&query=Osborn%2C+J+D">J. D. Osborn</a>, <a href="/search/nucl-ex?searchtype=author&query=Paus%2C+C">C. Paus</a>, <a href="/search/nucl-ex?searchtype=author&query=Adkins%2C+J+K">J. K. Adkins</a>, <a href="/search/nucl-ex?searchtype=author&query=Akiba%2C+Y">Y. Akiba</a>, <a href="/search/nucl-ex?searchtype=author&query=Albataineh%2C+A">A. Albataineh</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M">M. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Arsene%2C+I+C">I. C. Arsene</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=Bae%2C+J">J. Bae</a>, <a href="/search/nucl-ex?searchtype=author&query=Bai%2C+X">X. Bai</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=Bashkanov%2C+M">M. Bashkanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellwied%2C+R">R. Bellwied</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. Berdnikov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bock%2C+F">F. Bock</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W">W. Boeglin</a>, <a href="/search/nucl-ex?searchtype=author&query=Borysova%2C+M">M. Borysova</a>, <a href="/search/nucl-ex?searchtype=author&query=Brash%2C+E">E. Brash</a> , et al. (256 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="2205.08607v1-abstract-short" style="display: inline;"> The Electron Ion Collider (EIC) is the next generation of precision QCD facility to be built at Brookhaven National Laboratory in conjunction with Thomas Jefferson National Laboratory. There are a significant number of software and computing challenges that need to be overcome at the EIC. During the EIC detector proposal development period, the ECCE consortium began identifying and addressing thes… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.08607v1-abstract-full').style.display = 'inline'; document.getElementById('2205.08607v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2205.08607v1-abstract-full" style="display: none;"> The Electron Ion Collider (EIC) is the next generation of precision QCD facility to be built at Brookhaven National Laboratory in conjunction with Thomas Jefferson National Laboratory. There are a significant number of software and computing challenges that need to be overcome at the EIC. During the EIC detector proposal development period, the ECCE consortium began identifying and addressing these challenges in the process of producing a complete detector proposal based upon detailed detector and physics simulations. In this document, the software and computing efforts to produce this proposal are discussed; furthermore, the computing and software model and resources required for the future of ECCE are described. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.08607v1-abstract-full').style.display = 'none'; document.getElementById('2205.08607v1-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> 17 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> NIMA 1047, 167859 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.01748">arXiv:2203.01748</a> <span> [<a href="https://arxiv.org/pdf/2203.01748">pdf</a>, <a href="https://arxiv.org/format/2203.01748">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/PhysRevD.105.112002">10.1103/PhysRevD.105.112002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Determination of the argon spectral function from (e,e'p) data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Jiang%2C+L">L. Jiang</a>, <a href="/search/nucl-ex?searchtype=author&query=Ankowski%2C+A+M">A. M. Ankowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Abrams%2C+D">D. Abrams</a>, <a href="/search/nucl-ex?searchtype=author&query=Gu%2C+L">L. Gu</a>, <a href="/search/nucl-ex?searchtype=author&query=Aljawrneh%2C+B">B. Aljawrneh</a>, <a href="/search/nucl-ex?searchtype=author&query=Alsalmi%2C+S">S. Alsalmi</a>, <a href="/search/nucl-ex?searchtype=author&query=Bane%2C+J">J. Bane</a>, <a href="/search/nucl-ex?searchtype=author&query=Batz%2C+A">A. Batz</a>, <a href="/search/nucl-ex?searchtype=author&query=Barcus%2C+S">S. Barcus</a>, <a href="/search/nucl-ex?searchtype=author&query=Barroso%2C+M">M. Barroso</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellini%2C+V">V. Bellini</a>, <a href="/search/nucl-ex?searchtype=author&query=Benhar%2C+O">O. Benhar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bericic%2C+J">J. Bericic</a>, <a href="/search/nucl-ex?searchtype=author&query=Biswas%2C+D">D. Biswas</a>, <a href="/search/nucl-ex?searchtype=author&query=Camsonne%2C+A">A. Camsonne</a>, <a href="/search/nucl-ex?searchtype=author&query=Castellanos%2C+J">J. Castellanos</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+J+-">J. -P. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Christy%2C+M+E">M. E. Christy</a>, <a href="/search/nucl-ex?searchtype=author&query=Craycraft%2C+K">K. Craycraft</a>, <a href="/search/nucl-ex?searchtype=author&query=Cruz-Torres%2C+R">R. Cruz-Torres</a>, <a href="/search/nucl-ex?searchtype=author&query=Dai%2C+H">H. Dai</a>, <a href="/search/nucl-ex?searchtype=author&query=Day%2C+D">D. Day</a>, <a href="/search/nucl-ex?searchtype=author&query=Dirican%2C+A">A. Dirican</a>, <a href="/search/nucl-ex?searchtype=author&query=Dusa%2C+S+-">S. -C. Dusa</a>, <a href="/search/nucl-ex?searchtype=author&query=Fuchey%2C+E">E. Fuchey</a> , et al. (38 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="2203.01748v2-abstract-short" style="display: inline;"> The E12-14-012 experiment, performed in Jefferson Lab Hall A, has measured the $(e, e'p)$ cross section in parallel kinematics using a natural argon target. Here, we report the full results of the analysis of the data set corresponding to beam energy 2.222 GeV, and spanning the missing momentum and missing energy range $15 \lesssim p_m \lesssim 300$ MeV/c and $12 \lesssim E_m \lesssim 80$ MeV. The… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.01748v2-abstract-full').style.display = 'inline'; document.getElementById('2203.01748v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.01748v2-abstract-full" style="display: none;"> The E12-14-012 experiment, performed in Jefferson Lab Hall A, has measured the $(e, e'p)$ cross section in parallel kinematics using a natural argon target. Here, we report the full results of the analysis of the data set corresponding to beam energy 2.222 GeV, and spanning the missing momentum and missing energy range $15 \lesssim p_m \lesssim 300$ MeV/c and $12 \lesssim E_m \lesssim 80$ MeV. The reduced cross section, determined as a function of $p_m$ and $E_m$ with $\approx$4\% accuracy, has been fitted using the results of Monte Carlo simulations involving a model spectral function and including the effects of final state interactions. The overall agreement between data and simulations turns out to be quite satisfactory ($蠂^2$/n.d.o.f.=1.9). The resulting spectral function will provide valuable new information, needed for the interpretation of neutrino interactions in liquid argon detectors. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.01748v2-abstract-full').style.display = 'none'; document.getElementById('2203.01748v2-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 June, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 3 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">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. D 105, 112002, Published 10 June 2022 </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/2110.09104">arXiv:2110.09104</a> <span> [<a href="https://arxiv.org/pdf/2110.09104">pdf</a>, <a href="https://arxiv.org/format/2110.09104">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="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/10.1093/ptep/ptab158">10.1093/ptep/ptab158 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The cross-section measurement for the $^3{\textrm H}(e,e'K^+)nn螞$ reaction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Suzuki%2C+K+N">K. N. Suzuki</a>, <a href="/search/nucl-ex?searchtype=author&query=Gogami%2C+T">T. Gogami</a>, <a href="/search/nucl-ex?searchtype=author&query=Pandey%2C+B">B. Pandey</a>, <a href="/search/nucl-ex?searchtype=author&query=Itabashi%2C+K">K. Itabashi</a>, <a href="/search/nucl-ex?searchtype=author&query=Nagao%2C+S">S. Nagao</a>, <a href="/search/nucl-ex?searchtype=author&query=Okuyama%2C+K">K. Okuyama</a>, <a href="/search/nucl-ex?searchtype=author&query=Nakamura%2C+S+N">S. N. Nakamura</a>, <a href="/search/nucl-ex?searchtype=author&query=Tang%2C+L">L. Tang</a>, <a href="/search/nucl-ex?searchtype=author&query=Abrams%2C+D">D. Abrams</a>, <a href="/search/nucl-ex?searchtype=author&query=Akiyama%2C+T">T. Akiyama</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=Gayoso%2C+C+A">C. Ayerbe Gayoso</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=Barrow%2C+J">J. Barrow</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellini%2C+V">V. Bellini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhatt%2C+H">H. Bhatt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhetuwal%2C+D">D. Bhetuwal</a>, <a href="/search/nucl-ex?searchtype=author&query=Biswas%2C+D">D. Biswas</a>, <a href="/search/nucl-ex?searchtype=author&query=Camsonne%2C+A">A. Camsonne</a>, <a href="/search/nucl-ex?searchtype=author&query=Castellanos%2C+J">J. Castellanos</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+J">J-P. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+J">J. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Covrig%2C+S">S. Covrig</a> , et al. (58 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="2110.09104v2-abstract-short" style="display: inline;"> The small binding energy of the hypertrition leads to predictions of non-existence of bound hypernuclei for isotriplet three-body systems such as $nn螞$. However, invariant mass spectroscopy at GSI has reported events that may be interpreted as the bound $nn螞$ state. The $nn螞$ state was sought by missing-mass spectroscopy via the $(e,e'K^+)$ reaction at Jefferson Lab's experimental Hall A. The pres… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.09104v2-abstract-full').style.display = 'inline'; document.getElementById('2110.09104v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.09104v2-abstract-full" style="display: none;"> The small binding energy of the hypertrition leads to predictions of non-existence of bound hypernuclei for isotriplet three-body systems such as $nn螞$. However, invariant mass spectroscopy at GSI has reported events that may be interpreted as the bound $nn螞$ state. The $nn螞$ state was sought by missing-mass spectroscopy via the $(e,e'K^+)$ reaction at Jefferson Lab's experimental Hall A. The present experiment has higher sensitivity to the $nn螞$-state investigation in terms of better precision by a factor of about three. The analysis shown in this article focuses on the derivation of the reaction cross-section for the $^3{\rm{H}}(纬^{*},K^+)\textrm{X}$ reaction. Events that were detected in an acceptance, where a Monte Carlo simulation could reproduce the data well ($|未p/p| < 4\%$), were analyzed to minimize the systematic uncertainty. No significant structures were observed with the acceptance cuts, and the upper limits of the production cross-section of the $nn螞$ state were obtained to be $21$ and $31~\rm{nb/sr}$ at the $90\%$ confidence level when theoretical predictions of $(-B_螞, 螕) = (0.25,0.8)$ and $(0.55, 4.7)$ MeV, respectively, were assumed. The cross-section result provides valuable information for examining the existence of $nn螞$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.09104v2-abstract-full').style.display = 'none'; document.getElementById('2110.09104v2-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 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">27 pages, 12 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Prog. Theor. Exp. Phys. 2022, 013D01 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2110.06281">arXiv:2110.06281</a> <span> [<a href="https://arxiv.org/pdf/2110.06281">pdf</a>, <a href="https://arxiv.org/format/2110.06281">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-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="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Precise Beam Energy Determination for Hall A after the CEBAF 12 GeV Upgrade </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Santiesteban%2C+S+N">S. N. Santiesteban</a>, <a href="/search/nucl-ex?searchtype=author&query=Tracy%2C+L">L. Tracy</a>, <a href="/search/nucl-ex?searchtype=author&query=Flay%2C+D">D. Flay</a>, <a href="/search/nucl-ex?searchtype=author&query=Higinbotham%2C+D+W">D. W. Higinbotham</a>, <a href="/search/nucl-ex?searchtype=author&query=Marchand%2C+D">D. Marchand</a>, <a href="/search/nucl-ex?searchtype=author&query=Vernin%2C+P">P. Vernin</a>, <a href="/search/nucl-ex?searchtype=author&query=Saha%2C+A">A Saha</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="2110.06281v2-abstract-short" style="display: inline;"> Precise and accurate measurements of the beam energy delivered to the experimental halls at the Thomas Jefferson Accelerator Facility (Jefferson Lab) is required by many experiments for proper data analysis and physics event reconstruction. During the 6 GeV era of Jefferson Lab, the energy delivered to experimental Hall A was determined to 2E-4 dE/E with multiple measurements; but after the machin… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.06281v2-abstract-full').style.display = 'inline'; document.getElementById('2110.06281v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.06281v2-abstract-full" style="display: none;"> Precise and accurate measurements of the beam energy delivered to the experimental halls at the Thomas Jefferson Accelerator Facility (Jefferson Lab) is required by many experiments for proper data analysis and physics event reconstruction. During the 6 GeV era of Jefferson Lab, the energy delivered to experimental Hall A was determined to 2E-4 dE/E with multiple measurements; but after the machine was upgraded to 12 GeV, the accelerator's beam energy calculations needed to be re-calibrated. In order to link the 6 GeV era calibrations to the 12 GeV era, the Hall A ARC energy measurement system was left unmodified. After the upgrade, this system was used to determine the absolute beam energy being delivered into Hall A and find the new calibrations for the main machine. To ensure the validity of these results, they have been cross checked using elastic scattering data as well as spin precession data. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.06281v2-abstract-full').style.display = 'none'; document.getElementById('2110.06281v2-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 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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, 8 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/2110.02557">arXiv:2110.02557</a> <span> [<a href="https://arxiv.org/pdf/2110.02557">pdf</a>, <a href="https://arxiv.org/format/2110.02557">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="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.106.065505">10.1103/PhysRevC.106.065505 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Understanding the systematic differences in extractions of the proton electric form factors at low-$Q^2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Zhou%2C+J">Jingyi Zhou</a>, <a href="/search/nucl-ex?searchtype=author&query=Khachatryan%2C+V">Vladimir Khachatryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Gao%2C+H">Haiyan Gao</a>, <a href="/search/nucl-ex?searchtype=author&query=Gorbaty%2C+S">Simon Gorbaty</a>, <a href="/search/nucl-ex?searchtype=author&query=Higinbotham%2C+D+W">Douglas W. Higinbotham</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="2110.02557v3-abstract-short" style="display: inline;"> Systematic differences exist between values of the proton's electric form factors in the low-$Q^2$ region extracted by different experimental and theoretical groups, though they are all making use of basically the same electron-proton scattering data. To try understand the source of these differences, we make use of the analytically well-behaved rational (N=1, M=1) function, a predictive function… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.02557v3-abstract-full').style.display = 'inline'; document.getElementById('2110.02557v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.02557v3-abstract-full" style="display: none;"> Systematic differences exist between values of the proton's electric form factors in the low-$Q^2$ region extracted by different experimental and theoretical groups, though they are all making use of basically the same electron-proton scattering data. To try understand the source of these differences, we make use of the analytically well-behaved rational (N=1, M=1) function, a predictive function that can be reasonably used for extrapolations at $Q^{2} \rightarrow 0$. First, we test how well this deceptively simple two-parameter function describes the extremely complex and state-of-the-art dispersively improved chiral effective field theory calculations. Second, we carry out a complete re-analysis of the 34 sets of eletron-proton elastic scattering cross-section data of the Mainz A1 Collaboration with its unconstrained 31 normalization parameters up to $Q^{2} = 0.5~{\rm (GeV/c)^{2}}$. We find that subtle shifts in the normalization parameters can result in relatively large changes in the extracted physical qualities. In conclusion, we show that by simply using a well-behaved analytic function, the apparent discrepancy between recent form-factor extractions can be resolved. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.02557v3-abstract-full').style.display = 'none'; document.getElementById('2110.02557v3-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 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">8 pages, 4 figures and 1 table</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-21-3510 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2109.14524">arXiv:2109.14524</a> <span> [<a href="https://arxiv.org/pdf/2109.14524">pdf</a>, <a href="https://arxiv.org/format/2109.14524">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="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.physletb.2022.137165">10.1016/j.physletb.2022.137165 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for a bound di-neutron by comparing $^3$He(e,e'p)d and $^3$H(e,e'p)X measurements </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Nguyen%2C+D">D. Nguyen</a>, <a href="/search/nucl-ex?searchtype=author&query=Neuburger%2C+C">C. Neuburger</a>, <a href="/search/nucl-ex?searchtype=author&query=Cruz-Torres%2C+R">R. Cruz-Torres</a>, <a href="/search/nucl-ex?searchtype=author&query=Schmidt%2C+A">A. Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Higinbotham%2C+D+W">D. W. Higinbotham</a>, <a href="/search/nucl-ex?searchtype=author&query=Kahlbow%2C+J">J. Kahlbow</a>, <a href="/search/nucl-ex?searchtype=author&query=Monaghan%2C+P">P. Monaghan</a>, <a href="/search/nucl-ex?searchtype=author&query=Piasetzky%2C+E">E. Piasetzky</a>, <a href="/search/nucl-ex?searchtype=author&query=Hen%2C+O">O. Hen</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="2109.14524v1-abstract-short" style="display: inline;"> We report on a search for a bound di-neutron by comparing electron-induced proton-knockout $(e,e'p)$ measurements from Helium-3 ($^3$He) and Tritium ($^3$H). The measurements were performed at Jefferson Lab Hall A with a 4.326 GeV electron beam, and kinematics of large momentum transfer $Q^2 \approx 1.9$ (GeV/$c$)$^2$ and $x_B>1$, to minimize contributions from non quasi-elastic (QE) reaction mech… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.14524v1-abstract-full').style.display = 'inline'; document.getElementById('2109.14524v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2109.14524v1-abstract-full" style="display: none;"> We report on a search for a bound di-neutron by comparing electron-induced proton-knockout $(e,e'p)$ measurements from Helium-3 ($^3$He) and Tritium ($^3$H). The measurements were performed at Jefferson Lab Hall A with a 4.326 GeV electron beam, and kinematics of large momentum transfer $Q^2 \approx 1.9$ (GeV/$c$)$^2$ and $x_B>1$, to minimize contributions from non quasi-elastic (QE) reaction mechanisms. Analyzing the measured $^3$He missing mass ($M_{miss}$) and missing energy ($E_{miss}$) distributions, we can distinguish the two-body break-up reaction, in which the residual proton-neutron system remains bound as a deuteron. In the $^3$H mirror case, under the exact same kinematic conditions, we do not identify a signature for a bound di-neutron with similar binding energy to that of the deuteron. We calculate exclusion limits as a function of the di-neutron binding energy and find that, for binding equivalent to the deuteron, the two-body break-up cross section on $^3$H is less than 0.9% of that on $^3$He in the measured kinematics at the 95% confidence level. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.14524v1-abstract-full').style.display = 'none'; document.getElementById('2109.14524v1-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 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">6 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-21-3505 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Lett. B 831 (2022) 137165 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2109.09509">arXiv:2109.09509</a> <span> [<a href="https://arxiv.org/pdf/2109.09509">pdf</a>, <a href="https://arxiv.org/format/2109.09509">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="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.105.034001">10.1103/PhysRevC.105.034001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measuring Recoiling Nucleons from the Nucleus with the Electron Ion Collider </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Hauenstein%2C+F">F. Hauenstein</a>, <a href="/search/nucl-ex?searchtype=author&query=Jentsch%2C+A">A. Jentsch</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=Kiral%2C+A">A. Kiral</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=Furletova%2C+Y">Y. Furletova</a>, <a href="/search/nucl-ex?searchtype=author&query=Hen%2C+O">O. Hen</a>, <a href="/search/nucl-ex?searchtype=author&query=Higinbotham%2C+D+W">D. W. Higinbotham</a>, <a href="/search/nucl-ex?searchtype=author&query=Hyde%2C+C">C. Hyde</a>, <a href="/search/nucl-ex?searchtype=author&query=Morozov%2C+V">V. Morozov</a>, <a href="/search/nucl-ex?searchtype=author&query=Romanov%2C+D">D. Romanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Weinstein%2C+L+B">L. B. Weinstein</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="2109.09509v1-abstract-short" style="display: inline;"> Short range correlated nucleon-nucleon ($NN$) pairs are an important part of the nuclear ground state. They are typically studied by scattering an electron from one nucleon in the pair and detecting its spectator correlated partner ("spectator-nucleon tagging"). The Electron Ion Collider (EIC) should be able to detect these nucleons, since they are boosted to high momentum in the lab frame by the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.09509v1-abstract-full').style.display = 'inline'; document.getElementById('2109.09509v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2109.09509v1-abstract-full" style="display: none;"> Short range correlated nucleon-nucleon ($NN$) pairs are an important part of the nuclear ground state. They are typically studied by scattering an electron from one nucleon in the pair and detecting its spectator correlated partner ("spectator-nucleon tagging"). The Electron Ion Collider (EIC) should be able to detect these nucleons, since they are boosted to high momentum in the lab frame by the momentum of the ion beam. To determine the feasibility of these studies with the planned EIC detector configuration, we have simulated quasi-elastic scattering for two electron and ion beam energy configurations: 5 GeV $e^{-}$ and 41 GeV/A ions, and 10 GeV $e^{-}$ and 110 GeV/A ions. We show that the knocked-out and recoiling nucleons can be detected over a wide range of initial nucleon momenta. We also show that these measurements can achieve much larger momentum transfers than current fixed target experiments. By detecting both low and high initial-momentum nucleons, the EIC will provide the data that should allow scientists to definitively show if the EMC effect and short-range correlation are connected, and to improve our understanding of color transparency. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.09509v1-abstract-full').style.display = 'none'; document.getElementById('2109.09509v1-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 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">7 pages, 7 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-21-3496 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 105 (2022) 034001 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2107.06748">arXiv:2107.06748</a> <span> [<a href="https://arxiv.org/pdf/2107.06748">pdf</a>, <a href="https://arxiv.org/ps/2107.06748">ps</a>, <a href="https://arxiv.org/format/2107.06748">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="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/10.1140/epja/s10050-021-00625-2">10.1140/epja/s10050-021-00625-2 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Progress and Opportunities in Backward angle (u-channel) Physics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Bibrzycki%2C+%C5%81">艁. Bibrzycki</a>, <a href="/search/nucl-ex?searchtype=author&query=Diehl%2C+S">S. Diehl</a>, <a href="/search/nucl-ex?searchtype=author&query=Heppelmann%2C+S">S. Heppelmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Higinbotham%2C+D+W">D. W. Higinbotham</a>, <a href="/search/nucl-ex?searchtype=author&query=Huber%2C+G+M">G. M. Huber</a>, <a href="/search/nucl-ex?searchtype=author&query=Kay%2C+S+J+D">S. J. D. Kay</a>, <a href="/search/nucl-ex?searchtype=author&query=Klein%2C+S+R">S. R. Klein</a>, <a href="/search/nucl-ex?searchtype=author&query=Laget%2C+J+M">J. M. Laget</a>, <a href="/search/nucl-ex?searchtype=author&query=Li%2C+W+B">W. B. Li</a>, <a href="/search/nucl-ex?searchtype=author&query=Mathieu%2C+V">V. Mathieu</a>, <a href="/search/nucl-ex?searchtype=author&query=Park%2C+K">K. Park</a>, <a href="/search/nucl-ex?searchtype=author&query=Perry%2C+R+J">R. J. Perry</a>, <a href="/search/nucl-ex?searchtype=author&query=Pire%2C+B">B. Pire</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=Stanek%2C+A">A. Stanek</a>, <a href="/search/nucl-ex?searchtype=author&query=Stevens%2C+J+R">J. R. Stevens</a>, <a href="/search/nucl-ex?searchtype=author&query=Szymanowski%2C+L">L. Szymanowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Weiss%2C+C">C. Weiss</a>, <a href="/search/nucl-ex?searchtype=author&query=Yu%2C+B+-">B. -G. Yu</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="2107.06748v5-abstract-short" style="display: inline;"> Backward angle (u-channel) scattering provides complementary information for studies of hadron spectroscopy and structure, but has been less comprehensively studied than the corresponding forward angle case. As a result, the physics of u-channel scattering poses a range of new experimental and theoretical opportunities and questions. We summarize recent progress in measuring and understanding high… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.06748v5-abstract-full').style.display = 'inline'; document.getElementById('2107.06748v5-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2107.06748v5-abstract-full" style="display: none;"> Backward angle (u-channel) scattering provides complementary information for studies of hadron spectroscopy and structure, but has been less comprehensively studied than the corresponding forward angle case. As a result, the physics of u-channel scattering poses a range of new experimental and theoretical opportunities and questions. We summarize recent progress in measuring and understanding high energy reactions with baryon charge exchange in the u-channel, as discussed in the first backward angle (u-channel) Physics Workshop. In particular, we discuss backward angle measurements and their theoretical description via both hadronic models and the collinear factorization approach, and discuss planned future measurements of u-channel physics. Finally, we propose outstanding questions and challenges for u-channel physics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.06748v5-abstract-full').style.display = 'none'; document.getElementById('2107.06748v5-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 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. A (2021) 57 :342 </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/2103.03333">arXiv:2103.03333</a> <span> [<a href="https://arxiv.org/pdf/2103.03333">pdf</a>, <a href="https://arxiv.org/format/2103.03333">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/10.1038/s41567-021-01245-9">10.1038/s41567-021-01245-9 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the generalized spin polarizabilities of the neutron in the low $Q^2$ region </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Sulkosky%2C+V">V. Sulkosky</a>, <a href="/search/nucl-ex?searchtype=author&query=Peng%2C+C">C. Peng</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+J+-">J. -P. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Deur%2C+A">A. Deur</a>, <a href="/search/nucl-ex?searchtype=author&query=Abrahamyan%2C+S">S. Abrahamyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Aniol%2C+K+A">K. A. Aniol</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=Averett%2C+T">T. Averett</a>, <a href="/search/nucl-ex?searchtype=author&query=Bailey%2C+S+L">S. L. Bailey</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+A">A. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertin%2C+P">P. Bertin</a>, <a href="/search/nucl-ex?searchtype=author&query=Butaru%2C+F">F. Butaru</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W">W. Boeglin</a>, <a href="/search/nucl-ex?searchtype=author&query=Camsonne%2C+A">A. Camsonne</a>, <a href="/search/nucl-ex?searchtype=author&query=Cates%2C+G+D">G. D. Cates</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+C+C">C. C. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+S">Seonho Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Chudakov%2C+E">E. Chudakov</a>, <a href="/search/nucl-ex?searchtype=author&query=Coman%2C+L">L. Coman</a>, <a href="/search/nucl-ex?searchtype=author&query=Cornejo%2C+J+C">J. C Cornejo</a>, <a href="/search/nucl-ex?searchtype=author&query=Craver%2C+B">B. Craver</a>, <a href="/search/nucl-ex?searchtype=author&query=Cusanno%2C+F">F. Cusanno</a>, <a href="/search/nucl-ex?searchtype=author&query=De+Leo%2C+R">R. De Leo</a>, <a href="/search/nucl-ex?searchtype=author&query=de+Jager%2C+C+W">C. W. de Jager</a>, <a href="/search/nucl-ex?searchtype=author&query=Denton%2C+J+D">J. D. Denton</a> , et al. (84 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="2103.03333v3-abstract-short" style="display: inline;"> Understanding the nucleon spin structure in the regime where the strong interaction becomes truly strong poses a challenge to both experiment and theory. At energy scales below the nucleon mass of about 1 GeV, the intense interaction among the quarks and gluons inside the nucleon makes them highly correlated. Their coherent behaviour causes the emergence of effective degrees of freedom, requiring… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.03333v3-abstract-full').style.display = 'inline'; document.getElementById('2103.03333v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2103.03333v3-abstract-full" style="display: none;"> Understanding the nucleon spin structure in the regime where the strong interaction becomes truly strong poses a challenge to both experiment and theory. At energy scales below the nucleon mass of about 1 GeV, the intense interaction among the quarks and gluons inside the nucleon makes them highly correlated. Their coherent behaviour causes the emergence of effective degrees of freedom, requiring the application of non-perturbative techniques, such as chiral effective field theory. Here, we present measurements of the neutron's generalized spin-polarizabilities that quantify the neutron's spin precession under electromagnetic fields at very low energy-momentum transfer squared down to 0.035 GeV$^2$. In this regime, chiral effective field theory calculations are expected to be applicable. Our data, however, show a strong discrepancy with these predictions, presenting a challenge to the current description of the neutron's spin properties. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.03333v3-abstract-full').style.display = 'none'; document.getElementById('2103.03333v3-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 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 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">V1: initial version submitted to Nature Physics. V2: Published version. 16 pages, 7 figures. Additional material: 4 data tables (18 pages) V3: Typo corrected in author list. Paper content unchanged</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-21-3312, DOE/OR/23177-5119 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Physics, Vol. 17 687-692 (2021) </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$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.01842v3-abstract-full').style.display = 'none'; document.getElementById('2103.01842v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 2 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 128, 102002 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2102.11449">arXiv:2102.11449</a> <span> [<a href="https://arxiv.org/pdf/2102.11449">pdf</a>, <a href="https://arxiv.org/format/2102.11449">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epja/s10050-021-00508-6">10.1140/epja/s10050-021-00508-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Elastic Positron-Proton Scattering at Low Q$^2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Hague%2C+T+J">Tyler J. Hague</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutta%2C+D">Dipangkar Dutta</a>, <a href="/search/nucl-ex?searchtype=author&query=Higinbotham%2C+D+W">Douglas W. Higinbotham</a>, <a href="/search/nucl-ex?searchtype=author&query=Bai%2C+X">Xinzhan Bai</a>, <a href="/search/nucl-ex?searchtype=author&query=Gao%2C+H">Haiyan Gao</a>, <a href="/search/nucl-ex?searchtype=author&query=Gasparian%2C+A">Ashot Gasparian</a>, <a href="/search/nucl-ex?searchtype=author&query=Gnanvo%2C+K">Kondo Gnanvo</a>, <a href="/search/nucl-ex?searchtype=author&query=Khachatryan%2C+V">Vladimir Khachatryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Khandaker%2C+M">Mahbub Khandaker</a>, <a href="/search/nucl-ex?searchtype=author&query=Liyanage%2C+N">Nilanga Liyanage</a>, <a href="/search/nucl-ex?searchtype=author&query=Pasyuk%2C+E">Eugene Pasyuk</a>, <a href="/search/nucl-ex?searchtype=author&query=Peng%2C+C">Chao Peng</a>, <a href="/search/nucl-ex?searchtype=author&query=Xiong%2C+W">Weizhi Xiong</a>, <a href="/search/nucl-ex?searchtype=author&query=Zhou%2C+J">Jingyi Zhou</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="2102.11449v2-abstract-short" style="display: inline;"> Systematic differences in the the proton's charge radius, as determined by ordinary atoms and muonic atoms, have caused a resurgence of interest in elastic lepton scattering measurements. The proton's charge radius, defined as the slope of the charge form factor at Q$^2$=0, does not depend on the probe. Any difference in the apparent size of the proton, when determined from ordinary versus muonic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.11449v2-abstract-full').style.display = 'inline'; document.getElementById('2102.11449v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2102.11449v2-abstract-full" style="display: none;"> Systematic differences in the the proton's charge radius, as determined by ordinary atoms and muonic atoms, have caused a resurgence of interest in elastic lepton scattering measurements. The proton's charge radius, defined as the slope of the charge form factor at Q$^2$=0, does not depend on the probe. Any difference in the apparent size of the proton, when determined from ordinary versus muonic hydrogen, could point to new physics or need for the higher order corrections. While recent measurements seem to now be in agreement, there is to date no high precision elastic scattering data with both electrons and positrons. A high precision proton radius measurement could be performed in Hall B at Jefferson Lab with a positron beam and the calorimeter based setup of the PRad experiment. This measurement could also be extended to deuterons where a similar discrepancy has been observed between the muonic and electronic determination of deuteron charge radius. A new, high precision measurement with positrons, when viewed alongside electron scattering measurements and the forthcoming MUSE muon scattering measurement, could help provide new insights into the origins of the proton radius puzzle, and also provide new experimental constraints on radiative correction calculations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.11449v2-abstract-full').style.display = 'none'; document.getElementById('2102.11449v2-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 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 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">9 pages, 8 figures. arXiv admin note: substantial text overlap with arXiv:2007.15081</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. A 57, 199 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2012.11466">arXiv:2012.11466</a> <span> [<a href="https://arxiv.org/pdf/2012.11466">pdf</a>, <a href="https://arxiv.org/format/2012.11466">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="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.103.034604">10.1103/PhysRevC.103.034604 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the Ar(e,e$^\prime$ p) and Ti(e,e$^\prime$ p) cross sections in Jefferson Lab Hall A </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Gu%2C+L">L. Gu</a>, <a href="/search/nucl-ex?searchtype=author&query=Abrams%2C+D">D. Abrams</a>, <a href="/search/nucl-ex?searchtype=author&query=Ankowski%2C+A+M">A. M. Ankowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Jiang%2C+L">L. Jiang</a>, <a href="/search/nucl-ex?searchtype=author&query=Aljawrneh%2C+B">B. Aljawrneh</a>, <a href="/search/nucl-ex?searchtype=author&query=Alsalmi%2C+S">S. Alsalmi</a>, <a href="/search/nucl-ex?searchtype=author&query=Bane%2C+J">J. Bane</a>, <a href="/search/nucl-ex?searchtype=author&query=Batz%2C+A">A. Batz</a>, <a href="/search/nucl-ex?searchtype=author&query=Barcus%2C+S">S. Barcus</a>, <a href="/search/nucl-ex?searchtype=author&query=Barroso%2C+M">M. Barroso</a>, <a href="/search/nucl-ex?searchtype=author&query=Benhar%2C+O">O. Benhar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellini%2C+V">V. Bellini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bericic%2C+J">J. Bericic</a>, <a href="/search/nucl-ex?searchtype=author&query=Biswas%2C+D">D. Biswas</a>, <a href="/search/nucl-ex?searchtype=author&query=Camsonne%2C+A">A. Camsonne</a>, <a href="/search/nucl-ex?searchtype=author&query=Castellanos%2C+J">J. Castellanos</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+J+-">J. -P. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Christy%2C+M+E">M. E. Christy</a>, <a href="/search/nucl-ex?searchtype=author&query=Craycraft%2C+K">K. Craycraft</a>, <a href="/search/nucl-ex?searchtype=author&query=Cruz-Torres%2C+R">R. Cruz-Torres</a>, <a href="/search/nucl-ex?searchtype=author&query=Dai%2C+H">H. Dai</a>, <a href="/search/nucl-ex?searchtype=author&query=Day%2C+D">D. Day</a>, <a href="/search/nucl-ex?searchtype=author&query=Dusa%2C+S+-">S. -C. Dusa</a>, <a href="/search/nucl-ex?searchtype=author&query=Fuchey%2C+E">E. Fuchey</a>, <a href="/search/nucl-ex?searchtype=author&query=Gautam%2C+T">T. Gautam</a> , et al. (36 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="2012.11466v2-abstract-short" style="display: inline;"> The E12-14-012 experiment, performed in Jefferson Lab Hall A, has collected exclusive electron-scattering data (e,e$^\prime$p) in parallel kinematics using natural argon and natural titanium targets. Here, we report the first results of the analysis of the data set corresponding to beam energy of 2,222 MeV, electron scattering angle 21.5 deg, and proton emission angle -50 deg. The differential cro… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.11466v2-abstract-full').style.display = 'inline'; document.getElementById('2012.11466v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2012.11466v2-abstract-full" style="display: none;"> The E12-14-012 experiment, performed in Jefferson Lab Hall A, has collected exclusive electron-scattering data (e,e$^\prime$p) in parallel kinematics using natural argon and natural titanium targets. Here, we report the first results of the analysis of the data set corresponding to beam energy of 2,222 MeV, electron scattering angle 21.5 deg, and proton emission angle -50 deg. The differential cross sections, measured with $\sim$4% uncertainty, have been studied as a function of missing energy and missing momentum, and compared to the results of Monte Carlo simulations, obtained from a model based on the Distorted Wave Impulse Approximation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.11466v2-abstract-full').style.display = 'none'; document.getElementById('2012.11466v2-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 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 December, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">14 pages, 8 figures (submitted to PRC)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 103, 034604 (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/2010.09003">arXiv:2010.09003</a> <span> [<a href="https://arxiv.org/pdf/2010.09003">pdf</a>, <a href="https://arxiv.org/format/2010.09003">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> <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.103.024002">10.1103/PhysRevC.103.024002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Advanced extraction of the deuteron charge radius from electron-deuteron scattering data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Zhou%2C+J">Jingyi Zhou</a>, <a href="/search/nucl-ex?searchtype=author&query=Khachatryan%2C+V">Vladimir Khachatryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Gao%2C+H">Haiyan Gao</a>, <a href="/search/nucl-ex?searchtype=author&query=Higinbotham%2C+D+W">Douglas W. Higinbotham</a>, <a href="/search/nucl-ex?searchtype=author&query=Parker%2C+A">Asia Parker</a>, <a href="/search/nucl-ex?searchtype=author&query=Bai%2C+X">Xinzhan Bai</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutta%2C+D">Dipangkar Dutta</a>, <a href="/search/nucl-ex?searchtype=author&query=Gasparian%2C+A">Ashot Gasparian</a>, <a href="/search/nucl-ex?searchtype=author&query=Gnanvo%2C+K">Kondo Gnanvo</a>, <a href="/search/nucl-ex?searchtype=author&query=Khandaker%2C+M">Mahbub Khandaker</a>, <a href="/search/nucl-ex?searchtype=author&query=Liyanage%2C+N">Nilanga Liyanage</a>, <a href="/search/nucl-ex?searchtype=author&query=Pasyuk%2C+E">Eugene Pasyuk</a>, <a href="/search/nucl-ex?searchtype=author&query=Peng%2C+C">Chao Peng</a>, <a href="/search/nucl-ex?searchtype=author&query=Xiong%2C+W">Weizhi Xiong</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="2010.09003v2-abstract-short" style="display: inline;"> To extract the charge radius of the proton, $r_{p}$, from the electron scattering data, the PRad collaboration at Jefferson Lab has developed a rigorous framework for finding the best functional forms - the fitters - for a robust extraction of $r_{p}$ from a wide variety of sample functions for the range and uncertainties of the PRad data. In this paper we utilize and further develop this framewor… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.09003v2-abstract-full').style.display = 'inline'; document.getElementById('2010.09003v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2010.09003v2-abstract-full" style="display: none;"> To extract the charge radius of the proton, $r_{p}$, from the electron scattering data, the PRad collaboration at Jefferson Lab has developed a rigorous framework for finding the best functional forms - the fitters - for a robust extraction of $r_{p}$ from a wide variety of sample functions for the range and uncertainties of the PRad data. In this paper we utilize and further develop this framework. Herein we discuss methods for searching for the best fitter candidates as well as a procedure for testing the robustness of extraction of the deuteron charge radius, $r_{d}$, from parametrizations based on elastic electron-deuteron scattering data. The ansatz proposed in this paper for the robust extraction of $r_{d}$, for the proposed low-$Q^{2}$ DRad experiment at Jefferson Lab, can be further improved once there are more data. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.09003v2-abstract-full').style.display = 'none'; document.getElementById('2010.09003v2-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> 8 February, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 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">Comments:</span> <span class="has-text-grey-dark mathjax">14 pages, 3 tables and 9 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 103, 024002 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.10510">arXiv:2009.10510</a> <span> [<a href="https://arxiv.org/pdf/2009.10510">pdf</a>, <a href="https://arxiv.org/format/2009.10510">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="Nuclear Theory">nucl-th</span> </div> </div> <p class="title is-5 mathjax"> PRad-II: A New Upgraded High Precision Measurement of the Proton Charge Radius </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Gasparian%2C+A">A. Gasparian</a>, <a href="/search/nucl-ex?searchtype=author&query=Gao%2C+H">H. Gao</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutta%2C+D">D. Dutta</a>, <a href="/search/nucl-ex?searchtype=author&query=Liyanage%2C+N">N. Liyanage</a>, <a href="/search/nucl-ex?searchtype=author&query=Pasyuk%2C+E">E. Pasyuk</a>, <a href="/search/nucl-ex?searchtype=author&query=Higinbotham%2C+D+W">D. W. Higinbotham</a>, <a href="/search/nucl-ex?searchtype=author&query=Peng%2C+C">C. Peng</a>, <a href="/search/nucl-ex?searchtype=author&query=Gnanvo%2C+K">K. Gnanvo</a>, <a href="/search/nucl-ex?searchtype=author&query=Xiong%2C+W">W. Xiong</a>, <a href="/search/nucl-ex?searchtype=author&query=Bai%2C+X">X. Bai</a>, <a href="/search/nucl-ex?searchtype=author&query=collaboration%2C+t+P">the PRad collaboration</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="2009.10510v2-abstract-short" style="display: inline;"> The PRad experiment has credibly demonstrated the advantages of the calorimetric method in e-p scattering experiments to measure the proton root-mean-square (RMS) charge radius with high accuracy. The PRad result, within its experimental uncertainties, is in agreement with the small radius measured in muonic hydrogen spectroscopy experiments and it was a critical input in the recent revision of th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.10510v2-abstract-full').style.display = 'inline'; document.getElementById('2009.10510v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.10510v2-abstract-full" style="display: none;"> The PRad experiment has credibly demonstrated the advantages of the calorimetric method in e-p scattering experiments to measure the proton root-mean-square (RMS) charge radius with high accuracy. The PRad result, within its experimental uncertainties, is in agreement with the small radius measured in muonic hydrogen spectroscopy experiments and it was a critical input in the recent revision of the CODATA recommendation for the proton charge radius. Consequently, the PRad result is in direct conflict with all modern electron scattering experiments. Most importantly, it is 5.8% smaller than the value from the most precise electron scattering experiment to date, and this difference is about three standard deviations given the precision of the PRad experiment. As the first experiment of its kind, PRad did not reach the highest precision allowed by the calorimetric technique. Here we propose a new (and) upgraded experiment -- PRad-II, which will reduce the overall experimental uncertainties by a factor of 3.8 compared to PRad and address this as yet unsettled controversy in subatomic physics. In addition, PRad-II will be the first lepton scattering experiment to reach the Q^2 range of 10^{-5} GeV^2 allowing a more accurate and robust extraction of the proton charge radius. The muonic hydrogen result with its unprecedented precision (~0.05%) determines the CODATA value of the proton charge radius, hence, it is critical to evaluate possible systematic uncertainties of those experiments, such as the laser frequency calibration that was raised in recent review articles. The PRad-II experiment with its projected total uncertainty of 0.43% could demonstrate whether there is any systematic difference between $e-p$ scattering and muonic hydrogen results. PRad-II will establish a new precision frontier in electron scattering and open doors for future physics opportunities. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.10510v2-abstract-full').style.display = 'none'; document.getElementById('2009.10510v2-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 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 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">Proposal approved by JLab PAC 48</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.09617">arXiv:2009.09617</a> <span> [<a href="https://arxiv.org/pdf/2009.09617">pdf</a>, <a href="https://arxiv.org/format/2009.09617">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"> Studying Short-Range Correlations with Real Photon Beams at GlueX </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Hen%2C+O">O. Hen</a>, <a href="/search/nucl-ex?searchtype=author&query=Patsyuk%2C+M">M. Patsyuk</a>, <a href="/search/nucl-ex?searchtype=author&query=Piasetzky%2C+E">E. Piasetzky</a>, <a href="/search/nucl-ex?searchtype=author&query=Schmidt%2C+A">A. Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Somov%2C+A">A. Somov</a>, <a href="/search/nucl-ex?searchtype=author&query=Szumila-Vance%2C+H">H. Szumila-Vance</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=Dutta%2C+D">D. Dutta</a>, <a href="/search/nucl-ex?searchtype=author&query=Gao%2C+H">H. Gao</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M">M. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Ashkenazi%2C+A">A. Ashkenazi</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+A">A. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Berdnikov%2C+V">V. Berdnikov</a>, <a href="/search/nucl-ex?searchtype=author&query=Black%2C+T">T. Black</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=Britton%2C+T">T. Britton</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W">W. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Cruz-Torres%2C+R">R. Cruz-Torres</a>, <a href="/search/nucl-ex?searchtype=author&query=Dalton%2C+M+M">M. M. Dalton</a>, <a href="/search/nucl-ex?searchtype=author&query=Denniston%2C+A">A. Denniston</a>, <a href="/search/nucl-ex?searchtype=author&query=Deur%2C+A">A. Deur</a>, <a href="/search/nucl-ex?searchtype=author&query=Egiyan%2C+H">H. Egiyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Fanelli%2C+C">C. Fanelli</a>, <a href="/search/nucl-ex?searchtype=author&query=Fegan%2C+S">S. Fegan</a>, <a href="/search/nucl-ex?searchtype=author&query=Furletov%2C+S">S. Furletov</a> , et al. (37 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="2009.09617v3-abstract-short" style="display: inline;"> The past few years has seen tremendous progress in our understanding of short-range correlated (SRC) pairing of nucleons within nuclei, much of it coming from electron scattering experiments leading to the break-up of an SRC pair. The interpretation of these experiments rests on assumptions about the mechanism of the reaction. These assumptions can be directly tested by studying SRC pairs using al… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.09617v3-abstract-full').style.display = 'inline'; document.getElementById('2009.09617v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.09617v3-abstract-full" style="display: none;"> The past few years has seen tremendous progress in our understanding of short-range correlated (SRC) pairing of nucleons within nuclei, much of it coming from electron scattering experiments leading to the break-up of an SRC pair. The interpretation of these experiments rests on assumptions about the mechanism of the reaction. These assumptions can be directly tested by studying SRC pairs using alternate probes, such as real photons. We propose a 30-day experiment using the Hall D photon beam, nuclear targets, and the GlueX detector in its standard configuration to study short-range correlations with photon-induced reactions. Several different reaction channels are possible, and we project sensitivity in most channels to equal or exceed the 6 GeV-era SRC experiments from Halls A and B. The proposed experiment will therefore decisively test the phenomena of np dominance, the short-distance NN interaction, and reaction theory, while also providing new insight into bound nucleon structure and the onset of color transparency. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.09617v3-abstract-full').style.display = 'none'; document.getElementById('2009.09617v3-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 October, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 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">38 pages, 26 figures, proposal for Jefferson Lab Experiment E12-19-003, submitted to Jefferson Lab PAC 47 (2019)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2007.15081">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/2006.10249">arXiv:2006.10249</a> <span> [<a href="https://arxiv.org/pdf/2006.10249">pdf</a>, <a href="https://arxiv.org/format/2006.10249">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> <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/PhysRevResearch.3.023240">10.1103/PhysRevResearch.3.023240 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Short-Range Correlations and the Nuclear EMC Effect in Deuterium and Helium-3 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Segarra%2C+E+P">E. P. Segarra</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=Hauenstein%2C+F">F. Hauenstein</a>, <a href="/search/nucl-ex?searchtype=author&query=Higinbotham%2C+D+W">D. W. Higinbotham</a>, <a href="/search/nucl-ex?searchtype=author&query=Miller%2C+G+A">G. A. Miller</a>, <a href="/search/nucl-ex?searchtype=author&query=Piasetzky%2C+E">E. Piasetzky</a>, <a href="/search/nucl-ex?searchtype=author&query=Schmidt%2C+A">A. Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Strikman%2C+M">M. Strikman</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=Hen%2C+O">O. Hen</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="2006.10249v2-abstract-short" style="display: inline;"> The EMC effect in deuterium and helium-3 is studied using a convolution formalism that allows isolating the impact of high-momentum nucleons in short-ranged correlated (SRC) pairs. We assume that the modification of the structure function of bound nucleons is given by a universal (i.e. nucleus independent) function of their virtuality, and find that the effect of such modifications is dominated by… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.10249v2-abstract-full').style.display = 'inline'; document.getElementById('2006.10249v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.10249v2-abstract-full" style="display: none;"> The EMC effect in deuterium and helium-3 is studied using a convolution formalism that allows isolating the impact of high-momentum nucleons in short-ranged correlated (SRC) pairs. We assume that the modification of the structure function of bound nucleons is given by a universal (i.e. nucleus independent) function of their virtuality, and find that the effect of such modifications is dominated by nucleons in SRC pairs. This SRC-dominance of nucleon modifications is observed despite the fact that the bulk of the nuclear inelastic scattering cross-section comes from interacting with low-momentum nucleons. These findings are found to be robust to model details including nucleon modification function parametrization, free nucleon structure function and treatment of nucleon motion effects. While existing data cannot discriminate between such model details, we present predictions for measured, but not yet published, tritium EMC effect and tagged nucleon structure functions in deuterium that are sensitive to the neutron structure functions and bound nucleon modification functions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.10249v2-abstract-full').style.display = 'none'; document.getElementById('2006.10249v2-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 July, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 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">9 pages, 9 figures, 1 table, and online supplementary materials</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Research 3, 023240 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2004.11448">arXiv:2004.11448</a> <span> [<a href="https://arxiv.org/pdf/2004.11448">pdf</a>, <a href="https://arxiv.org/format/2004.11448">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.102.064004">10.1103/PhysRevC.102.064004 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Novel observation of isospin structure of short-range correlations in calcium isotopes </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Nguyen%2C+D">D. Nguyen</a>, <a href="/search/nucl-ex?searchtype=author&query=Ye%2C+Z">Z. Ye</a>, <a href="/search/nucl-ex?searchtype=author&query=Aguilera%2C+P">P. Aguilera</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=Allada%2C+K">K. Allada</a>, <a href="/search/nucl-ex?searchtype=author&query=Anderson%2C+B">B. Anderson</a>, <a href="/search/nucl-ex?searchtype=author&query=Anez%2C+D">D. Anez</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=Averett%2C+T">T. Averett</a>, <a href="/search/nucl-ex?searchtype=author&query=Baghdasaryan%2C+H">H. Baghdasaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Bai%2C+X">X. Bai</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+A">A. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+S">S. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellini%2C+V">V. Bellini</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=Camsonne%2C+A">A. Camsonne</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+C">C. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+J+-">J. -P. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chirapatpimol%2C+K">K. Chirapatpimol</a>, <a href="/search/nucl-ex?searchtype=author&query=Cisbani%2C+E">E. Cisbani</a>, <a href="/search/nucl-ex?searchtype=author&query=Dalton%2C+M+M">M. M. Dalton</a>, <a href="/search/nucl-ex?searchtype=author&query=Daniel%2C+A">A. Daniel</a> , et al. (79 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="2004.11448v2-abstract-short" style="display: inline;"> Short Range Correlations (SRCs) have been identified as being responsible for the high momentum tail of the nucleon momentum distribution, n(k). Hard, short-range interactions of nucleon pairs generate the high momentum tail and imprint a universal character on n(k) for all nuclei at large momentum. Triple coincidence experiments have shown a strong dominance of np pairs, but these measurements in… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2004.11448v2-abstract-full').style.display = 'inline'; document.getElementById('2004.11448v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2004.11448v2-abstract-full" style="display: none;"> Short Range Correlations (SRCs) have been identified as being responsible for the high momentum tail of the nucleon momentum distribution, n(k). Hard, short-range interactions of nucleon pairs generate the high momentum tail and imprint a universal character on n(k) for all nuclei at large momentum. Triple coincidence experiments have shown a strong dominance of np pairs, but these measurements involve large final state interactions. This paper presents the results from Jefferson Lab experiment E08014 which measured inclusive electron scattering cross-section from Ca isotopes. By comparing the inclusive cross section from 48Ca to 40Ca in a kinematic region dominated by SRCs we provide a new way to study the isospin structure of SRCs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2004.11448v2-abstract-full').style.display = 'none'; document.getElementById('2004.11448v2-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> 17 December, 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">7 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-20-3177, DOE/OR/23177-4956 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 102, 064004 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2004.07304">arXiv:2004.07304</a> <span> [<a href="https://arxiv.org/pdf/2004.07304">pdf</a>, <a href="https://arxiv.org/format/2004.07304">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> <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.physletb.2021.136523">10.1016/j.physletb.2021.136523 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> $^{12}$C(e,e'pN) Measurements of Short Range Correlations in the Tensor-to-Scalar Interaction Transition Region </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Korover%2C+I">I. Korover</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=Schmidt%2C+A">A. Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Hauenstein%2C+F">F. Hauenstein</a>, <a href="/search/nucl-ex?searchtype=author&query=Duer%2C+M">M. Duer</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=Higinbotham%2C+D+W">D. W. Higinbotham</a>, <a href="/search/nucl-ex?searchtype=author&query=Collaboration%2C+t+C">the CLAS Collaboration</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="2004.07304v2-abstract-short" style="display: inline;"> High-momentum configurations of nucleon pairs at short-distance are probed using measurements of the $^{12}$C$(e,e'p)$ and $^{12}$C$(e,e'pN)$ reactions (where $N$ is either $n$ or $p$), at high-$Q^2$ and $x_B>1.1$. The data span a missing-momentum range of 300--1000 MeV/c and are predominantly sensitive to the transition region of the strong nuclear interaction from a Tensor to Scalar interaction.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2004.07304v2-abstract-full').style.display = 'inline'; document.getElementById('2004.07304v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2004.07304v2-abstract-full" style="display: none;"> High-momentum configurations of nucleon pairs at short-distance are probed using measurements of the $^{12}$C$(e,e'p)$ and $^{12}$C$(e,e'pN)$ reactions (where $N$ is either $n$ or $p$), at high-$Q^2$ and $x_B>1.1$. The data span a missing-momentum range of 300--1000 MeV/c and are predominantly sensitive to the transition region of the strong nuclear interaction from a Tensor to Scalar interaction. The data are well reproduced by theoretical calculations using the Generalized Contact Formalism with both chiral and phenomenological nucleon-nucleon ($NN$) interaction models. This agreement suggests that the measured high missing-momentum protons up to $1000$ MeV/c predominantly belong to short-ranged correlated (SRC) pairs. The measured $^{12}$C$(e,e'pN)$ / $^{12}$C$(e,e'p)$ and $^{12}$C$(e,e'pp)$ / $^{12}$C$(e,e'pn)$ cross-section ratios are consistent with a decrease in the fraction of proton-neutron SRC pairs and increase in the fraction of proton-proton SRC pairs with increasing missing momentum. This confirms the transition from an isospin-dependent tensor $NN$ interaction at $\sim 400$ MeV/c to an isospin-independent scalar interaction at high-momentum around $\sim 800$ MeV/c as predicted by theoretical calculation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2004.07304v2-abstract-full').style.display = 'none'; document.getElementById('2004.07304v2-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 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 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">Accepted for publication in Physics Letters B. 7 pages, 3 figures, and online supplementary materials</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Lett. B 820, 136523 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2003.03816">arXiv:2003.03816</a> <span> [<a href="https://arxiv.org/pdf/2003.03816">pdf</a>, <a href="https://arxiv.org/ps/2003.03816">ps</a>, <a href="https://arxiv.org/format/2003.03816">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="Data Analysis, Statistics and Probability">physics.data-an</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/10.3389/fphy.2020.00036">10.3389/fphy.2020.00036 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Reinterpretation of classic proton charge form factor measurements </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Mihovilovic%2C+M">Miha Mihovilovic</a>, <a href="/search/nucl-ex?searchtype=author&query=Higinbotham%2C+D+W">Douglas W. Higinbotham</a>, <a href="/search/nucl-ex?searchtype=author&query=Bevc%2C+M">Melisa Bevc</a>, <a href="/search/nucl-ex?searchtype=author&query=Sirca%2C+S">Simon Sirca</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="2003.03816v1-abstract-short" style="display: inline;"> In 1963, a proton radius of $0.805(11)~\mathrm{fm}$ was extracted from electron scattering data and this classic value has been used in the standard dipole parameterization of the form factor. In trying to reproduce this classic result, we discovered that there was a sign error in the original analysis and that the authors should have found a value of $0.851(19)~\mathrm{fm}$. We additionally made… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2003.03816v1-abstract-full').style.display = 'inline'; document.getElementById('2003.03816v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2003.03816v1-abstract-full" style="display: none;"> In 1963, a proton radius of $0.805(11)~\mathrm{fm}$ was extracted from electron scattering data and this classic value has been used in the standard dipole parameterization of the form factor. In trying to reproduce this classic result, we discovered that there was a sign error in the original analysis and that the authors should have found a value of $0.851(19)~\mathrm{fm}$. We additionally made use of modern computing power to find a robust function for extracting the radius using this 1963 data's spacing and uncertainty. This optimal function, the Pad茅 $(0,1)$ approximant, also gives a result which is consistent with the modern high precision proton radius extractions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2003.03816v1-abstract-full').style.display = 'none'; document.getElementById('2003.03816v1-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> 8 March, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">10 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Front. in Phys. 8 (2020) 36 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2003.02318">arXiv:2003.02318</a> <span> [<a href="https://arxiv.org/pdf/2003.02318">pdf</a>, <a href="https://arxiv.org/format/2003.02318">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</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.physletb.2020.135429">10.1016/j.physletb.2020.135429 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Generalized Contact Formalism Analysis of the $^4$He$(e,e'pN)$ Reaction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Pybus%2C+J+R">J. R. Pybus</a>, <a href="/search/nucl-ex?searchtype=author&query=Korover%2C+I">I. Korover</a>, <a href="/search/nucl-ex?searchtype=author&query=Weiss%2C+R">R. Weiss</a>, <a href="/search/nucl-ex?searchtype=author&query=Schmidt%2C+A">A. Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Barnea%2C+N">N. Barnea</a>, <a href="/search/nucl-ex?searchtype=author&query=Higinbotham%2C+D+W">D. W. Higinbotham</a>, <a href="/search/nucl-ex?searchtype=author&query=Piasetzky%2C+E">E. Piasetzky</a>, <a href="/search/nucl-ex?searchtype=author&query=Strikman%2C+M">M. Strikman</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=Hen%2C+O">O. Hen</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="2003.02318v2-abstract-short" style="display: inline;"> Measurements of short-range correlations in exclusive $^4$He$(e,e'pN)$ reactions are analyzed using the Generalized Contact Formalism (GCF). We consider both instant-form and light-cone formulations with both the AV18 and local N2LO(1.0) nucleon-nucleon ($NN$) potentials. We find that kinematic distributions, such as the reconstructed pair opening angle, recoil neutron momentum distribution, and p… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2003.02318v2-abstract-full').style.display = 'inline'; document.getElementById('2003.02318v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2003.02318v2-abstract-full" style="display: none;"> Measurements of short-range correlations in exclusive $^4$He$(e,e'pN)$ reactions are analyzed using the Generalized Contact Formalism (GCF). We consider both instant-form and light-cone formulations with both the AV18 and local N2LO(1.0) nucleon-nucleon ($NN$) potentials. We find that kinematic distributions, such as the reconstructed pair opening angle, recoil neutron momentum distribution, and pair center of mass motion, as well as the measured missing energy, missing mass distributions, are all well reproduced by GCF calculations. The missing momentum dependence of the measured $^4$He$(e,e'pN)$ / $^4$He$(e,e'p)$ cross-section ratios, sensitive to nature of the $NN$ interaction at short-distacnes, are also well reproduced by GCF calculations using either interaction and formulation. This gives credence to the GCF scale-separated factorized description of the short-distance many-body nuclear wave-function. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2003.02318v2-abstract-full').style.display = 'none'; document.getElementById('2003.02318v2-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 April, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 March, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">Accepted for publication in Physics Letters B. 8 pages, 4 figures and online supplementary materials</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2002.05167">arXiv:2002.05167</a> <span> [<a href="https://arxiv.org/pdf/2002.05167">pdf</a>, <a href="https://arxiv.org/format/2002.05167">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 - Lattice">hep-lat</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> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-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/PhysRevC.102.035203">10.1103/PhysRevC.102.035203 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Precise determination of proton magnetic radius from electron scattering data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Alarc%C3%B3n%2C+J+M">J. M. Alarc贸n</a>, <a href="/search/nucl-ex?searchtype=author&query=Higinbotham%2C+D+W">D. W. Higinbotham</a>, <a href="/search/nucl-ex?searchtype=author&query=Weiss%2C+C">C. Weiss</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="2002.05167v1-abstract-short" style="display: inline;"> We extract the proton magnetic radius from the high-precision electron-proton elastic scattering cross section data. Our theoretical framework combines dispersion analysis and chiral effective field theory and implements the dynamics governing the shape of the low-$Q^2$ form factors. It allows us to use data up to $Q^2\sim$ 0.5 GeV$^2$ for constraining the radii and overcomes the difficulties of e… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.05167v1-abstract-full').style.display = 'inline'; document.getElementById('2002.05167v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2002.05167v1-abstract-full" style="display: none;"> We extract the proton magnetic radius from the high-precision electron-proton elastic scattering cross section data. Our theoretical framework combines dispersion analysis and chiral effective field theory and implements the dynamics governing the shape of the low-$Q^2$ form factors. It allows us to use data up to $Q^2\sim$ 0.5 GeV$^2$ for constraining the radii and overcomes the difficulties of empirical fits and $Q^2 \rightarrow 0$ extrapolation. We obtain a magnetic radius $r_M^p$ = 0.850 $\pm$0.001 (fit 68%) $\pm$0.010 (theory full range) fm, significantly different from earlier results obtained from the same data, and close to the extracted electric radius $r_E^p$ = 0.842 $\pm$0.002 (fit) $\pm$0.010 (theory) fm. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.05167v1-abstract-full').style.display = 'none'; document.getElementById('2002.05167v1-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 February, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">5 pages, 2 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-THY-20-3149 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 102, 035203 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2001.07230">arXiv:2001.07230</a> <span> [<a href="https://arxiv.org/pdf/2001.07230">pdf</a>, <a href="https://arxiv.org/format/2001.07230">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="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/PhysRevLett.124.212501">10.1103/PhysRevLett.124.212501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Probing few-body nuclear dynamics via 3H and 3He (e,e'p)pn cross-section measurements </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Cruz-Torres%2C+R">R. Cruz-Torres</a>, <a href="/search/nucl-ex?searchtype=author&query=Nguyen%2C+D">D. Nguyen</a>, <a href="/search/nucl-ex?searchtype=author&query=Hauenstein%2C+F">F. Hauenstein</a>, <a href="/search/nucl-ex?searchtype=author&query=Schmidt%2C+A">A. Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Li%2C+S">S. Li</a>, <a href="/search/nucl-ex?searchtype=author&query=Abrams%2C+D">D. Abrams</a>, <a href="/search/nucl-ex?searchtype=author&query=Albataineh%2C+H">H. Albataineh</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=Armstrong%2C+W">W. Armstrong</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=Beck%2C+A">A. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellini%2C+V">V. Bellini</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhatt%2C+H">H. Bhatt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhetuwal%2C+D">D. Bhetuwal</a>, <a href="/search/nucl-ex?searchtype=author&query=Biswas%2C+D">D. Biswas</a>, <a href="/search/nucl-ex?searchtype=author&query=Blyth%2C+D">D. Blyth</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="2001.07230v3-abstract-short" style="display: inline;"> We report the first measurement of the \eep three-body breakup reaction cross sections in helium-3 ($^3$He) and tritium ($^3$H) at large momentum transfer ($\langle Q^2 \rangle \approx 1.9$ (GeV/c)$^2$) and $x_B>1$ kinematics, where the cross section should be sensitive to quasielastic (QE) scattering from single nucleons. The data cover missing momenta $40 \le p_{miss} \le 500$ MeV/c that, in the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2001.07230v3-abstract-full').style.display = 'inline'; document.getElementById('2001.07230v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2001.07230v3-abstract-full" style="display: none;"> We report the first measurement of the \eep three-body breakup reaction cross sections in helium-3 ($^3$He) and tritium ($^3$H) at large momentum transfer ($\langle Q^2 \rangle \approx 1.9$ (GeV/c)$^2$) and $x_B>1$ kinematics, where the cross section should be sensitive to quasielastic (QE) scattering from single nucleons. The data cover missing momenta $40 \le p_{miss} \le 500$ MeV/c that, in the QE limit with no rescattering, equals the initial momentum of the probed nucleon. The measured cross sections are compared with state-of-the-art ab-initio calculations. Overall good agreement, within $\pm20\%$, is observed between data and calculations for the full $p_{miss}$ range for $^3$H and for $100 \le p_{miss} \le 350$ MeV/c for $^3$He. Including the effects of rescattering of the outgoing nucleon improves agreement with the data at $p_{miss} > 250$ MeV/c and suggests contributions from charge-exchange (SCX) rescattering. The isoscalar sum of $^3$He plus $^3$H, which is largely insensitive to SCX, is described by calculations to within the accuracy of the data over the entire $p_{miss}$ range. This validates current models of the ground state of the three-nucleon system up to very high initial nucleon momenta of $500$ MeV/c. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2001.07230v3-abstract-full').style.display = 'none'; document.getElementById('2001.07230v3-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> 17 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 January, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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">Accepted for publication in PRL. 8 pages, 3 figures, and online supplementary materials</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 124, 212501 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1908.05709">arXiv:1908.05709</a> <span> [<a href="https://arxiv.org/pdf/1908.05709">pdf</a>, <a href="https://arxiv.org/format/1908.05709">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.2020.135428">10.1016/j.physletb.2020.135428 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the 3He Spin-Structure Functions and of Neutron (3He) Spin-Dependent Sum Rules at 0.035<Q^2<0.24 GeV^2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Sulkosky%2C+V">V. Sulkosky</a>, <a href="/search/nucl-ex?searchtype=author&query=Singh%2C+J+T">J. T. Singh</a>, <a href="/search/nucl-ex?searchtype=author&query=Peng%2C+C">C. Peng</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+J+-">J. -P. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Deur%2C+A">A. Deur</a>, <a href="/search/nucl-ex?searchtype=author&query=Abrahamyan%2C+S">S. Abrahamyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Aniol%2C+K+A">K. A. Aniol</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=Averett%2C+T">T. Averett</a>, <a href="/search/nucl-ex?searchtype=author&query=Bailey%2C+S+L">S. L. Bailey</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+A">A. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertin%2C+P">P. Bertin</a>, <a href="/search/nucl-ex?searchtype=author&query=Butaru%2C+F">F. Butaru</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W">W. Boeglin</a>, <a href="/search/nucl-ex?searchtype=author&query=Camsonne%2C+A">A. Camsonne</a>, <a href="/search/nucl-ex?searchtype=author&query=Cates%2C+G+D">G. D. Cates</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+C+C">C. C. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+S">Seonho Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Chudakov%2C+E">E. Chudakov</a>, <a href="/search/nucl-ex?searchtype=author&query=Coman%2C+L">L. Coman</a>, <a href="/search/nucl-ex?searchtype=author&query=Cornejo%2C+J+C">J. C Cornejo</a>, <a href="/search/nucl-ex?searchtype=author&query=Craver%2C+B">B. Craver</a>, <a href="/search/nucl-ex?searchtype=author&query=Cusanno%2C+F">F. Cusanno</a>, <a href="/search/nucl-ex?searchtype=author&query=De+Leo%2C+R">R. De Leo</a>, <a href="/search/nucl-ex?searchtype=author&query=de+Jager%2C+C+W">C. W. de Jager</a> , et al. (84 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="1908.05709v2-abstract-short" style="display: inline;"> The spin-structure functions $g_1$ and $g_2$, and the spin-dependent partial cross-section $蟽_\mathrm{TT}$ have been extracted from the polarized cross-sections differences, $螖蟽_{\parallel}\hspace{-0.06cm}\left(谓,Q^{2}\right)$ and $螖蟽_{\perp}\hspace{-0.06cm}\left(谓,Q^{2}\right)$ measured for the $\vec{^\textrm{3}\textrm{He}}(\vec{\textrm{e}},\textrm{e}')\textrm{X}$ reaction, in the E97-110 experim… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1908.05709v2-abstract-full').style.display = 'inline'; document.getElementById('1908.05709v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1908.05709v2-abstract-full" style="display: none;"> The spin-structure functions $g_1$ and $g_2$, and the spin-dependent partial cross-section $蟽_\mathrm{TT}$ have been extracted from the polarized cross-sections differences, $螖蟽_{\parallel}\hspace{-0.06cm}\left(谓,Q^{2}\right)$ and $螖蟽_{\perp}\hspace{-0.06cm}\left(谓,Q^{2}\right)$ measured for the $\vec{^\textrm{3}\textrm{He}}(\vec{\textrm{e}},\textrm{e}')\textrm{X}$ reaction, in the E97-110 experiment at Jefferson Lab. Polarized electrons with energies from 1.147 to 4.404 GeV were scattered at angles of 6$^{\circ}$ and 9$^{\circ}$ from a longitudinally or transversely polarized $^{3}$He target. The data cover the kinematic regions of the quasi-elastic, resonance production and beyond. From the extracted spin-structure functions, the first moments $\overline{螕_1}\hspace{-0.06cm}\left(Q^{2}\right)$, $螕_2\hspace{-0.06cm}\left(Q^{2}\right)$ and $I_{\mathrm{TT}}\hspace{-0.06cm}\left(Q^{2}\right)$ are evaluated with high precision for the neutron in the $Q^2$ range from 0.035 to 0.24~GeV$^{2}$. The comparison of the data and the chiral effective field theory predictions reveals the importance of proper treatment of the $螖$ degree of freedom for spin observables. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1908.05709v2-abstract-full').style.display = 'none'; document.getElementById('1908.05709v2-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 April, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 August, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 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">7 pages, 5 figures, 3 tables. Version published in Phys. Lett. B</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-19-3015 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Lett.B 805 135428 (2020) </p> </li> </ol> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Higinbotham%2C+D+W&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Higinbotham%2C+D+W&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Higinbotham%2C+D+W&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> <li> <a href="/search/?searchtype=author&query=Higinbotham%2C+D+W&start=100" 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