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<button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <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=Holt%2C+R+J&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Holt%2C+R+J&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Holt%2C+R+J&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> </ul> </nav> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/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/2406.11459">arXiv:2406.11459</a> <span> [<a href="https://arxiv.org/pdf/2406.11459">pdf</a>, <a href="https://arxiv.org/format/2406.11459">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/10.1016/j.physletb.2024.139032">10.1016/j.physletb.2024.139032 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of $J/蠄$ and $蠄\left(2S\right)$ production in $p+p$ and $p+d$ interactions at 120 GeV </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Leung%2C+C+H">C. H. Leung</a>, <a href="/search/nucl-ex?searchtype=author&query=Nagai%2C+K">K. Nagai</a>, <a href="/search/nucl-ex?searchtype=author&query=Nakano%2C+K">K. Nakano</a>, <a href="/search/nucl-ex?searchtype=author&query=Nawarathne%2C+D">D. Nawarathne</a>, <a href="/search/nucl-ex?searchtype=author&query=Dove%2C+J">J. Dove</a>, <a href="/search/nucl-ex?searchtype=author&query=Prasad%2C+S">S. Prasad</a>, <a href="/search/nucl-ex?searchtype=author&query=Wuerfel%2C+N">N. Wuerfel</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=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Ayuso%2C+C">C. Ayuso</a>, <a href="/search/nucl-ex?searchtype=author&query=Barker%2C+C+L">C. L. Barker</a>, <a href="/search/nucl-ex?searchtype=author&query=Brown%2C+C+N">C. N. Brown</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+W+C">W. C. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+A">A. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Christian%2C+D+C">D. C. Christian</a>, <a href="/search/nucl-ex?searchtype=author&query=Dannowitz%2C+B+P">B. P. Dannowitz</a>, <a href="/search/nucl-ex?searchtype=author&query=Daugherity%2C+M">M. Daugherity</a>, <a href="/search/nucl-ex?searchtype=author&query=Fassi%2C+L+E">L. El Fassi</a>, <a href="/search/nucl-ex?searchtype=author&query=Geesaman%2C+D+F">D. F. Geesaman</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilman%2C+R">R. Gilman</a>, <a href="/search/nucl-ex?searchtype=author&query=Goto%2C+Y">Y. Goto</a>, <a href="/search/nucl-ex?searchtype=author&query=Guo%2C+R">R. 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=Holt%2C+R+J">R. J. Holt</a>, <a href="/search/nucl-ex?searchtype=author&query=Hossain%2C+M+F">M. F. Hossain</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="2406.11459v3-abstract-short" style="display: inline;"> We report the $p+p$ and $p+d$ differential cross sections measured in the SeaQuest experiment for $J/蠄$ and $蠄\left(2S\right)$ production at 120 GeV beam energy covering the forward $x$-Feynman ($x_F$) range of $0.5 < x_F <0.9$. The measured cross sections are in good agreement with theoretical calculations based on the nonrelativistic QCD (NRQCD) using the long-distance matrix elements deduced fr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.11459v3-abstract-full').style.display = 'inline'; document.getElementById('2406.11459v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.11459v3-abstract-full" style="display: none;"> We report the $p+p$ and $p+d$ differential cross sections measured in the SeaQuest experiment for $J/蠄$ and $蠄\left(2S\right)$ production at 120 GeV beam energy covering the forward $x$-Feynman ($x_F$) range of $0.5 < x_F <0.9$. The measured cross sections are in good agreement with theoretical calculations based on the nonrelativistic QCD (NRQCD) using the long-distance matrix elements deduced from a recent global analysis of proton- and pion-induced charmonium production data. The $蟽_{蠄\left(2S\right)} / 蟽_{J/蠄}$ cross section ratios are found to increase as $x_F$ increases, indicating that the $q \bar{q}$ annihilation process has larger contributions in the $蠄\left(2S\right)$ production than the $J/蠄$ production. The $蟽_{pd}/2蟽_{pp}$ cross section ratios are observed to be significantly different for the Drell-Yan process and $J/蠄$ production, reflecting their different production mechanisms. We find that the $蟽_{pd}/2蟽_{pp}$ ratios for $J/蠄$ production at the forward $x_F$ region are sensitive to the $\bar{d}/ \bar{u}$ flavor asymmetry of the proton sea, analogous to the Drell-Yan process. The transverse momentum ($p_T$) distributions for $J/蠄$ and $蠄\left(2S\right)$ production are also presented and compared with data collected at higher center-of-mass energies. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.11459v3-abstract-full').style.display = 'none'; document.getElementById('2406.11459v3-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> 22 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">8 pages, 7 figures, with 1 page of supplementary material which has 2 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Lett. B 858, 139032 (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/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/2302.12760">arXiv:2302.12760</a> <span> [<a href="https://arxiv.org/pdf/2302.12760">pdf</a>, <a href="https://arxiv.org/format/2302.12760">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.107.035801">10.1103/PhysRevC.107.035801 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measuring the cross section of the $^{15}$N($伪$,$纬$)$^{19}$F reaction using a single-fluid bubble chamber </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Neto%2C+D">D. Neto</a>, <a href="/search/nucl-ex?searchtype=author&query=Bailey%2C+K">K. Bailey</a>, <a href="/search/nucl-ex?searchtype=author&query=Benesch%2C+J+F">J. F. Benesch</a>, <a href="/search/nucl-ex?searchtype=author&query=Cade%2C+B">B. Cade</a>, <a href="/search/nucl-ex?searchtype=author&query=DiGiovine%2C+B">B. DiGiovine</a>, <a href="/search/nucl-ex?searchtype=author&query=Freyberger%2C+A">A. Freyberger</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=Hofler%2C+A">A. Hofler</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=Kazimi%2C+R">R. Kazimi</a>, <a href="/search/nucl-ex?searchtype=author&query=Meekins%2C+D">D. Meekins</a>, <a href="/search/nucl-ex?searchtype=author&query=McCaughan%2C+M">M. McCaughan</a>, <a href="/search/nucl-ex?searchtype=author&query=Moser%2C+D">D. Moser</a>, <a href="/search/nucl-ex?searchtype=author&query=O%27Connor%2C+T">T. O'Connor</a>, <a href="/search/nucl-ex?searchtype=author&query=Poelker%2C+M">M. Poelker</a>, <a href="/search/nucl-ex?searchtype=author&query=Rehm%2C+K+E">K. E. Rehm</a>, <a href="/search/nucl-ex?searchtype=author&query=Riordan%2C+S">S. Riordan</a>, <a href="/search/nucl-ex?searchtype=author&query=Suleiman%2C+R">R. Suleiman</a>, <a href="/search/nucl-ex?searchtype=author&query=Talwar%2C+R">R. Talwar</a>, <a href="/search/nucl-ex?searchtype=author&query=Ugalde%2C+C">C. Ugalde</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="2302.12760v2-abstract-short" style="display: inline;"> $^{15}$N($伪$,$纬$)$^{19}… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.12760v2-abstract-full').style.display = 'inline'; document.getElementById('2302.12760v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2302.12760v2-abstract-full" style="display: none;"> $^{15}$N($伪$,$纬$)$^{19}$F is believed to be the primary means of stellar nucleosynthesis of fluorine. Here we present the use of a single-fluid bubble chamber to measure the cross section of the time-inverse photo-dissociation reaction. The method benefits from a luminosity increase of several orders of magnitude due to the use of a thicker liquid target -- when compared to thin films or gas targets -- and from the reciprocity theorem. We discuss the results of an experiment at the Thomas Jefferson National Accelerator Facility, where the cross section of the photodisintegration process $^{19}$F($纬$, $伪$)$^{15}$N was measured by bombarding a superheated fluid of C$_3$F$_8$ with bremsstrahlung $纬$-rays produced by impinging a 4 - 5.5 MeV electron beam on a Cu radiator. From the photodissociation yield the cross section was extracted by performing a convolution with a Monte Carlo-generated $纬$-ray beam spectrum. The measurement produced a cross section that was then time inverted using the reciprocity theorem. The cross section for the $^{15}$N($伪$,$纬$)$^{19}$F reaction was determined down to a value in the range of hundreds of picobarns. With further improvements of the experimental setup the technique could potentially push cross section measurements down to the single picobarn range. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.12760v2-abstract-full').style.display = 'none'; document.getElementById('2302.12760v2-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 24 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">Corrected Typos. Accepted for Publication in Physical Review C</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.12160">arXiv:2212.12160</a> <span> [<a href="https://arxiv.org/pdf/2212.12160">pdf</a>, <a href="https://arxiv.org/format/2212.12160">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/PhysRevC.108.035202">10.1103/PhysRevC.108.035202 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of flavor asymmetry of light-quark sea in the proton with Drell-Yan dimuon production in $p+p$ and $p+d$ collisions at 120 GeV </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Dove%2C+J">J. Dove</a>, <a href="/search/nucl-ex?searchtype=author&query=Kerns%2C+B">B. Kerns</a>, <a href="/search/nucl-ex?searchtype=author&query=Leung%2C+C">C. Leung</a>, <a href="/search/nucl-ex?searchtype=author&query=McClellan%2C+R+E">R. E. McClellan</a>, <a href="/search/nucl-ex?searchtype=author&query=Miyasaka%2C+S">S. Miyasaka</a>, <a href="/search/nucl-ex?searchtype=author&query=Morton%2C+D+H">D. H. Morton</a>, <a href="/search/nucl-ex?searchtype=author&query=Nagai%2C+K">K. Nagai</a>, <a href="/search/nucl-ex?searchtype=author&query=Prasad%2C+S">S. Prasad</a>, <a href="/search/nucl-ex?searchtype=author&query=Sanftl%2C+F">F. Sanftl</a>, <a href="/search/nucl-ex?searchtype=author&query=Scott%2C+M+B+C">M. B. C. Scott</a>, <a href="/search/nucl-ex?searchtype=author&query=Tadepalli%2C+A+S">A. S. Tadepalli</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=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Ayuso%2C+C">C. Ayuso</a>, <a href="/search/nucl-ex?searchtype=author&query=Barker%2C+C+T">C. T. Barker</a>, <a href="/search/nucl-ex?searchtype=author&query=Brown%2C+C+N">C. N. Brown</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+T+H">T. H. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+W+C">W. C. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+A">A. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Christian%2C+D+C">D. C. Christian</a>, <a href="/search/nucl-ex?searchtype=author&query=Dannowitz%2C+B+P">B. P. Dannowitz</a>, <a href="/search/nucl-ex?searchtype=author&query=Daugherity%2C+M">M. Daugherity</a>, <a href="/search/nucl-ex?searchtype=author&query=Diefenthaler%2C+M">M. Diefenthaler</a>, <a href="/search/nucl-ex?searchtype=author&query=Fassi%2C+L+E">L. El Fassi</a>, <a href="/search/nucl-ex?searchtype=author&query=Geesaman%2C+D+F">D. F. Geesaman</a> , et al. (44 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="2212.12160v4-abstract-short" style="display: inline;"> Evidence for a flavor asymmetry between the $\bar u$ and $\bar d$ quark distributions in the proton has been found in deep-inelastic scattering and Drell-Yan experiments. The pronounced dependence of this flavor asymmetry on $x$ (fraction of nucleon momentum carried by partons) observed in the Fermilab E866 Drell-Yan experiment suggested a drop of the $\bar d\left(x\right) / \bar u\left(x\right)$… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.12160v4-abstract-full').style.display = 'inline'; document.getElementById('2212.12160v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.12160v4-abstract-full" style="display: none;"> Evidence for a flavor asymmetry between the $\bar u$ and $\bar d$ quark distributions in the proton has been found in deep-inelastic scattering and Drell-Yan experiments. The pronounced dependence of this flavor asymmetry on $x$ (fraction of nucleon momentum carried by partons) observed in the Fermilab E866 Drell-Yan experiment suggested a drop of the $\bar d\left(x\right) / \bar u\left(x\right)$ ratio in the $x > 0.15$ region. We report results from the SeaQuest Fermilab E906 experiment with improved statistical precision for $\bar d\left(x\right) / \bar u\left(x\right)$ in the large $x$ region up to $x=0.45$ using the 120 GeV proton beam. Two different methods for extracting the Drell-Yan cross section ratios, $蟽^{pd} /2 蟽^{pp}$, from the SeaQuest data give consistent results. The $\bar{d}\left(x\right) / \bar{u}\left(x\right)$ ratios and the $\bar d\left(x\right) - \bar u\left(x\right)$ differences are deduced from these cross section ratios for $0.13 < x < 0.45$. The SeaQuest and E866/NuSea $\bar{d}\left(x\right) / \bar{u}\left(x\right)$ ratios are in good agreement for the $x\lesssim 0.25$ region. The new SeaQuest data, however, show that $\bar d\left(x\right)$ continues to be greater than $\bar u\left(x\right)$ up to the highest $x$ value ($x = 0.45$). The new results on $\bar{d}\left(x\right) / \bar{u}\left(x\right)$ and $\bar{d}\left(x\right) - \bar{u}\left(x\right)$ are compared with various parton distribution functions and theoretical calculations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.12160v4-abstract-full').style.display = 'none'; document.getElementById('2212.12160v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 108, 035202 (2023) </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/2110.08399">arXiv:2110.08399</a> <span> [<a href="https://arxiv.org/pdf/2110.08399">pdf</a>, <a href="https://arxiv.org/format/2110.08399">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.104.065203">10.1103/PhysRevC.104.065203 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the EMC effect in light and heavy nuclei </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Bane%2C+J">J. Bane</a>, <a href="/search/nucl-ex?searchtype=author&query=Daniel%2C+A">A. Daniel</a>, <a href="/search/nucl-ex?searchtype=author&query=Fomin%2C+N">N. Fomin</a>, <a href="/search/nucl-ex?searchtype=author&query=Gaskell%2C+D">D. Gaskell</a>, <a href="/search/nucl-ex?searchtype=author&query=Seely%2C+J">J. Seely</a>, <a href="/search/nucl-ex?searchtype=author&query=Asaturyan%2C+R">R. Asaturyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W">W. Boeglin</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosted%2C+P">P. Bosted</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=Christy%2C+M+E">M. E. Christy</a>, <a href="/search/nucl-ex?searchtype=author&query=Connell%2C+S">S. Connell</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=Day%2C+D">D. Day</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunne%2C+J">J. Dunne</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutta%2C+D">D. Dutta</a>, <a href="/search/nucl-ex?searchtype=author&query=Fassi%2C+L+E">L. El Fassi</a>, <a href="/search/nucl-ex?searchtype=author&query=Ent%2C+R">R. Ent</a>, <a href="/search/nucl-ex?searchtype=author&query=Fenker%2C+H">H. Fenker</a>, <a href="/search/nucl-ex?searchtype=author&query=Gao%2C+H">H. Gao</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=Horn%2C+T">T. Horn</a>, <a href="/search/nucl-ex?searchtype=author&query=Hungerford%2C+E">E. Hungerford</a>, <a href="/search/nucl-ex?searchtype=author&query=Jones%2C+M+K">M. K. Jones</a> , et al. (32 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="2110.08399v2-abstract-short" style="display: inline;"> Inclusive electron scattering from nuclear targets has been measured to extract the nuclear dependence of the inelastic cross section in Hall C at the Thomas Jefferson National Accelerator facility. Results are presented for 2H, 3He, 4He, 9B, 12C, 63Cu and 197Au at an incident electron beam energy of 5.77 GeV for a range of momentum transfer from Q^2 = 2 to 7 (GeV/c)^2. These data improve the prec… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.08399v2-abstract-full').style.display = 'inline'; document.getElementById('2110.08399v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.08399v2-abstract-full" style="display: none;"> Inclusive electron scattering from nuclear targets has been measured to extract the nuclear dependence of the inelastic cross section in Hall C at the Thomas Jefferson National Accelerator facility. Results are presented for 2H, 3He, 4He, 9B, 12C, 63Cu and 197Au at an incident electron beam energy of 5.77 GeV for a range of momentum transfer from Q^2 = 2 to 7 (GeV/c)^2. These data improve the precision of the existing measurements of the EMC effect in the nuclear targets at large x, and allow for more detailed examinations of the A dependence of the EMC effect. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.08399v2-abstract-full').style.display = 'none'; document.getElementById('2110.08399v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 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">28 pages, 23 figures, archival paper for Jefferson Lab experiment E03-103</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2103.04024">arXiv:2103.04024</a> <span> [<a href="https://arxiv.org/pdf/2103.04024">pdf</a>, <a href="https://arxiv.org/ps/2103.04024">ps</a>, <a href="https://arxiv.org/format/2103.04024">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/10.1038/s41586-021-03282-z">10.1038/s41586-021-03282-z <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Asymmetry of Antimatter in the Proton </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Dove%2C+J">J. Dove</a>, <a href="/search/nucl-ex?searchtype=author&query=Kerns%2C+B">B. Kerns</a>, <a href="/search/nucl-ex?searchtype=author&query=McClellan%2C+R+E">R. E. McClellan</a>, <a href="/search/nucl-ex?searchtype=author&query=Miyasaka%2C+S">S. Miyasaka</a>, <a href="/search/nucl-ex?searchtype=author&query=Morton%2C+D+H">D. H. Morton</a>, <a href="/search/nucl-ex?searchtype=author&query=Nagai%2C+K">K. Nagai</a>, <a href="/search/nucl-ex?searchtype=author&query=Prasad%2C+S">S. Prasad</a>, <a href="/search/nucl-ex?searchtype=author&query=Sanftl%2C+F">F. Sanftl</a>, <a href="/search/nucl-ex?searchtype=author&query=Scott%2C+M+B+C">M. B. C. Scott</a>, <a href="/search/nucl-ex?searchtype=author&query=Tadepalli%2C+A+S">A. S. Tadepalli</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=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Ayuso%2C+C">C. Ayuso</a>, <a href="/search/nucl-ex?searchtype=author&query=Barker%2C+C+L">C. L. Barker</a>, <a href="/search/nucl-ex?searchtype=author&query=Brown%2C+C+N">C. N. Brown</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+W+C">W. C. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+A">A. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Christian%2C+D+C">D. C. Christian</a>, <a href="/search/nucl-ex?searchtype=author&query=Dannowitz%2C+B+P">B. P. Dannowitz</a>, <a href="/search/nucl-ex?searchtype=author&query=Daugherity%2C+M">M. Daugherity</a>, <a href="/search/nucl-ex?searchtype=author&query=Diefenthaler%2C+M">M. Diefenthaler</a>, <a href="/search/nucl-ex?searchtype=author&query=Fassi%2C+L+E">L. El Fassi</a>, <a href="/search/nucl-ex?searchtype=author&query=Geesaman%2C+D+F">D. F. Geesaman</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilman%2C+R">R. Gilman</a>, <a href="/search/nucl-ex?searchtype=author&query=Goto%2C+Y">Y. Goto</a> , et al. (42 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="2103.04024v1-abstract-short" style="display: inline;"> The fundamental building blocks of the proton, quarks and gluons, have been known for decades. However, we still have an incomplete theoretical and experimental understanding of how these particles and their dynamics give rise to the quantum bound state of the proton and its physical properties, such as for example its spin. The two up and the single down quarks that comprise the proton in the sim… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.04024v1-abstract-full').style.display = 'inline'; document.getElementById('2103.04024v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2103.04024v1-abstract-full" style="display: none;"> The fundamental building blocks of the proton, quarks and gluons, have been known for decades. However, we still have an incomplete theoretical and experimental understanding of how these particles and their dynamics give rise to the quantum bound state of the proton and its physical properties, such as for example its spin. The two up and the single down quarks that comprise the proton in the simplest picture account only for a few percent of the proton mass, the bulk of which is in the form of quark kinetic and potential energy and gluon energy from the strong force. An essential feature of this force, as described by quantum chromodynamics, is its ability to create matter-antimatter quark pairs inside the proton that exist only for a very short time. Their fleeting existence makes the antimatter quarks within protons difficult to study, but their existence is discernible in reactions where a matter-antimatter quark pair annihilates. In this picture of quark-antiquark creation by the strong force, the probability distributions as a function of momentum for the presence of up and down antimatter quarks should be nearly identical, since their masses are quite similar and small compared to the mass of the proton. In the present manuscript, we show evidence from muon pair production measurements that these distributions are significantly different, with more abundant down antimatter quarks than up antimatter quarks over a wide range of momentum. These results revive interest in several proposed mechanisms as the origin of this antimatter asymmetry in the proton that had been disfavored by the previous results and point to the future measurements that can distinguish between these mechanisms. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.04024v1-abstract-full').style.display = 'none'; document.getElementById('2103.04024v1-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, 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">10 pages, 5 figures, 5 tables; Matches published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-PUB-21-073-E </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature, 590, 561-565 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1911.11681">arXiv:1911.11681</a> <span> [<a href="https://arxiv.org/pdf/1911.11681">pdf</a>, <a href="https://arxiv.org/ps/1911.11681">ps</a>, <a href="https://arxiv.org/format/1911.11681">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.100.065204">10.1103/PhysRevC.100.065204 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Exclusive $蟺^+$ electroproduction off the proton from low to high -t </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Basnet%2C+S">S. Basnet</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=Li%2C+W+B">W. B. Li</a>, <a href="/search/nucl-ex?searchtype=author&query=Blok%2C+H+P">H. P. Blok</a>, <a href="/search/nucl-ex?searchtype=author&query=Gaskell%2C+D">D. Gaskell</a>, <a href="/search/nucl-ex?searchtype=author&query=Horn%2C+T">T. Horn</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=Beise%2C+E+J">E. J. Beise</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W">W. Boeglin</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=Breuer%2C+H">H. Breuer</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=Christy%2C+M+E">M. E. Christy</a>, <a href="/search/nucl-ex?searchtype=author&query=Ent%2C+R">R. Ent</a>, <a href="/search/nucl-ex?searchtype=author&query=Gibson%2C+E">E. Gibson</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=Jin%2C+S">S. Jin</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=Kim%2C+W">W. Kim</a>, <a href="/search/nucl-ex?searchtype=author&query=King%2C+P+M">P. M. King</a>, <a href="/search/nucl-ex?searchtype=author&query=Kovaltchouk%2C+V">V. Kovaltchouk</a>, <a href="/search/nucl-ex?searchtype=author&query=Liu%2C+J">J. Liu</a>, <a href="/search/nucl-ex?searchtype=author&query=Lolos%2C+G+J">G. J. Lolos</a> , et al. (27 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="1911.11681v1-abstract-short" style="display: inline;"> Background: Measurements of exclusive meson production are a useful tool in the study of hadronic structure. In particular, one can discern the relevant degrees of freedom at different distance scales through these studies. Purpose: To study the transition between non-perturbative and perturbative Quantum Chromodyanmics as the square of four momentum transfer to the struck proton, -t, is increased… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.11681v1-abstract-full').style.display = 'inline'; document.getElementById('1911.11681v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1911.11681v1-abstract-full" style="display: none;"> Background: Measurements of exclusive meson production are a useful tool in the study of hadronic structure. In particular, one can discern the relevant degrees of freedom at different distance scales through these studies. Purpose: To study the transition between non-perturbative and perturbative Quantum Chromodyanmics as the square of four momentum transfer to the struck proton, -t, is increased. Method: Cross sections for the $^1$H(e,e'$蟺^+$)n reaction were measured over the -t range of 0.272 to 2.127 GeV$^2$ with limited azimuthal coverage at fixed beam energy of 4.709 GeV, Q$^2$ of 2.4 GeV$^2$ and W of 2.0 GeV at the Thomas Jefferson National Accelerator Facility (JLab) Hall C. Results: The -t dependence of the measured $蟺^+$ electroproduction cross section generally agrees with prior data from JLab Halls B and C. The data are consistent with a Regge amplitude based theoretical model, but show poor agreement with a Generalized Parton Distribution (GPD) based model. Conclusion: The agreement of cross sections with prior data implies small contribution from the interference terms, and the confirmation of the change in t-slopes between the low and high -t regions previously observed in photoproduction indicates the changing nature of the electroproduction reaction in our kinematic regime. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.11681v1-abstract-full').style.display = 'none'; document.getElementById('1911.11681v1-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 November, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">9 pages, 5 figures Physical Review C, in press</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1910.00464">arXiv:1910.00464</a> <span> [<a href="https://arxiv.org/pdf/1910.00464">pdf</a>, <a href="https://arxiv.org/ps/1910.00464">ps</a>, <a href="https://arxiv.org/format/1910.00464">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"> Unique Access to u-Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Li%2C+W+B">W. B. Li</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=Blok%2C+H+P">H. P. Blok</a>, <a href="/search/nucl-ex?searchtype=author&query=Gaskell%2C+D">D. Gaskell</a>, <a href="/search/nucl-ex?searchtype=author&query=Horn%2C+T">T. Horn</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=Pire%2C+B">B. Pire</a>, <a href="/search/nucl-ex?searchtype=author&query=Szymanowski%2C+L">L. Szymanowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Laget%2C+J+-">J. -M. Laget</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=Beise%2C+E+J">E. J. Beise</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W">W. Boeglin</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=Breuer%2C+H">H. Breuer</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=Christy%2C+M+E">M. E. Christy</a>, <a href="/search/nucl-ex?searchtype=author&query=Ent%2C+R">R. Ent</a>, <a href="/search/nucl-ex?searchtype=author&query=Gibson%2C+E+F">E. F. Gibson</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=Jin%2C+S">S. Jin</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=Kim%2C+W">W. Kim</a>, <a href="/search/nucl-ex?searchtype=author&query=King%2C+P+M">P. M. King</a> , et al. (31 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="1910.00464v1-abstract-short" style="display: inline;"> Backward-angle meson electroproduction above the resonance region, which was previously ignored, is anticipated to offer unique access to the three quark plus sea component of the nucleon wave function. In this letter, we present the first complete separation of the four electromagnetic structure functions above the resonance region in exclusive omega electroproduction off the proton, e + p -> e'… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.00464v1-abstract-full').style.display = 'inline'; document.getElementById('1910.00464v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1910.00464v1-abstract-full" style="display: none;"> Backward-angle meson electroproduction above the resonance region, which was previously ignored, is anticipated to offer unique access to the three quark plus sea component of the nucleon wave function. In this letter, we present the first complete separation of the four electromagnetic structure functions above the resonance region in exclusive omega electroproduction off the proton, e + p -> e' + p + omega, at central Q^2 values of 1.60, 2.45 GeV^2 , at W = 2.21 GeV. The results of our pioneering -u ~ -u min study demonstrate the existence of a unanticipated backward-angle cross section peak and the feasibility of full L/T/LT/TT separations in this never explored kinematic territory. At Q^2 =2.45 GeV^2 , the observed dominance of sigma_T over sigma_L, is qualitatively consistent with the collinear QCD description in the near-backward regime, in which the scattering amplitude factorizes into a hard subprocess amplitude and baryon to meson transition distribution amplitudes (TDAs): universal non-perturbative objects only accessible through backward angle kinematics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.00464v1-abstract-full').style.display = 'none'; document.getElementById('1910.00464v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1908.11407">arXiv:1908.11407</a> <span> [<a href="https://arxiv.org/pdf/1908.11407">pdf</a>, <a href="https://arxiv.org/format/1908.11407">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.100.065802">10.1103/PhysRevC.100.065802 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Impact of $^{16}$O($e,e'伪$)$^{12}$C measurements on the $^{12}$C($伪,纬$)$^{16}$O astrophysical reaction rate </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Holt%2C+R+J">R. J. Holt</a>, <a href="/search/nucl-ex?searchtype=author&query=Filippone%2C+B+W">B. W. Filippone</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="1908.11407v1-abstract-short" style="display: inline;"> The $^{12}$C($伪,纬$)$^{16}$O reaction, an important component of stellar helium burning, has a key role in nuclear astrophysics. It has direct impact on the evolution and final state of massive stars and also influences the elemental abundances resulting from nucleosynthesis in such stars. Providing a reliable estimate for the energy dependence of this reaction at stellar helium burning temperature… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1908.11407v1-abstract-full').style.display = 'inline'; document.getElementById('1908.11407v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1908.11407v1-abstract-full" style="display: none;"> The $^{12}$C($伪,纬$)$^{16}$O reaction, an important component of stellar helium burning, has a key role in nuclear astrophysics. It has direct impact on the evolution and final state of massive stars and also influences the elemental abundances resulting from nucleosynthesis in such stars. Providing a reliable estimate for the energy dependence of this reaction at stellar helium burning temperatures has been a longstanding and important goal. In this work, we study the role of potential new measurements of the reaction, $^{16}$O($e,e'伪$)$^{12}$C reaction, in reducing the overall uncertainty. A multilevel $R$-matrix analysis is used to make extrapolations of the astrophysical S factor for the $^{12}$C($伪,纬$)$^{16}$O reaction to the stellar energy of 300 keV. The statistical precision of the $S$-factor extrapolation is determined by performing multiple fits to existing $E1$ and $E2$ ground state capture data, including the impact of possible future measurements of the $^{16}$O($e,e'伪$)$^{12}$C reaction. In particular, we consider a proposed MIT experiment that would make use of a high-intensity low-energy electron beam that impinges on a windowless oxygen gas target as a means to determine the total $E1$ and $E2$ cross sections for this reaction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1908.11407v1-abstract-full').style.display = 'none'; document.getElementById('1908.11407v1-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 August, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1908.09937">arXiv:1908.09937</a> <span> [<a href="https://arxiv.org/pdf/1908.09937">pdf</a>, <a href="https://arxiv.org/format/1908.09937">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/10.1088/1748-0221/14/11/P11017">10.1088/1748-0221/14/11/P11017 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A New Cryogenic Apparatus to Search for the Neutron Electric Dipole Moment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Ahmed%2C+M+W">M. W. Ahmed</a>, <a href="/search/nucl-ex?searchtype=author&query=Alarcon%2C+R">R. Alarcon</a>, <a href="/search/nucl-ex?searchtype=author&query=Aleksandrova%2C+A">A. Aleksandrova</a>, <a href="/search/nucl-ex?searchtype=author&query=Baessler%2C+S">S. Baessler</a>, <a href="/search/nucl-ex?searchtype=author&query=Barron-Palos%2C+L">L. Barron-Palos</a>, <a href="/search/nucl-ex?searchtype=author&query=Bartoszek%2C+L+M">L. M. Bartoszek</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+D+H">D. H. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Behzadipour%2C+M">M. Behzadipour</a>, <a href="/search/nucl-ex?searchtype=author&query=Berkutov%2C+I">I. Berkutov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bessuille%2C+J">J. Bessuille</a>, <a href="/search/nucl-ex?searchtype=author&query=Blatnik%2C+M">M. Blatnik</a>, <a href="/search/nucl-ex?searchtype=author&query=Broering%2C+M">M. Broering</a>, <a href="/search/nucl-ex?searchtype=author&query=Broussard%2C+L+J">L. J. Broussard</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Carr%2C+R">R. Carr</a>, <a href="/search/nucl-ex?searchtype=author&query=Cianciolo%2C+V">V. Cianciolo</a>, <a href="/search/nucl-ex?searchtype=author&query=Clayton%2C+S+M">S. M. Clayton</a>, <a href="/search/nucl-ex?searchtype=author&query=Cooper%2C+M+D">M. D. Cooper</a>, <a href="/search/nucl-ex?searchtype=author&query=Crawford%2C+C">C. Crawford</a>, <a href="/search/nucl-ex?searchtype=author&query=Currie%2C+S+A">S. A. Currie</a>, <a href="/search/nucl-ex?searchtype=author&query=Daurer%2C+C">C. Daurer</a>, <a href="/search/nucl-ex?searchtype=author&query=Dipert%2C+R">R. Dipert</a>, <a href="/search/nucl-ex?searchtype=author&query=Dow%2C+K">K. Dow</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutta%2C+D">D. Dutta</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Y. Efremenko</a> , et al. (69 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="1908.09937v3-abstract-short" style="display: inline;"> A cryogenic apparatus is described that enables a new experiment, nEDM@SNS, with a major improvement in sensitivity compared to the existing limit in the search for a neutron Electric Dipole Moment (EDM). It uses superfluid $^4$He to produce a high density of Ultra-Cold Neutrons (UCN) which are contained in a suitably coated pair of measurement cells. The experiment, to be operated at the Spallati… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1908.09937v3-abstract-full').style.display = 'inline'; document.getElementById('1908.09937v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1908.09937v3-abstract-full" style="display: none;"> A cryogenic apparatus is described that enables a new experiment, nEDM@SNS, with a major improvement in sensitivity compared to the existing limit in the search for a neutron Electric Dipole Moment (EDM). It uses superfluid $^4$He to produce a high density of Ultra-Cold Neutrons (UCN) which are contained in a suitably coated pair of measurement cells. The experiment, to be operated at the Spallation Neutron Source at Oak Ridge National Laboratory, uses polarized $^3$He from an Atomic Beam Source injected into the superfluid $^4$He and transported to the measurement cells as a co-magnetometer. The superfluid $^4$He is also used as an insulating medium allowing significantly higher electric fields, compared to previous experiments, to be maintained across the measurement cells. These features provide an ultimate statistical uncertainty for the EDM of $2-3\times 10^{-28}$ e-cm, with anticipated systematic uncertainties below this level. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1908.09937v3-abstract-full').style.display = 'none'; document.getElementById('1908.09937v3-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> 20 November, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 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">Journal ref:</span> Journal of Instrumentation, Vol 14, P11017, 2019 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1903.02700">arXiv:1903.02700</a> <span> [<a href="https://arxiv.org/pdf/1903.02700">pdf</a>, <a href="https://arxiv.org/format/1903.02700">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/10.1051/epjconf/201921902005">10.1051/epjconf/201921902005 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The neutron electric dipole moment experiment at the Spallation Neutron Source </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Leung%2C+K+K+H">K. K. H. Leung</a>, <a href="/search/nucl-ex?searchtype=author&query=Ahmed%2C+M">M. Ahmed</a>, <a href="/search/nucl-ex?searchtype=author&query=Alarcon%2C+R">R. Alarcon</a>, <a href="/search/nucl-ex?searchtype=author&query=Aleksandrova%2C+A">A. Aleksandrova</a>, <a href="/search/nucl-ex?searchtype=author&query=Bae%C3%9Fler%2C+S">S. Bae脽ler</a>, <a href="/search/nucl-ex?searchtype=author&query=Barr%C3%B3n-Palos%2C+L">L. Barr贸n-Palos</a>, <a href="/search/nucl-ex?searchtype=author&query=Bartoszek%2C+L">L. Bartoszek</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+D+H">D. H. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Behzadipour%2C+M">M. Behzadipour</a>, <a href="/search/nucl-ex?searchtype=author&query=Bessuille%2C+J">J. Bessuille</a>, <a href="/search/nucl-ex?searchtype=author&query=Blatnik%2C+M+A">M. A. Blatnik</a>, <a href="/search/nucl-ex?searchtype=author&query=Broering%2C+M">M. Broering</a>, <a href="/search/nucl-ex?searchtype=author&query=Broussard%2C+L+J">L. J. Broussard</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Carr%2C+R">R. Carr</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cianciolo%2C+V">V. Cianciolo</a>, <a href="/search/nucl-ex?searchtype=author&query=Clayton%2C+S+M">S. M. Clayton</a>, <a href="/search/nucl-ex?searchtype=author&query=Cooper%2C+M+D">M. D. Cooper</a>, <a href="/search/nucl-ex?searchtype=author&query=Crawford%2C+C">C. Crawford</a>, <a href="/search/nucl-ex?searchtype=author&query=Currie%2C+S+A">S. A. Currie</a>, <a href="/search/nucl-ex?searchtype=author&query=Daurer%2C+C">C. Daurer</a>, <a href="/search/nucl-ex?searchtype=author&query=Dipert%2C+R">R. Dipert</a>, <a href="/search/nucl-ex?searchtype=author&query=Dow%2C+K">K. Dow</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutta%2C+D">D. Dutta</a> , et al. (68 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="1903.02700v3-abstract-short" style="display: inline;"> Novel experimental techniques are required to make the next big leap in neutron electric dipole moment experimental sensitivity, both in terms of statistics and systematic error control. The nEDM experiment at the Spallation Neutron Source (nEDM@SNS) will implement the scheme of Golub & Lamoreaux [Phys. Rep., 237, 1 (1994)]. The unique properties of combining polarized ultracold neutrons, polarize… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1903.02700v3-abstract-full').style.display = 'inline'; document.getElementById('1903.02700v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1903.02700v3-abstract-full" style="display: none;"> Novel experimental techniques are required to make the next big leap in neutron electric dipole moment experimental sensitivity, both in terms of statistics and systematic error control. The nEDM experiment at the Spallation Neutron Source (nEDM@SNS) will implement the scheme of Golub & Lamoreaux [Phys. Rep., 237, 1 (1994)]. The unique properties of combining polarized ultracold neutrons, polarized $^3$He, and superfluid $^4$He will be exploited to provide a sensitivity to $\sim 10^{-28}\,e{\rm \,\cdot\, cm}$. Our cryogenic apparatus will deploy two small ($3\,{\rm L}$) measurement cells with a high density of ultracold neutrons produced and spin analyzed in situ. The electric field strength, precession time, magnetic shielding, and detected UCN number will all be enhanced compared to previous room temperature Ramsey measurements. Our $^3$He co-magnetometer offers unique control of systematic effects, in particular the Bloch-Siegert induced false EDM. Furthermore, there will be two distinct measurement modes: free precession and dressed spin. This will provide an important self-check of our results. Following five years of "critical component demonstration," our collaboration transitioned to a "large scale integration" phase in 2018. An overview of our measurement techniques, experimental design, and brief updates are described in these proceedings. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1903.02700v3-abstract-full').style.display = 'none'; document.getElementById('1903.02700v3-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 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 March, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">Submitted to proceedings of PPNS 2018 - International Workshop on Particle physics at Neutron Sources (https://www.webofconferences.org/epj-web-of-conferences-forthcoming-conferences/1148-ppns-2018)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1812.04582">arXiv:1812.04582</a> <span> [<a href="https://arxiv.org/pdf/1812.04582">pdf</a>, <a href="https://arxiv.org/format/1812.04582">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.99.055802">10.1103/PhysRevC.99.055802 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Impact of $^{16}$O($纬$,$伪$)$^{12}$C measurements on the $^{12}$C($伪,纬$)$^{16}$O astrophysical reaction rate </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Holt%2C+R+J">R. J. Holt</a>, <a href="/search/nucl-ex?searchtype=author&query=Filippone%2C+B+W">B. W. Filippone</a>, <a href="/search/nucl-ex?searchtype=author&query=Pieper%2C+S+C">Steven C. Pieper</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="1812.04582v2-abstract-short" style="display: inline;"> The $^{12}$C($伪,纬$)$^{16}$O reaction, an important component of stellar helium burning, plays a key role in nuclear astrophysics. It has direct impact on the evolution and final state of massive stars, while also influencing the elemental abundances resulting from nucleosynthesis in such stars. Providing a reliable estimate for the energy dependence of this reaction at stellar helium burning tempe… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.04582v2-abstract-full').style.display = 'inline'; document.getElementById('1812.04582v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1812.04582v2-abstract-full" style="display: none;"> The $^{12}$C($伪,纬$)$^{16}$O reaction, an important component of stellar helium burning, plays a key role in nuclear astrophysics. It has direct impact on the evolution and final state of massive stars, while also influencing the elemental abundances resulting from nucleosynthesis in such stars. Providing a reliable estimate for the energy dependence of this reaction at stellar helium burning temperatures has been a major goal for the field. In this work, we study the role of potential new measurements of the inverse reaction, $^{16}$O($纬,伪$)$^{12}$C, in reducing the overall uncertainty. A multilevel R-matrix analysis is used to make extrapolations of the astrophysical S factor for this reaction to the stellar energy of 300 keV. The statistical precision of the S-factor extrapolation is determined by performing multiple fits to existing E1 and E2 ground state capture data, including the impact of possible future measurements of the $^{16}$O($纬,伪$)$^{12}$C reaction. In particular, we consider a proposed JLab experiment that will make use of a high-intensity low-energy bremsstrahlung beam that impinges on an oxygen-rich single-fluid bubble chamber in order to measure the total cross section for the inverse reaction. The importance of low energy data as well as high precision data is investigated. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.04582v2-abstract-full').style.display = 'none'; document.getElementById('1812.04582v2-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 April, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 99, 055802 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1811.12167">arXiv:1811.12167</a> <span> [<a href="https://arxiv.org/pdf/1811.12167">pdf</a>, <a href="https://arxiv.org/format/1811.12167">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.2019.06.025">10.1016/j.nima.2019.06.025 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Density Changes in Low Pressure Gas Targets for Electron Scattering Experiments </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=Alsalmi%2C+S">S. Alsalmi</a>, <a href="/search/nucl-ex?searchtype=author&query=Meekins%2C+D">D. Meekins</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=Campbell%2C+J">J. Campbell</a>, <a href="/search/nucl-ex?searchtype=author&query=Castellanos%2C+J">J. Castellanos</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=Hague%2C+T">T. Hague</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=Holt%2C+R+J">R. J. Holt</a>, <a href="/search/nucl-ex?searchtype=author&query=Kutz%2C+T">T. Kutz</a>, <a href="/search/nucl-ex?searchtype=author&query=Li%2C+S">S. Li</a>, <a href="/search/nucl-ex?searchtype=author&query=Liu%2C+H">H. Liu</a>, <a href="/search/nucl-ex?searchtype=author&query=McClellan%2C+R+E">R. E. McClellan</a>, <a href="/search/nucl-ex?searchtype=author&query=Nycz%2C+M">M. Nycz</a>, <a href="/search/nucl-ex?searchtype=author&query=Nguyen%2C+D">D. Nguyen</a>, <a href="/search/nucl-ex?searchtype=author&query=Pandey%2C+B">B. Pandey</a>, <a href="/search/nucl-ex?searchtype=author&query=Pandey%2C+V">V. Pandey</a>, <a href="/search/nucl-ex?searchtype=author&query=Schmidt%2C+A">A. Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Su%2C+T">T. Su</a>, <a href="/search/nucl-ex?searchtype=author&query=Ye%2C+Z">Z. Ye</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="1811.12167v2-abstract-short" style="display: inline;"> A system of modular sealed gas target cells has been developed for use in electron scattering experiments at the Thomas Jefferson National Accelerator Facility (Jefferson Lab). This system was initially developed to complete the MARATHON experiment which required, among other species, tritium as a target material. Thus far, the cells have been loaded with the gas species 3H, 3He, 2H, 1H and 40Ar a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.12167v2-abstract-full').style.display = 'inline'; document.getElementById('1811.12167v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1811.12167v2-abstract-full" style="display: none;"> A system of modular sealed gas target cells has been developed for use in electron scattering experiments at the Thomas Jefferson National Accelerator Facility (Jefferson Lab). This system was initially developed to complete the MARATHON experiment which required, among other species, tritium as a target material. Thus far, the cells have been loaded with the gas species 3H, 3He, 2H, 1H and 40Ar and operated in nominal beam currents of up to 22.5 uA in Jefferson Lab's Hall A. While the gas density of the cells at the time of loading is known, the density of each gas varies uniquely when heated by the electron beam. To extract experimental cross sections using these cells, density dependence on beam current of each target fluid must be determined. In this study, data from measurements with several beam currents within the range of 2.5 to 22.5 uA on each target fluid are presented. Additionally, expressions for the beam current dependent fluid density of each target are developed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.12167v2-abstract-full').style.display = 'none'; document.getElementById('1811.12167v2-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 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 November, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 12 figures, 4 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-19-2850 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl. Instrum. Meth. A 940 (2019) 351-358 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1809.10176">arXiv:1809.10176</a> <span> [<a href="https://arxiv.org/pdf/1809.10176">pdf</a>, <a href="https://arxiv.org/format/1809.10176">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"> Sensitivity study for the $^{12}$C($伪,纬$)$^{16}$O astrophysical reaction rate </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Holt%2C+R+J">R. J. Holt</a>, <a href="/search/nucl-ex?searchtype=author&query=Filippone%2C+B+W">B. W. Filippone</a>, <a href="/search/nucl-ex?searchtype=author&query=Pieper%2C+S+C">Steven C. Pieper</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="1809.10176v1-abstract-short" style="display: inline;"> The $^{12}$C($伪,纬$)$^{16}$O reaction has a key role in nuclear astrophysics. A multilevel R-matrix analysis was used to make extrapolations of the astrophysical S factor for this reaction to the stellar energy of 300 keV. The statistical precision of the S-factor extrapolation was determined by performing multiple fits to existing randomized E1 and E2 ground state data, according to experimental e… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.10176v1-abstract-full').style.display = 'inline'; document.getElementById('1809.10176v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1809.10176v1-abstract-full" style="display: none;"> The $^{12}$C($伪,纬$)$^{16}$O reaction has a key role in nuclear astrophysics. A multilevel R-matrix analysis was used to make extrapolations of the astrophysical S factor for this reaction to the stellar energy of 300 keV. The statistical precision of the S-factor extrapolation was determined by performing multiple fits to existing randomized E1 and E2 ground state data, according to experimental errors. The impact of a future proposed experiment at Jefferson Laboratory (JLab) was assessed within this framework. The proposed JLab experiment will make use of a high-intensity low-energy bremsstrahlung beam that impinges on an oxygen-rich single-fluid bubble chamber in order to measure the total cross section for the inverse $^{16}$O($纬,伪$)$^{12}$C reaction. The importance of low energy data as well as high precision data was investigated. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.10176v1-abstract-full').style.display = 'none'; document.getElementById('1809.10176v1-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 September, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Talk presented CIPANP2018. 8 pages, LATEX, 3 pdf figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CIPANP2018-Holt </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1801.01536">arXiv:1801.01536</a> <span> [<a href="https://arxiv.org/pdf/1801.01536">pdf</a>, <a href="https://arxiv.org/ps/1801.01536">ps</a>, <a href="https://arxiv.org/format/1801.01536">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.97.025204">10.1103/PhysRevC.97.025204 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Separated Kaon Electroproduction Cross Section and the Kaon Form Factor from 6 GeV JLab Data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Carmignotto%2C+M">M. Carmignotto</a>, <a href="/search/nucl-ex?searchtype=author&query=Ali%2C+S">S. Ali</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=Barrett%2C+B">B. Barrett</a>, <a href="/search/nucl-ex?searchtype=author&query=Beise%2C+E+J">E. J. Beise</a>, <a href="/search/nucl-ex?searchtype=author&query=Blok%2C+H+P">H. P. Blok</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W">W. Boeglin</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=Breuer%2C+H">H. Breuer</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=Christy%2C+M+E">M. E. Christy</a>, <a href="/search/nucl-ex?searchtype=author&query=Dittmann%2C+A">A. Dittmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Ent%2C+R">R. Ent</a>, <a href="/search/nucl-ex?searchtype=author&query=Fenker%2C+H">H. Fenker</a>, <a href="/search/nucl-ex?searchtype=author&query=Gaskell%2C+D">D. Gaskell</a>, <a href="/search/nucl-ex?searchtype=author&query=Gibson%2C+E">E. Gibson</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=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=Jin%2C+S">S. Jin</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=Kim%2C+W">W. Kim</a>, <a href="/search/nucl-ex?searchtype=author&query=King%2C+P+M">P. M. King</a> , et al. (35 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1801.01536v1-abstract-short" style="display: inline;"> The $^{1}H$($e,e^\prime K^+$)$螞$ reaction was studied as a function of the Mandelstam variable $-t$ using data from the E01-004 (FPI-2) and E93-018 experiments that were carried out in Hall C at the 6 GeV Jefferson Lab. The cross section was fully separated into longitudinal and transverse components, and two interference terms at four-momentum transfers $Q^2$ of 1.00, 1.36 and 2.07 GeV$^2$. The k… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1801.01536v1-abstract-full').style.display = 'inline'; document.getElementById('1801.01536v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1801.01536v1-abstract-full" style="display: none;"> The $^{1}H$($e,e^\prime K^+$)$螞$ reaction was studied as a function of the Mandelstam variable $-t$ using data from the E01-004 (FPI-2) and E93-018 experiments that were carried out in Hall C at the 6 GeV Jefferson Lab. The cross section was fully separated into longitudinal and transverse components, and two interference terms at four-momentum transfers $Q^2$ of 1.00, 1.36 and 2.07 GeV$^2$. The kaon form factor was extracted from the longitudinal cross section using the Regge model by Vanderhaeghen, Guidal, and Laget. The results establish the method, previously used successfully for pion analyses, for extracting the kaon form factor. Data from 12 GeV Jefferson Lab experiments are expected to have sufficient precision to distinguish between theoretical predictions, for example recent perturbative QCD calculations with modern parton distribution amplitudes. The leading-twist behavior for light mesons is predicted to set in for values of $Q^2$ between 5-10 GeV$^2$, which makes data in the few GeV regime particularly interesting. The $Q^2$ dependence at fixed $x$ and $-t$ of the longitudinal cross section we extracted seems consistent with the QCD factorization prediction within the experimental uncertainty. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1801.01536v1-abstract-full').style.display = 'none'; document.getElementById('1801.01536v1-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 January, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 97, 025204 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1706.09990">arXiv:1706.09990</a> <span> [<a href="https://arxiv.org/pdf/1706.09990">pdf</a>, <a href="https://arxiv.org/format/1706.09990">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> <p class="title is-5 mathjax"> The SeaQuest Spectrometer at Fermilab </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=SeaQuest+Collaboration"> SeaQuest Collaboration</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=Arrington%2C+J+R">J. R. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Ayuso%2C+C">C. Ayuso</a>, <a href="/search/nucl-ex?searchtype=author&query=Bowen%2C+B+M">B. M. Bowen</a>, <a href="/search/nucl-ex?searchtype=author&query=Bowen%2C+M+L">M. L. Bowen</a>, <a href="/search/nucl-ex?searchtype=author&query=Bowling%2C+K+L">K. L. Bowling</a>, <a href="/search/nucl-ex?searchtype=author&query=Brown%2C+A+W">A. W. Brown</a>, <a href="/search/nucl-ex?searchtype=author&query=Brown%2C+C+N">C. N. Brown</a>, <a href="/search/nucl-ex?searchtype=author&query=Byrd%2C+R">R. Byrd</a>, <a href="/search/nucl-ex?searchtype=author&query=Carlisle%2C+R+E">R. E. Carlisle</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+T">T. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+W+-">W. -C. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+A">A. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+J+-">J. -Y. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Christian%2C+D+C">D. C. Christian</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+X">X. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Dannowitz%2C+B+P">B. P. Dannowitz</a>, <a href="/search/nucl-ex?searchtype=author&query=Daugherity%2C+M">M. Daugherity</a>, <a href="/search/nucl-ex?searchtype=author&query=Diefenthaler%2C+M">M. Diefenthaler</a>, <a href="/search/nucl-ex?searchtype=author&query=Dove%2C+J">J. Dove</a>, <a href="/search/nucl-ex?searchtype=author&query=Durandet%2C+C">C. Durandet</a>, <a href="/search/nucl-ex?searchtype=author&query=Fassi%2C+L+E">L. El Fassi</a>, <a href="/search/nucl-ex?searchtype=author&query=Erdos%2C+E">E. Erdos</a>, <a href="/search/nucl-ex?searchtype=author&query=Fox%2C+D+M">D. M. Fox</a> , et al. (73 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1706.09990v2-abstract-short" style="display: inline;"> The SeaQuest spectrometer at Fermilab was designed to detect oppositely-charged pairs of muons (dimuons) produced by interactions between a 120 GeV proton beam and liquid hydrogen, liquid deuterium and solid nuclear targets. The primary physics program uses the Drell-Yan process to probe antiquark distributions in the target nucleon. The spectrometer consists of a target system, two dipole magnets… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.09990v2-abstract-full').style.display = 'inline'; document.getElementById('1706.09990v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1706.09990v2-abstract-full" style="display: none;"> The SeaQuest spectrometer at Fermilab was designed to detect oppositely-charged pairs of muons (dimuons) produced by interactions between a 120 GeV proton beam and liquid hydrogen, liquid deuterium and solid nuclear targets. The primary physics program uses the Drell-Yan process to probe antiquark distributions in the target nucleon. The spectrometer consists of a target system, two dipole magnets and four detector stations. The upstream magnet is a closed-aperture solid iron magnet which also serves as the beam dump, while the second magnet is an open aperture magnet. Each of the detector stations consists of scintillator hodoscopes and a high-resolution tracking device. The FPGA-based trigger compares the hodoscope signals to a set of pre-programmed roads to determine if the event contains oppositely-signed, high-mass muon pairs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.09990v2-abstract-full').style.display = 'none'; document.getElementById('1706.09990v2-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, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 June, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-PUB-17-209-E </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1608.08632">arXiv:1608.08632</a> <span> [<a href="https://arxiv.org/pdf/1608.08632">pdf</a>, <a href="https://arxiv.org/format/1608.08632">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="Cosmology and Nongalactic Astrophysics">astro-ph.CO</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"> Dark Sectors 2016 Workshop: Community Report </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Alexander%2C+J">Jim Alexander</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">Marco Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Echenard%2C+B">Bertrand Echenard</a>, <a href="/search/nucl-ex?searchtype=author&query=Essig%2C+R">Rouven Essig</a>, <a href="/search/nucl-ex?searchtype=author&query=Graham%2C+M">Matthew Graham</a>, <a href="/search/nucl-ex?searchtype=author&query=Izaguirre%2C+E">Eder Izaguirre</a>, <a href="/search/nucl-ex?searchtype=author&query=Jaros%2C+J">John Jaros</a>, <a href="/search/nucl-ex?searchtype=author&query=Krnjaic%2C+G">Gordan Krnjaic</a>, <a href="/search/nucl-ex?searchtype=author&query=Mardon%2C+J">Jeremy Mardon</a>, <a href="/search/nucl-ex?searchtype=author&query=Morrissey%2C+D">David Morrissey</a>, <a href="/search/nucl-ex?searchtype=author&query=Nelson%2C+T">Tim Nelson</a>, <a href="/search/nucl-ex?searchtype=author&query=Perelstein%2C+M">Maxim Perelstein</a>, <a href="/search/nucl-ex?searchtype=author&query=Pyle%2C+M">Matt Pyle</a>, <a href="/search/nucl-ex?searchtype=author&query=Ritz%2C+A">Adam Ritz</a>, <a href="/search/nucl-ex?searchtype=author&query=Schuster%2C+P">Philip Schuster</a>, <a href="/search/nucl-ex?searchtype=author&query=Shuve%2C+B">Brian Shuve</a>, <a href="/search/nucl-ex?searchtype=author&query=Toro%2C+N">Natalia Toro</a>, <a href="/search/nucl-ex?searchtype=author&query=Van+De+Water%2C+R+G">Richard G Van De Water</a>, <a href="/search/nucl-ex?searchtype=author&query=Akerib%2C+D">Daniel Akerib</a>, <a href="/search/nucl-ex?searchtype=author&query=An%2C+H">Haipeng An</a>, <a href="/search/nucl-ex?searchtype=author&query=Aniol%2C+K">Konrad Aniol</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">Isaac J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Asner%2C+D+M">David M. Asner</a>, <a href="/search/nucl-ex?searchtype=author&query=Back%2C+H+O">Henning O. Back</a>, <a href="/search/nucl-ex?searchtype=author&query=Baker%2C+K">Keith Baker</a> , et al. (179 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="1608.08632v1-abstract-short" style="display: inline;"> This report, based on the Dark Sectors workshop at SLAC in April 2016, summarizes the scientific importance of searches for dark sector dark matter and forces at masses beneath the weak-scale, the status of this broad international field, the important milestones motivating future exploration, and promising experimental opportunities to reach these milestones over the next 5-10 years. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1608.08632v1-abstract-full" style="display: none;"> This report, based on the Dark Sectors workshop at SLAC in April 2016, summarizes the scientific importance of searches for dark sector dark matter and forces at masses beneath the weak-scale, the status of this broad international field, the important milestones motivating future exploration, and promising experimental opportunities to reach these milestones over the next 5-10 years. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.08632v1-abstract-full').style.display = 'none'; document.getElementById('1608.08632v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 August, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">66 pages, 15 figures, 3 tables. Workshop website and agenda: http://www-conf.slac.stanford.edu/darksectors2016/ https://indico.cern.ch/event/507783/ Editors: J. Alexander, M. Battaglieri, B. Echenard, R. Essig, M. Graham, E. Izaguirre, J. Jaros, G. Krnjaic, J. Mardon, D. Morrissey, T. Nelson, M. Perelstein, M. Pyle, A. Ritz, P. Schuster, B. Shuve, N. Toro, R. Van De Water</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1606.04931">arXiv:1606.04931</a> <span> [<a href="https://arxiv.org/pdf/1606.04931">pdf</a>, <a href="https://arxiv.org/format/1606.04931">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="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.94.025501">10.1103/PhysRevC.94.025501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Improved limit on the $^{225}$Ra electric dipole moment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Bishof%2C+M">Michael Bishof</a>, <a href="/search/nucl-ex?searchtype=author&query=Parker%2C+R+H">Richard H. Parker</a>, <a href="/search/nucl-ex?searchtype=author&query=Bailey%2C+K+G">Kevin G. Bailey</a>, <a href="/search/nucl-ex?searchtype=author&query=Greene%2C+J+P">John P. Greene</a>, <a href="/search/nucl-ex?searchtype=author&query=Holt%2C+R+J">Roy J. Holt</a>, <a href="/search/nucl-ex?searchtype=author&query=Kalita%2C+M+R">Mukut R. Kalita</a>, <a href="/search/nucl-ex?searchtype=author&query=Korsch%2C+W">Wolfgang Korsch</a>, <a href="/search/nucl-ex?searchtype=author&query=Lemke%2C+N+D">Nathan D. Lemke</a>, <a href="/search/nucl-ex?searchtype=author&query=Lu%2C+Z">Zheng-Tian Lu</a>, <a href="/search/nucl-ex?searchtype=author&query=Mueller%2C+P">Peter Mueller</a>, <a href="/search/nucl-ex?searchtype=author&query=O%27Connor%2C+T+P">Thomas P. O'Connor</a>, <a href="/search/nucl-ex?searchtype=author&query=Singh%2C+J+T">Jaideep T. Singh</a>, <a href="/search/nucl-ex?searchtype=author&query=Dietrich%2C+M+R">Matthew R. Dietrich</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="1606.04931v1-abstract-short" style="display: inline;"> Background: Octupole-deformed nuclei, such as that of $^{225}$Ra, are expected to amplify observable atomic electric dipole moments (EDMs) that arise from time-reversal and parity-violating interactions in the nuclear medium. In 2015, we reported the first "proof-of-principle" measurement of the $^{225}$Ra atomic EDM. Purpose: This work reports on the first of several experimental upgrades to impr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1606.04931v1-abstract-full').style.display = 'inline'; document.getElementById('1606.04931v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1606.04931v1-abstract-full" style="display: none;"> Background: Octupole-deformed nuclei, such as that of $^{225}$Ra, are expected to amplify observable atomic electric dipole moments (EDMs) that arise from time-reversal and parity-violating interactions in the nuclear medium. In 2015, we reported the first "proof-of-principle" measurement of the $^{225}$Ra atomic EDM. Purpose: This work reports on the first of several experimental upgrades to improve the statistical sensitivity of our $^{225}$Ra EDM measurements by orders of magnitude and evaluates systematic effects that contribute to current and future levels of experimental sensitivity. Method: Laser-cooled and trapped $^{225}$Ra atoms are held between two high voltage electrodes in an ultra high vacuum chamber at the center of a magnetically shielded environment. We observe Larmor precession in a uniform magnetic field using nuclear-spin-dependent laser light scattering and look for a phase shift proportional to the applied electric field, which indicates the existence of an EDM. The main improvement to our measurement technique is an order of magnitude increase in spin precession time, which is enabled by an improved vacuum system and a reduction in trap-induced heating. Results: We have measured the $^{225}$Ra atomic EDM to be less than $1.4\times10^{-23}$ $e$ cm (95% confidence upper limit), which is a factor of 36 improvement over our previous result. Conclusions: Our evaluation of systematic effects shows that this measurement is completely limited by statistical uncertainty. Combining this measurement technique with planned experimental upgrades we project a statistical sensitivity at the $1\times10^{-28}$ $e$ cm level and a total systematic uncertainty at the $4\times10^{-29}$ $e$ cm level. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1606.04931v1-abstract-full').style.display = 'none'; document.getElementById('1606.04931v1-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 June, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2016. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1606.02614">arXiv:1606.02614</a> <span> [<a href="https://arxiv.org/pdf/1606.02614">pdf</a>, <a href="https://arxiv.org/format/1606.02614">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.97.045204">10.1103/PhysRevC.97.045204 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurements of the Separated Longitudinal Structure Function F_L from Hydrogen and Deuterium Targets at Low Q^2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Tvaskis%2C+V">V. Tvaskis</a>, <a href="/search/nucl-ex?searchtype=author&query=Tvaskis%2C+A">A. Tvaskis</a>, <a href="/search/nucl-ex?searchtype=author&query=Niculescu%2C+I">I. Niculescu</a>, <a href="/search/nucl-ex?searchtype=author&query=Abbott%2C+D">D. Abbott</a>, <a href="/search/nucl-ex?searchtype=author&query=Adams%2C+G+S">G. S. Adams</a>, <a href="/search/nucl-ex?searchtype=author&query=Afanasev%2C+A">A. Afanasev</a>, <a href="/search/nucl-ex?searchtype=author&query=Ahmidouch%2C+A">A. Ahmidouch</a>, <a href="/search/nucl-ex?searchtype=author&query=Angelescu%2C+T">T. Angelescu</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+R">R. Asaturyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Avery%2C+S">S. Avery</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=Benmouna%2C+N">N. Benmouna</a>, <a href="/search/nucl-ex?searchtype=author&query=Berman%2C+B+L">B. L. Berman</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A">A. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Blok%2C+H+P">H. P. Blok</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W+U">W. U. Boeglin</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosted%2C+P+E">P. E. Bosted</a>, <a href="/search/nucl-ex?searchtype=author&query=Brash%2C+E">E. Brash</a>, <a href="/search/nucl-ex?searchtype=author&query=Breuer%2C+H">H. Breuer</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+G">G. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chant%2C+N">N. Chant</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=Connell%2C+S+H">S. H. Connell</a>, <a href="/search/nucl-ex?searchtype=author&query=Dalton%2C+M+M">M. M. Dalton</a> , et al. (78 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="1606.02614v1-abstract-short" style="display: inline;"> Structure functions, as measured in lepton-nucleon scattering, have proven to be very useful in studying the quark dynamics within the nucleon. However, it is experimentally difficult to separately determine the longitudinal and transverse structure functions, and consequently there are substantially less data available for the longitudinal structure function in particular. Here we present separat… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1606.02614v1-abstract-full').style.display = 'inline'; document.getElementById('1606.02614v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1606.02614v1-abstract-full" style="display: none;"> Structure functions, as measured in lepton-nucleon scattering, have proven to be very useful in studying the quark dynamics within the nucleon. However, it is experimentally difficult to separately determine the longitudinal and transverse structure functions, and consequently there are substantially less data available for the longitudinal structure function in particular. Here we present separated structure functions for hydrogen and deuterium at low four--momentum transfer squared, Q^2< 1 GeV^2, and compare these with parton distribution parameterizations and a k_T factorization approach. While differences are found, the parameterizations generally agree with the data even at the very low Q^2 scale of the data. The deuterium data show a smaller longitudinal structure function, and smaller ratio of longitudinal to transverse cross section R, than the proton. This suggests either an unexpected difference in R for the proton and neutron or a suppression of the gluonic distribution in nuclei. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1606.02614v1-abstract-full').style.display = 'none'; document.getElementById('1606.02614v1-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 June, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 7 figures, 2 data tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 97, 045204 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1504.07477">arXiv:1504.07477</a> <span> [<a href="https://arxiv.org/pdf/1504.07477">pdf</a>, <a href="https://arxiv.org/format/1504.07477">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="Atomic Physics">physics.atom-ph</span> </div> </div> <p class="title is-5 mathjax"> First Measurement of the Atomic Electric Dipole Moment of $^{225}$Ra </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Parker%2C+R+H">R. H. Parker</a>, <a href="/search/nucl-ex?searchtype=author&query=Dietrich%2C+M+R">M. R. Dietrich</a>, <a href="/search/nucl-ex?searchtype=author&query=Kalita%2C+M+R">M. R. Kalita</a>, <a href="/search/nucl-ex?searchtype=author&query=Lemke%2C+N+D">N. D. Lemke</a>, <a href="/search/nucl-ex?searchtype=author&query=Bailey%2C+K+G">K. G. Bailey</a>, <a href="/search/nucl-ex?searchtype=author&query=Bishof%2C+M+N">M. N. Bishof</a>, <a href="/search/nucl-ex?searchtype=author&query=Greene%2C+J+P">J. P. Greene</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=Korsch%2C+W">W. Korsch</a>, <a href="/search/nucl-ex?searchtype=author&query=Lu%2C+Z+-">Z. -T. Lu</a>, <a href="/search/nucl-ex?searchtype=author&query=Mueller%2C+P">P. Mueller</a>, <a href="/search/nucl-ex?searchtype=author&query=O%27Connor%2C+T+P">T. P. O'Connor</a>, <a href="/search/nucl-ex?searchtype=author&query=Singh%2C+J+T">J. T. Singh</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="1504.07477v2-abstract-short" style="display: inline;"> The radioactive radium-225 ($^{225}$Ra) atom is a favorable case to search for a permanent electric dipole moment (EDM). Due to its strong nuclear octupole deformation and large atomic mass, $^{225}$Ra is particularly sensitive to interactions in the nuclear medium that violate both time-reversal symmetry and parity. We have developed a cold-atom technique to study the spin precession of $^{225}$R… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1504.07477v2-abstract-full').style.display = 'inline'; document.getElementById('1504.07477v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1504.07477v2-abstract-full" style="display: none;"> The radioactive radium-225 ($^{225}$Ra) atom is a favorable case to search for a permanent electric dipole moment (EDM). Due to its strong nuclear octupole deformation and large atomic mass, $^{225}$Ra is particularly sensitive to interactions in the nuclear medium that violate both time-reversal symmetry and parity. We have developed a cold-atom technique to study the spin precession of $^{225}$Ra atoms held in an optical dipole trap, and demonstrated the principle of this method by completing the first measurement of its atomic EDM, reaching an upper limit of $|$$d$($^{225}$Ra)$|$ $<$ $5.0\!\times\!10^{-22}$ $e \cdot$cm (95$\%$ confidence). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1504.07477v2-abstract-full').style.display = 'none'; document.getElementById('1504.07477v2-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 April, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 April, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2015. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1501.06883">arXiv:1501.06883</a> <span> [<a href="https://arxiv.org/pdf/1501.06883">pdf</a>, <a href="https://arxiv.org/ps/1501.06883">ps</a>, <a href="https://arxiv.org/format/1501.06883">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 Methods for Astrophysics">astro-ph.IM</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.2015.01.060">10.1016/j.nima.2015.01.060 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Bubble Chambers for Experiments in Nuclear Astrophysics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=DiGiovine%2C+B">B. DiGiovine</a>, <a href="/search/nucl-ex?searchtype=author&query=Henderson%2C+D">D. Henderson</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=Rehm%2C+K+E">K. E. Rehm</a>, <a href="/search/nucl-ex?searchtype=author&query=Raut%2C+R">R. Raut</a>, <a href="/search/nucl-ex?searchtype=author&query=Robinson%2C+A">A. Robinson</a>, <a href="/search/nucl-ex?searchtype=author&query=Sonnenschein%2C+A">A. Sonnenschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Rusev%2C+G">G. Rusev</a>, <a href="/search/nucl-ex?searchtype=author&query=Tonchev%2C+A+P">A. P. Tonchev</a>, <a href="/search/nucl-ex?searchtype=author&query=Ugalde%2C+C">C. Ugalde</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="1501.06883v1-abstract-short" style="display: inline;"> A bubble chamber has been developed to be used as an active target system for low energy nuclear astrophysics experiments. Adopting ideas from dark matter detection with superheated liquids, a detector system compatible with gamma-ray beams has been developed. This detector alleviates some of the limitations encountered in standard measurements of the minute cross sections of interest to stellar e… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.06883v1-abstract-full').style.display = 'inline'; document.getElementById('1501.06883v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1501.06883v1-abstract-full" style="display: none;"> A bubble chamber has been developed to be used as an active target system for low energy nuclear astrophysics experiments. Adopting ideas from dark matter detection with superheated liquids, a detector system compatible with gamma-ray beams has been developed. This detector alleviates some of the limitations encountered in standard measurements of the minute cross sections of interest to stellar environments. While the astrophysically relevant nuclear reaction processes at hydrostatic burning temperatures are dominated by radiative captures, in this experimental scheme we measure the time-reversed processes. Such photodisintegrations allow us to compute the radiative capture cross sections when transitions to excited states of the reaction products are negligible. Due to the transformation of phase space, the photodisintegration cross sections are up to two orders of magnitude higher. The main advantage of the new target-detector system is a density several orders of magnitude higher than conventional gas targets. Also, the detector is virtually insensitive to the gamma-ray beam itself, thus allowing us to detect only the products of the nuclear reaction of interest. The development and the operation as well as the advantages and disadvantages of the bubble chamber are discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.06883v1-abstract-full').style.display = 'none'; document.getElementById('1501.06883v1-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, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2015. </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 manuscript in Nuclear Instruments and Methods in Physics Research Section A. 12 pages, 14 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">MSC Class:</span> 85.05 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1412.5140">arXiv:1412.5140</a> <span> [<a href="https://arxiv.org/pdf/1412.5140">pdf</a>, <a href="https://arxiv.org/ps/1412.5140">ps</a>, <a href="https://arxiv.org/format/1412.5140">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.91.015202">10.1103/PhysRevC.91.015202 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Separated Response Functions in Exclusive, Forward $蟺^{\pm}$ Electroproduction on Deuterium </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Huber%2C+G+M">G. M. Huber</a>, <a href="/search/nucl-ex?searchtype=author&query=Blok%2C+H+P">H. P. Blok</a>, <a href="/search/nucl-ex?searchtype=author&query=Butuceanu%2C+C">C. Butuceanu</a>, <a href="/search/nucl-ex?searchtype=author&query=Gaskell%2C+D">D. Gaskell</a>, <a href="/search/nucl-ex?searchtype=author&query=Horn%2C+T">T. Horn</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=Abbott%2C+D">D. Abbott</a>, <a href="/search/nucl-ex?searchtype=author&query=Aniol%2C+K">K. Aniol</a>, <a href="/search/nucl-ex?searchtype=author&query=Anklin%2C+H">H. Anklin</a>, <a href="/search/nucl-ex?searchtype=author&query=Armstrong%2C+C">C. Armstrong</a>, <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Assamagan%2C+K">K. Assamagan</a>, <a href="/search/nucl-ex?searchtype=author&query=Avery%2C+S">S. Avery</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=Barrett%2C+B">B. Barrett</a>, <a href="/search/nucl-ex?searchtype=author&query=Beise%2C+E+J">E. J. Beise</a>, <a href="/search/nucl-ex?searchtype=author&query=Bochna%2C+C">C. Bochna</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W">W. Boeglin</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=Breuer%2C+H">H. Breuer</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=Chant%2C+N">N. Chant</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=Dunne%2C+J">J. Dunne</a>, <a href="/search/nucl-ex?searchtype=author&query=Eden%2C+T">T. Eden</a> , et al. (64 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="1412.5140v1-abstract-short" style="display: inline;"> Background: Measurements of forward exclusive meson production at different squared four-momenta of the exchanged virtual photon, $Q^2$, and at different four-momentum transfer, t, can be used to probe QCD's transition from meson-nucleon degrees of freedom at long distances to quark-gluon degrees of freedom at short scales. Ratios of separated response functions in $蟺^-$ and $蟺^+$ electroproductio… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1412.5140v1-abstract-full').style.display = 'inline'; document.getElementById('1412.5140v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1412.5140v1-abstract-full" style="display: none;"> Background: Measurements of forward exclusive meson production at different squared four-momenta of the exchanged virtual photon, $Q^2$, and at different four-momentum transfer, t, can be used to probe QCD's transition from meson-nucleon degrees of freedom at long distances to quark-gluon degrees of freedom at short scales. Ratios of separated response functions in $蟺^-$ and $蟺^+$ electroproduction are particularly informative. The ratio for transverse photons may allow this transition to be more easily observed, while the ratio for longitudinal photons provides a crucial verification of the assumed pole dominance, needed for reliable extraction of the pion form factor from electroproduction data. Method: Data were acquired with 2.6-5.2 GeV electron beams and the HMS+SOS spectrometers in Jefferson Lab Hall C, at central $Q^2$ values of 0.6, 1.0, 1.6 GeV$^2$ at W=1.95 GeV, and $Q^2$=2.45 GeV$^2$ at W=2.22 GeV. There was significant coverage in $蠁$ and $蔚$, which allowed separation of $蟽_{L,T,LT,TT}$. Results: $蟽_L$ shows a clear signature of the pion pole, with a sharp rise at small -t. In contrast, $蟽_T$ is much flatter versus t. The longitudinal/transverse ratios evolve with $Q^2$ and t, and at the highest $Q^2$=2.45 GeV$^2$ show a slight enhancement for $蟺^-$ production compared to $蟺^+$. The $蟺^-/蟺^+$ ratio for transverse photons exhibits only a small $Q^2$-dependence, following a nearly universal curve with t, with a steep transition to a value of about 0.25, consistent with s-channel quark knockout. The $蟽_{TT}/蟽_T$ ratio also drops rapidly with $Q^2$, qualitatively consistent with s-channel helicity conservation. The $蟺^-/蟺^+$ ratio for longitudinal photons indicates a small isoscalar contamination at W=1.95 GeV, consistent with what was observed in our earlier determination of the pion form factor at these kinematics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1412.5140v1-abstract-full').style.display = 'none'; document.getElementById('1412.5140v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 December, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">25 pages, 16 figures, 6 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review C 91 (2015) 015202 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1411.7372">arXiv:1411.7372</a> <span> [<a href="https://arxiv.org/pdf/1411.7372">pdf</a>, <a href="https://arxiv.org/format/1411.7372">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.114.062005">10.1103/PhysRevLett.114.062005 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the two-photon exchange contribution to the elastic $e^{\pm}p$ scattering cross sections at the VEPP-3 storage ring </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Rachek%2C+I+A">I. A. Rachek</a>, <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Dmitriev%2C+V+F">V. F. Dmitriev</a>, <a href="/search/nucl-ex?searchtype=author&query=Gauzshtein%2C+V+V">V. V. Gauzshtein</a>, <a href="/search/nucl-ex?searchtype=author&query=Gerasimov%2C+R+E">R. E. Gerasimov</a>, <a href="/search/nucl-ex?searchtype=author&query=Gramolin%2C+A+V">A. V. Gramolin</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=Kaminskiy%2C+V+V">V. V. Kaminskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Lazarenko%2C+B+A">B. A. Lazarenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Mishnev%2C+S+I">S. I. Mishnev</a>, <a href="/search/nucl-ex?searchtype=author&query=Muchnoi%2C+N+Y">N. Yu. Muchnoi</a>, <a href="/search/nucl-ex?searchtype=author&query=Neufeld%2C+V+V">V. V. Neufeld</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikolenko%2C+D+M">D. M. Nikolenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Sadykov%2C+R+S">R. Sh. Sadykov</a>, <a href="/search/nucl-ex?searchtype=author&query=Shestakov%2C+Y+V">Yu. V. Shestakov</a>, <a href="/search/nucl-ex?searchtype=author&query=Stibunov%2C+V+N">V. N. Stibunov</a>, <a href="/search/nucl-ex?searchtype=author&query=Toporkov%2C+D+K">D. K. Toporkov</a>, <a href="/search/nucl-ex?searchtype=author&query=de+Vries%2C+H">H. de Vries</a>, <a href="/search/nucl-ex?searchtype=author&query=Zevakov%2C+S+A">S. A. Zevakov</a>, <a href="/search/nucl-ex?searchtype=author&query=Zhilich%2C+V+N">V. N. Zhilich</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="1411.7372v2-abstract-short" style="display: inline;"> The ratio of the elastic $e^+ p$ to $e^- p$ scattering cross sections has been measured precisely, allowing the determination of the two-photon exchange contribution to these processes. This neglected contribution is believed to be the cause of the discrepancy between the Rosenbluth and polarization transfer methods of measuring the proton electromagnetic form factors. The experiment was performed… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1411.7372v2-abstract-full').style.display = 'inline'; document.getElementById('1411.7372v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1411.7372v2-abstract-full" style="display: none;"> The ratio of the elastic $e^+ p$ to $e^- p$ scattering cross sections has been measured precisely, allowing the determination of the two-photon exchange contribution to these processes. This neglected contribution is believed to be the cause of the discrepancy between the Rosenbluth and polarization transfer methods of measuring the proton electromagnetic form factors. The experiment was performed at the VEPP-3 storage ring at beam energies of 1.6 and 1.0 GeV and at lepton scattering angles between $15^\circ$ and $105^\circ$. The data obtained show evidence of a significant two-photon exchange effect. The results are compared with several theoretical predictions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1411.7372v2-abstract-full').style.display = 'none'; document.getElementById('1411.7372v2-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, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 November, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2014. </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, 3 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 114, 062005 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1411.3200">arXiv:1411.3200</a> <span> [<a href="https://arxiv.org/pdf/1411.3200">pdf</a>, <a href="https://arxiv.org/ps/1411.3200">ps</a>, <a href="https://arxiv.org/format/1411.3200">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.91.045506">10.1103/PhysRevC.91.045506 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of Parity-Violating Asymmetry in Electron-Deuteron Inelastic Scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Wang%2C+D">D. Wang</a>, <a href="/search/nucl-ex?searchtype=author&query=Pan%2C+K">K. Pan</a>, <a href="/search/nucl-ex?searchtype=author&query=Subedi%2C+R">R. Subedi</a>, <a href="/search/nucl-ex?searchtype=author&query=Ahmed%2C+Z">Z. Ahmed</a>, <a href="/search/nucl-ex?searchtype=author&query=Allada%2C+K">K. Allada</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=Arrington%2C+J">J. Arrington</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=Benesch%2C+J">J. Benesch</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertozzi%2C+W">W. Bertozzi</a>, <a href="/search/nucl-ex?searchtype=author&query=Camsonne%2C+A">A. Camsonne</a>, <a href="/search/nucl-ex?searchtype=author&query=Canan%2C+M">M. Canan</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=Chen%2C+J+-">J. -P. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chudakov%2C+E">E. Chudakov</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=de+Jager%2C+C+W">C. W. de Jager</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=Deconinck%2C+W">W. Deconinck</a>, <a href="/search/nucl-ex?searchtype=author&query=Deng%2C+X">X. Deng</a>, <a href="/search/nucl-ex?searchtype=author&query=Deur%2C+A">A. Deur</a> , et al. (76 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="1411.3200v1-abstract-short" style="display: inline;"> The parity-violating asymmetries between a longitudinally-polarized electron beam and an unpolarized deuterium target have been measured recently. The measurement covered two kinematic points in the deep inelastic scattering region and five in the nucleon resonance region. We provide here details of the experimental setup, data analysis, and results on all asymmetry measurements including parity-v… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1411.3200v1-abstract-full').style.display = 'inline'; document.getElementById('1411.3200v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1411.3200v1-abstract-full" style="display: none;"> The parity-violating asymmetries between a longitudinally-polarized electron beam and an unpolarized deuterium target have been measured recently. The measurement covered two kinematic points in the deep inelastic scattering region and five in the nucleon resonance region. We provide here details of the experimental setup, data analysis, and results on all asymmetry measurements including parity-violating electron asymmetries and those of inclusive pion production and beam-normal asymmetries. The parity-violating deep-inelastic asymmetries were used to extract the electron-quark weak effective couplings, and the resonance asymmetries provided the first evidence for quark-hadron duality in electroweak observables. These electron asymmetries and their interpretation were published earlier, but are presented here in more detail. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1411.3200v1-abstract-full').style.display = 'none'; document.getElementById('1411.3200v1-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 November, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2014. </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">50 pages, submitted to Phys. Rev. C</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1404.3985">arXiv:1404.3985</a> <span> [<a href="https://arxiv.org/pdf/1404.3985">pdf</a>, <a href="https://arxiv.org/ps/1404.3985">ps</a>, <a href="https://arxiv.org/format/1404.3985">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.112.182501">10.1103/PhysRevLett.112.182501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Separated Response Function Ratios in Exclusive, Forward pi^{+/-} Electroproduction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Huber%2C+G+M">G. M. Huber</a>, <a href="/search/nucl-ex?searchtype=author&query=Blok%2C+H+P">H. P. Blok</a>, <a href="/search/nucl-ex?searchtype=author&query=Butuceanu%2C+C">C. Butuceanu</a>, <a href="/search/nucl-ex?searchtype=author&query=Gaskell%2C+D">D. Gaskell</a>, <a href="/search/nucl-ex?searchtype=author&query=Horn%2C+T">T. Horn</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=Abbott%2C+D">D. Abbott</a>, <a href="/search/nucl-ex?searchtype=author&query=Aniol%2C+K">K. Aniol</a>, <a href="/search/nucl-ex?searchtype=author&query=Anklin%2C+H">H. Anklin</a>, <a href="/search/nucl-ex?searchtype=author&query=Armstrong%2C+C">C. Armstrong</a>, <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Assamagan%2C+K">K. Assamagan</a>, <a href="/search/nucl-ex?searchtype=author&query=Avery%2C+S">S. Avery</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=Barrett%2C+B">B. Barrett</a>, <a href="/search/nucl-ex?searchtype=author&query=Beise%2C+E+J">E. J. Beise</a>, <a href="/search/nucl-ex?searchtype=author&query=Bochna%2C+C">C. Bochna</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W">W. Boeglin</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=Breuer%2C+H">H. Breuer</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=Chant%2C+N">N. Chant</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=Dunne%2C+J">J. Dunne</a>, <a href="/search/nucl-ex?searchtype=author&query=Eden%2C+T">T. Eden</a> , et al. (63 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="1404.3985v1-abstract-short" style="display: inline;"> The study of exclusive $蟺^{\pm}$ electroproduction on the nucleon, including separation of the various structure functions, is of interest for a number of reasons. The ratio $R_L=蟽_L^{蟺^-}/蟽_L^{蟺^+}$ is sensitive to isoscalar contamination to the dominant isovector pion exchange amplitude, which is the basis for the determination of the charged pion form factor from electroproduction data. A chang… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1404.3985v1-abstract-full').style.display = 'inline'; document.getElementById('1404.3985v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1404.3985v1-abstract-full" style="display: none;"> The study of exclusive $蟺^{\pm}$ electroproduction on the nucleon, including separation of the various structure functions, is of interest for a number of reasons. The ratio $R_L=蟽_L^{蟺^-}/蟽_L^{蟺^+}$ is sensitive to isoscalar contamination to the dominant isovector pion exchange amplitude, which is the basis for the determination of the charged pion form factor from electroproduction data. A change in the value of $R_T=蟽_T^{蟺^-}/蟽_T^{蟺^+}$ from unity at small $-t$, to 1/4 at large $-t$, would suggest a transition from coupling to a (virtual) pion to coupling to individual quarks. Furthermore, the mentioned ratios may show an earlier approach to pQCD than the individual cross sections. We have performed the first complete separation of the four unpolarized electromagnetic structure functions above the dominant resonances in forward, exclusive $蟺^{\pm}$ electroproduction on the deuteron at central $Q^2$ values of 0.6, 1.0, 1.6 GeV$^2$ at $W$=1.95 GeV, and $Q^2=2.45$ GeV$^2$ at $W$=2.22 GeV. Here, we present the $L$ and $T$ cross sections, with emphasis on $R_L$ and $R_T$, and compare them with theoretical calculations. Results for the separated ratio $R_L$ indicate dominance of the pion-pole diagram at low $-t$, while results for $R_T$ are consistent with a transition between pion knockout and quark knockout mechanisms. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1404.3985v1-abstract-full').style.display = 'none'; document.getElementById('1404.3985v1-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 April, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2014. </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">Journal ref:</span> Physical Review Letters 112, 182501 (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1311.1527">arXiv:1311.1527</a> <span> [<a href="https://arxiv.org/pdf/1311.1527">pdf</a>, <a href="https://arxiv.org/ps/1311.1527">ps</a>, <a href="https://arxiv.org/format/1311.1527">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"> Large x physics: recent results and future plans </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Holt%2C+R+J">Roy J. Holt</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="1311.1527v1-abstract-short" style="display: inline;"> The valence region is exceedingly important in hadron physics since this region not only defines a hadron but also is an excellent discriminator of nucleon structure models. Present uncertainties in light quark distribution functions at high x could also impact high energy physics. Here we will describe a new generation of experiments at Jefferson Lab that is aimed at the high x region of the nucl… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1311.1527v1-abstract-full').style.display = 'inline'; document.getElementById('1311.1527v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1311.1527v1-abstract-full" style="display: none;"> The valence region is exceedingly important in hadron physics since this region not only defines a hadron but also is an excellent discriminator of nucleon structure models. Present uncertainties in light quark distribution functions at high x could also impact high energy physics. Here we will describe a new generation of experiments at Jefferson Lab that is aimed at the high x region of the nucleon. It is noted that the proposed Electron Ion Collider could explore the high x regime. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1311.1527v1-abstract-full').style.display = 'none'; document.getElementById('1311.1527v1-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 November, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2013. </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, 3 figures, International Symposium on Multiparticle Dynamics, 2013</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1308.1236">arXiv:1308.1236</a> <span> [<a href="https://arxiv.org/pdf/1308.1236">pdf</a>, <a href="https://arxiv.org/ps/1308.1236">ps</a>, <a href="https://arxiv.org/format/1308.1236">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 - Lattice">hep-lat</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.2013.09.038">10.1016/j.physletb.2013.09.038 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nucleon spin structure at very high-x </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Roberts%2C+C+D">Craig D. Roberts</a>, <a href="/search/nucl-ex?searchtype=author&query=Holt%2C+R+J">Roy J. Holt</a>, <a href="/search/nucl-ex?searchtype=author&query=Schmidt%2C+S+M">Sebastian M. Schmidt</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="1308.1236v3-abstract-short" style="display: inline;"> Dyson-Schwinger equation treatments of the strong interaction show that the presence and importance of nonpointlike diquark correlations within the nucleon are a natural consequence of dynamical chiral symmetry breaking. Using this foundation, we deduce a collection of simple formulae, expressed in terms of diquark appearance and mixing probabilities, from which one may compute ratios of longitudi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1308.1236v3-abstract-full').style.display = 'inline'; document.getElementById('1308.1236v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1308.1236v3-abstract-full" style="display: none;"> Dyson-Schwinger equation treatments of the strong interaction show that the presence and importance of nonpointlike diquark correlations within the nucleon are a natural consequence of dynamical chiral symmetry breaking. Using this foundation, we deduce a collection of simple formulae, expressed in terms of diquark appearance and mixing probabilities, from which one may compute ratios of longitudinal-spin-dependent u- and d-quark parton distribution functions on the domain x =1. A comparison with predictions from other approaches plus a consideration of extant and planned experiments shows that the measurement of nucleon longitudinal spin asymmetries on x =1 can add considerably to our capacity for discriminating between contemporary pictures of nucleon structure. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1308.1236v3-abstract-full').style.display = 'none'; document.getElementById('1308.1236v3-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 September, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 August, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2013. </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, 1 table, 3 figures. To appear in Phys. Lett. B</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1306.6000">arXiv:1306.6000</a> <span> [<a href="https://arxiv.org/pdf/1306.6000">pdf</a>, <a href="https://arxiv.org/ps/1306.6000">ps</a>, <a href="https://arxiv.org/format/1306.6000">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.2013.06.090">10.1016/j.nima.2013.06.090 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Thermomechanical design of a static gas target for electron accelerators </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Brajuskovic%2C+B">B. Brajuskovic</a>, <a href="/search/nucl-ex?searchtype=author&query=O%27Connor%2C+T">T. O'Connor</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=Reneker%2C+J">J. Reneker</a>, <a href="/search/nucl-ex?searchtype=author&query=Meekin%2C+D">D. Meekin</a>, <a href="/search/nucl-ex?searchtype=author&query=Solvignon%2C+P">P. Solvignon</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="1306.6000v1-abstract-short" style="display: inline;"> Gas targets are often used at accelerator facilities. A design of high-pressure gas cells that are suitable for hydrogen and helium isotopes at relatively high electron beam currents is presented. In particular, we consider rare gas targets, $^3$H$_2$ and $^3$He. In the design, heat transfer and mechanical integrity of the target cell are emphasized. ANSYS 12 was used for the thermo-mechanical stu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1306.6000v1-abstract-full').style.display = 'inline'; document.getElementById('1306.6000v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1306.6000v1-abstract-full" style="display: none;"> Gas targets are often used at accelerator facilities. A design of high-pressure gas cells that are suitable for hydrogen and helium isotopes at relatively high electron beam currents is presented. In particular, we consider rare gas targets, $^3$H$_2$ and $^3$He. In the design, heat transfer and mechanical integrity of the target cell are emphasized. ANSYS 12 was used for the thermo-mechanical studies of the target cell. Since the ultimate goal in this study was to design a gas target for use at the Jefferson Laboratory (JLab), particular attention is given to the typical operating conditions found there. It is demonstrated that an aluminum alloy cell can meet the required design goals. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1306.6000v1-abstract-full').style.display = 'none'; document.getElementById('1306.6000v1-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 June, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2013. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1304.7741">arXiv:1304.7741</a> <span> [<a href="https://arxiv.org/pdf/1304.7741">pdf</a>, <a href="https://arxiv.org/ps/1304.7741">ps</a>, <a href="https://arxiv.org/format/1304.7741">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.111.082501">10.1103/PhysRevLett.111.082501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the Parity-Violating Asymmetry in Electron-Deuteron Scattering in the Nucleon Resonance Region </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Wang%2C+D">D. Wang</a>, <a href="/search/nucl-ex?searchtype=author&query=Pan%2C+K">K. Pan</a>, <a href="/search/nucl-ex?searchtype=author&query=Subedi%2C+R">R. Subedi</a>, <a href="/search/nucl-ex?searchtype=author&query=Deng%2C+X">X. Deng</a>, <a href="/search/nucl-ex?searchtype=author&query=Ahmed%2C+Z">Z. Ahmed</a>, <a href="/search/nucl-ex?searchtype=author&query=Allada%2C+K">K. Allada</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=Arrington%2C+J">J. Arrington</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=Benesch%2C+J">J. Benesch</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=Canan%2C+M">M. Canan</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=Chen%2C+J+-">J. -P. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chudakov%2C+E">E. Chudakov</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=de+Jager%2C+C+W">C. W. de Jager</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=Deconinck%2C+W">W. Deconinck</a>, <a href="/search/nucl-ex?searchtype=author&query=Deur%2C+A">A. Deur</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutta%2C+C">C. Dutta</a> , et al. (73 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="1304.7741v2-abstract-short" style="display: inline;"> We report on parity-violating asymmetries in the nucleon resonance region measured using $5 - 6$ GeV longitudinally polarized electrons scattering off an unpolarized deuterium target. These results are the first parity-violating asymmetry data in the resonance region beyond the $螖(1232)$, and provide a verification of quark-hadron duality in the nucleon electroweak $纬Z$ interference structure func… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1304.7741v2-abstract-full').style.display = 'inline'; document.getElementById('1304.7741v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1304.7741v2-abstract-full" style="display: none;"> We report on parity-violating asymmetries in the nucleon resonance region measured using $5 - 6$ GeV longitudinally polarized electrons scattering off an unpolarized deuterium target. These results are the first parity-violating asymmetry data in the resonance region beyond the $螖(1232)$, and provide a verification of quark-hadron duality in the nucleon electroweak $纬Z$ interference structure functions at the (10-15)% level. The results are of particular interest to models relevant for calculating the $纬Z$ box-diagram corrections to elastic parity-violating electron scattering measurements. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1304.7741v2-abstract-full').style.display = 'none'; document.getElementById('1304.7741v2-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 August, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 April, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2013. </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, 1 figure, to appear in Phys. Rev. Lett</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 111, 082501 (2013) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1212.6819">arXiv:1212.6819</a> <span> [<a href="https://arxiv.org/pdf/1212.6819">pdf</a>, <a href="https://arxiv.org/ps/1212.6819">ps</a>, <a href="https://arxiv.org/format/1212.6819">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 Methods for Astrophysics">astro-ph.IM</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.2012.12.068">10.1016/j.physletb.2012.12.068 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First determination of an astrophysical cross section with a bubble chamber: the 15N(伪,纬)19F reaction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Ugalde%2C+C">C. Ugalde</a>, <a href="/search/nucl-ex?searchtype=author&query=DiGiovine%2C+B">B. DiGiovine</a>, <a href="/search/nucl-ex?searchtype=author&query=Henderson%2C+D">D. Henderson</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=Rehm%2C+K+E">K. E. Rehm</a>, <a href="/search/nucl-ex?searchtype=author&query=Sonnenschein%2C+A">A. Sonnenschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Robinson%2C+A">A. Robinson</a>, <a href="/search/nucl-ex?searchtype=author&query=Raut%2C+R">R. Raut</a>, <a href="/search/nucl-ex?searchtype=author&query=Rusev%2C+G">G. Rusev</a>, <a href="/search/nucl-ex?searchtype=author&query=Tonchev%2C+A+P">A. P. Tonchev</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="1212.6819v1-abstract-short" style="display: inline;"> We have devised a technique for measuring some of the most important nuclear reactions in stars which we expect to provide considerable improvement over previous experiments. Adapting ideas from dark matter search experiments with bubble chambers, we have found that a superheated liquid is sensitive to recoils produced from 纬-rays photodisintegrating the nuclei of the liquid. The main advantage of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1212.6819v1-abstract-full').style.display = 'inline'; document.getElementById('1212.6819v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1212.6819v1-abstract-full" style="display: none;"> We have devised a technique for measuring some of the most important nuclear reactions in stars which we expect to provide considerable improvement over previous experiments. Adapting ideas from dark matter search experiments with bubble chambers, we have found that a superheated liquid is sensitive to recoils produced from 纬-rays photodisintegrating the nuclei of the liquid. The main advantage of the new target-detector system is a gain in yield of six orders of magnitude over conventional gas targets due to the higher mass density of liquids. Also, the detector is practically insensitive to the 纬-ray beam itself, thus allowing it to detect only the products of the nuclear reaction of interest. The first set of tests of a superheated target with a narrow bandwidth 纬-ray beam was completed and the results demonstrate the feasibility of the scheme. The new data are successfully described by an R-matrix model using published resonance parameters. With the increase in luminosity of the next generation 纬-ray beam facilities, the measurement of thermonuclear rates in the stellar Gamow window would become possible. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1212.6819v1-abstract-full').style.display = 'none'; document.getElementById('1212.6819v1-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 December, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2012. </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 Phys Lett B</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1201.2735">arXiv:1201.2735</a> <span> [<a href="https://arxiv.org/pdf/1201.2735">pdf</a>, <a href="https://arxiv.org/ps/1201.2735">ps</a>, <a href="https://arxiv.org/format/1201.2735">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2012.05.019">10.1016/j.physletb.2012.05.019 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Evidence for the Onset of Color Transparency in $蟻^0$ Electroproduction off Nuclei </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Fassi%2C+L+E">L. El Fassi</a>, <a href="/search/nucl-ex?searchtype=author&query=Zana%2C+L">L. Zana</a>, <a href="/search/nucl-ex?searchtype=author&query=Hafidi%2C+K">K. Hafidi</a>, <a href="/search/nucl-ex?searchtype=author&query=Holtrop%2C+M">M. Holtrop</a>, <a href="/search/nucl-ex?searchtype=author&query=Mustapha%2C+B">B. Mustapha</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Hakobyan%2C+H">H. Hakobyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Zheng%2C+X">X. Zheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adikaram%2C+D">D. Adikaram</a>, <a href="/search/nucl-ex?searchtype=author&query=Aghasyan%2C+M">M. Aghasyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M+J">M. J. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Anghinolfi%2C+M">M. Anghinolfi</a>, <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Baghdasaryan%2C+H">H. Baghdasaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Batourine%2C+V">V. Batourine</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Bookwalter%2C+C">C. Bookwalter</a>, <a href="/search/nucl-ex?searchtype=author&query=Branford%2C+D">D. Branford</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=Bultmann%2C+S">S. Bultmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V+D">V. D. Burkert</a> , et al. (132 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1201.2735v4-abstract-short" style="display: inline;"> We have measured the nuclear transparency of the incoherent diffractive $A(e,e'蟻^0)$ process in $^{12}$C and $^{56}$Fe targets relative to $^2$H using a 5 GeV electron beam. The nuclear transparency, the ratio of the produced $蟻^0$'s on a nucleus relative to deuterium, which is sensitive to $蟻A$ interaction, was studied as function of the coherence length ($l_c$), a lifetime of the hadronic fluctu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1201.2735v4-abstract-full').style.display = 'inline'; document.getElementById('1201.2735v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1201.2735v4-abstract-full" style="display: none;"> We have measured the nuclear transparency of the incoherent diffractive $A(e,e'蟻^0)$ process in $^{12}$C and $^{56}$Fe targets relative to $^2$H using a 5 GeV electron beam. The nuclear transparency, the ratio of the produced $蟻^0$'s on a nucleus relative to deuterium, which is sensitive to $蟻A$ interaction, was studied as function of the coherence length ($l_c$), a lifetime of the hadronic fluctuation of the virtual photon, and the four-momentum transfer squared ($Q^2$). While the transparency for both $^{12}$C and $^{56}$Fe showed no $l_c$ dependence, a significant $Q^2$ dependence was measured, which is consistent with calculations that included the color transparency effects. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1201.2735v4-abstract-full').style.display = 'none'; document.getElementById('1201.2735v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 May, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 January, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2012. </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 and 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/1112.5369">arXiv:1112.5369</a> <span> [<a href="https://arxiv.org/pdf/1112.5369">pdf</a>, <a href="https://arxiv.org/format/1112.5369">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/10.1016/j.nuclphysbps.2012.02.045">10.1016/j.nuclphysbps.2012.02.045 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the two-photon exchange contribution in elastic $ep$ scattering at VEPP-3 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Gramolin%2C+A+V">A. V. Gramolin</a>, <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Barkov%2C+L+M">L. M. Barkov</a>, <a href="/search/nucl-ex?searchtype=author&query=Dmitriev%2C+V+F">V. F. Dmitriev</a>, <a href="/search/nucl-ex?searchtype=author&query=Gauzshtein%2C+V+V">V. V. Gauzshtein</a>, <a href="/search/nucl-ex?searchtype=author&query=Golovin%2C+R+A">R. A. Golovin</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=Kaminsky%2C+V+V">V. V. Kaminsky</a>, <a href="/search/nucl-ex?searchtype=author&query=Lazarenko%2C+B+A">B. A. Lazarenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Mishnev%2C+S+I">S. I. Mishnev</a>, <a href="/search/nucl-ex?searchtype=author&query=Muchnoi%2C+N+Y">N. Yu. Muchnoi</a>, <a href="/search/nucl-ex?searchtype=author&query=Neufeld%2C+V+V">V. V. Neufeld</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikolenko%2C+D+M">D. M. Nikolenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Rachek%2C+I+A">I. A. Rachek</a>, <a href="/search/nucl-ex?searchtype=author&query=Sadykov%2C+R+S">R. Sh. Sadykov</a>, <a href="/search/nucl-ex?searchtype=author&query=Shestakov%2C+Y+V">Yu. V. Shestakov</a>, <a href="/search/nucl-ex?searchtype=author&query=Stibunov%2C+V+N">V. N. Stibunov</a>, <a href="/search/nucl-ex?searchtype=author&query=Toporkov%2C+D+K">D. K. Toporkov</a>, <a href="/search/nucl-ex?searchtype=author&query=de+Vries%2C+H">H. de Vries</a>, <a href="/search/nucl-ex?searchtype=author&query=Zevakov%2C+S+A">S. A. Zevakov</a>, <a href="/search/nucl-ex?searchtype=author&query=Zhilich%2C+V+N">V. N. Zhilich</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="1112.5369v1-abstract-short" style="display: inline;"> We report on the status of the Novosibirsk experiment on a precision measurement of the ratio $R$ of the elastic $e^+ p$ and $e^- p$ scattering cross sections. Such measurements determine the two-photon exchange effect in elastic electron-proton scattering. The experiment is conducted at the VEPP-3 storage ring using a hydrogen internal gas target. The ratio $R$ is measured with a beam energy of 1… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1112.5369v1-abstract-full').style.display = 'inline'; document.getElementById('1112.5369v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1112.5369v1-abstract-full" style="display: none;"> We report on the status of the Novosibirsk experiment on a precision measurement of the ratio $R$ of the elastic $e^+ p$ and $e^- p$ scattering cross sections. Such measurements determine the two-photon exchange effect in elastic electron-proton scattering. The experiment is conducted at the VEPP-3 storage ring using a hydrogen internal gas target. The ratio $R$ is measured with a beam energy of 1.6 GeV (electron/positron scattering angles are $胃= 55 梅75^{\circ}$ and $胃= 15 梅25^{\circ}$) and 1 GeV ($胃= 65 梅105^{\circ}$). We briefly describe the experimental method, paying special attention to the radiative corrections. Some preliminary results are presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1112.5369v1-abstract-full').style.display = 'none'; document.getElementById('1112.5369v1-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> 22 December, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2011. </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, 6 figures and 1 table; contribution to the Proceedings of the PHIPSI11 Workshop (Novosibirsk, Russia, 19-22 September 2011)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl. Phys. B (Proc. Suppl.) 225-227 (2012) 216 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1107.3583">arXiv:1107.3583</a> <span> [<a href="https://arxiv.org/pdf/1107.3583">pdf</a>, <a href="https://arxiv.org/ps/1107.3583">ps</a>, <a href="https://arxiv.org/format/1107.3583">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.108.092502">10.1103/PhysRevLett.108.092502 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> New measurements of high-momentum nucleons and short-range structures in nuclei </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Fomin%2C+N">N. Fomin</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+R">R. Asaturyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W">W. Boeglin</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosted%2C+P">P. Bosted</a>, <a href="/search/nucl-ex?searchtype=author&query=Bruell%2C+A">A. Bruell</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=Chudakov%2C+E">E. Chudakov</a>, <a href="/search/nucl-ex?searchtype=author&query=Clasie%2C+B">B. Clasie</a>, <a href="/search/nucl-ex?searchtype=author&query=Connell%2C+S+H">S. H. Connell</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>, <a href="/search/nucl-ex?searchtype=author&query=Day%2C+D+B">D. B. Day</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=Fassi%2C+L+E">L. El Fassi</a>, <a href="/search/nucl-ex?searchtype=author&query=Fenker%2C+H">H. Fenker</a>, <a href="/search/nucl-ex?searchtype=author&query=Filippone%2C+B+W">B. W. Filippone</a>, <a href="/search/nucl-ex?searchtype=author&query=Garrow%2C+K">K. Garrow</a>, <a href="/search/nucl-ex?searchtype=author&query=Gaskell%2C+D">D. Gaskell</a>, <a href="/search/nucl-ex?searchtype=author&query=Hill%2C+C">C. Hill</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=Horn%2C+T">T. Horn</a>, <a href="/search/nucl-ex?searchtype=author&query=Jones%2C+M+K">M. K. Jones</a> , et al. (41 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="1107.3583v2-abstract-short" style="display: inline;"> We present new measurements of electron scattering from high-momentum nucleons in nuclei. These data allow an improved determination of the strength of two-nucleon correlations for several nuclei, including light nuclei where clustering effects can, for the first time, be examined. The data also include the kinematic region where three-nucleon correlations are expected to dominate. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1107.3583v2-abstract-full" style="display: none;"> We present new measurements of electron scattering from high-momentum nucleons in nuclei. These data allow an improved determination of the strength of two-nucleon correlations for several nuclei, including light nuclei where clustering effects can, for the first time, be examined. The data also include the kinematic region where three-nucleon correlations are expected to dominate. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.3583v2-abstract-full').style.display = 'none'; document.getElementById('1107.3583v2-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, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 July, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2011. </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, 3 figures. Results from JLab E02-019</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1103.1649">arXiv:1103.1649</a> <span> [<a href="https://arxiv.org/pdf/1103.1649">pdf</a>, <a href="https://arxiv.org/ps/1103.1649">ps</a>, <a href="https://arxiv.org/format/1103.1649">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.85.015202">10.1103/PhysRevC.85.015202 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Semi-Inclusive Charged-Pion Electroproduction off Protons and Deuterons: Cross Sections, Ratios and Access to the Quark-Parton Model at Low Energies </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Asaturyan%2C+R">R. Asaturyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Ent%2C+R">R. Ent</a>, <a href="/search/nucl-ex?searchtype=author&query=Mkrtchyan%2C+H">H. Mkrtchyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Navasardyan%2C+T">T. Navasardyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Tadevosyan%2C+V">V. Tadevosyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Adams%2C+G+S">G. S. Adams</a>, <a href="/search/nucl-ex?searchtype=author&query=Ahmidouch%2C+A">A. Ahmidouch</a>, <a href="/search/nucl-ex?searchtype=author&query=Angelescu%2C+T">T. Angelescu</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=Baker%2C+O+K">O. K. Baker</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmouna%2C+N">N. Benmouna</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertoncini%2C+C">C. Bertoncini</a>, <a href="/search/nucl-ex?searchtype=author&query=Blok%2C+H+P">H. P. Blok</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W+U">W. U. Boeglin</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosted%2C+P+E">P. E. Bosted</a>, <a href="/search/nucl-ex?searchtype=author&query=Breuer%2C+H">H. Breuer</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=Connell%2C+S+H">S. H. Connell</a>, <a href="/search/nucl-ex?searchtype=author&query=Cui%2C+Y">Y. Cui</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=Danagoulian%2C+S">S. Danagoulian</a>, <a href="/search/nucl-ex?searchtype=author&query=Day%2C+D">D. Day</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunne%2C+J+A">J. A. Dunne</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutta%2C+D">D. Dutta</a> , et al. (55 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="1103.1649v3-abstract-short" style="display: inline;"> A large set of cross sections for semi-inclusive electroproduction of charged pions ($蟺^\pm$) from both proton and deuteron targets was measured. The data are in the deep-inelastic scattering region with invariant mass squared $W^2$ > 4 GeV$^2$ and range in four-momentum transfer squared $2 < Q^2 < 4$ (GeV/c)$^2$, and cover a range in the Bjorken scaling variable 0.2 < x < 0.6. The fractional ener… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1103.1649v3-abstract-full').style.display = 'inline'; document.getElementById('1103.1649v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1103.1649v3-abstract-full" style="display: none;"> A large set of cross sections for semi-inclusive electroproduction of charged pions ($蟺^\pm$) from both proton and deuteron targets was measured. The data are in the deep-inelastic scattering region with invariant mass squared $W^2$ > 4 GeV$^2$ and range in four-momentum transfer squared $2 < Q^2 < 4$ (GeV/c)$^2$, and cover a range in the Bjorken scaling variable 0.2 < x < 0.6. The fractional energy of the pions spans a range 0.3 < z < 1, with small transverse momenta with respect to the virtual-photon direction, $P_t^2 < 0.2$ (GeV/c)$^2$. The invariant mass that goes undetected, $M_x$ or W', is in the nucleon resonance region, W' < 2 GeV. The new data conclusively show the onset of quark-hadron duality in this process, and the relation of this phenomenon to the high-energy factorization ansatz of electron-quark scattering and subsequent quark --> pion production mechanisms. The x, z and $P_t^2$ dependences of several ratios (the ratios of favored-unfavored fragmentation functions, charged pion ratios, deuteron-hydrogen and aluminum-deuteron ratios for $蟺^+$ and $蟺^-$) have been studied. The ratios are found to be in good agreement with expectations based upon a high-energy quark-parton model description. We find the azimuthal dependences to be small, as compared to exclusive pion electroproduction, and consistent with theoretical expectations based on tree-level factorization in terms of transverse-momentum-dependent parton distribution and fragmentation functions. In the context of a simple model, the initial transverse momenta of $d$ quarks are found to be slightly smaller than for $u$ quarks, while the transverse momentum width of the favored fragmentation function is about the same as for the unfavored one, and both fragmentation widths are larger than the quark widths. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1103.1649v3-abstract-full').style.display = 'none'; document.getElementById('1103.1649v3-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 December, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 March, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2011. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1102.0318">arXiv:1102.0318</a> <span> [<a href="https://arxiv.org/pdf/1102.0318">pdf</a>, <a href="https://arxiv.org/ps/1102.0318">ps</a>, <a href="https://arxiv.org/format/1102.0318">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2011.10.002">10.1016/j.physletb.2011.10.002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High Precision Measurement of the Proton Elastic Form Factor Ratio $渭_pG_E/G_M$ at low $Q^2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Zhan%2C+X">X. Zhan</a>, <a href="/search/nucl-ex?searchtype=author&query=Allada%2C+K">K. Allada</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=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertozzi%2C+W">W. Bertozzi</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W">W. Boeglin</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=Choi%2C+S">S. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Chudakov%2C+E">E. Chudakov</a>, <a href="/search/nucl-ex?searchtype=author&query=Cisbani%2C+E">E. Cisbani</a>, <a href="/search/nucl-ex?searchtype=author&query=Decowski%2C+P">P. Decowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutta%2C+C">C. Dutta</a>, <a href="/search/nucl-ex?searchtype=author&query=Frullani%2C+S">S. Frullani</a>, <a href="/search/nucl-ex?searchtype=author&query=Fuchey%2C+E">E. Fuchey</a>, <a href="/search/nucl-ex?searchtype=author&query=Garibaldi%2C+F">F. Garibaldi</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilad%2C+S">S. Gilad</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilman%2C+R">R. Gilman</a>, <a href="/search/nucl-ex?searchtype=author&query=Glister%2C+J">J. Glister</a>, <a href="/search/nucl-ex?searchtype=author&query=Hafidi%2C+K">K. Hafidi</a>, <a href="/search/nucl-ex?searchtype=author&query=Hahn%2C+B">B. Hahn</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=Holmstrom%2C+T">T. Holmstrom</a>, <a href="/search/nucl-ex?searchtype=author&query=Holt%2C+R+J">R. J. Holt</a> , et al. (46 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="1102.0318v2-abstract-short" style="display: inline;"> We report a new, high-precision measurement of the proton elastic form factor ratio 渭_p G_E/G_M for the four-momentum transfer squared Q^2 = 0.3-0.7 (GeV/c)^2. The measurement was performed at Jefferson Lab (JLab) in Hall A using recoil polarimetry. With a total uncertainty of approximately 1%, the new data clearly show that the deviation of the ratio 渭_p G_E/G_M from unity observed in previous po… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1102.0318v2-abstract-full').style.display = 'inline'; document.getElementById('1102.0318v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1102.0318v2-abstract-full" style="display: none;"> We report a new, high-precision measurement of the proton elastic form factor ratio 渭_p G_E/G_M for the four-momentum transfer squared Q^2 = 0.3-0.7 (GeV/c)^2. The measurement was performed at Jefferson Lab (JLab) in Hall A using recoil polarimetry. With a total uncertainty of approximately 1%, the new data clearly show that the deviation of the ratio 渭_p G_E/G_M from unity observed in previous polarization measurements at high Q^2 continues down to the lowest Q^2 value of this measurement. The updated global fit that includes the new results yields an electric (magnetic) form factor roughly 2% smaller (1% larger) than the previous global fit in this Q^2 range. We obtain new extractions of the proton electric and magnetic radii, which are <r^2_E>^(1/2)=0.875+/-0.010 fm and <r^2_M>^(1/2)=0.867+/-0.020 fm. The charge radius is consistent with other recent extractions based on the electron-proton interaction, including the atomic hydrogen Lamb shift measurements, which suggests a missing correction in the comparison of measurements of the proton charge radius using electron probes and the recent extraction from the muonic hydrogen Lamb shift. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1102.0318v2-abstract-full').style.display = 'none'; document.getElementById('1102.0318v2-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> 31 August, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 February, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Lett. B 705 (2011) 59-64 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1008.2713">arXiv:1008.2713</a> <span> [<a href="https://arxiv.org/pdf/1008.2713">pdf</a>, <a href="https://arxiv.org/ps/1008.2713">ps</a>, <a href="https://arxiv.org/format/1008.2713">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.105.212502">10.1103/PhysRevLett.105.212502 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Scaling of the F_2 structure function in nuclei and quark distributions at x>1 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Fomin%2C+N">N. Fomin</a>, <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Day%2C+D+B">D. B. Day</a>, <a href="/search/nucl-ex?searchtype=author&query=Gaskell%2C+D">D. Gaskell</a>, <a href="/search/nucl-ex?searchtype=author&query=Daniel%2C+A">A. Daniel</a>, <a href="/search/nucl-ex?searchtype=author&query=Seely%2C+J">J. Seely</a>, <a href="/search/nucl-ex?searchtype=author&query=Asaturyan%2C+R">R. Asaturyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W">W. Boeglin</a>, <a href="/search/nucl-ex?searchtype=author&query=Boillat%2C+B">B. Boillat</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosted%2C+P">P. Bosted</a>, <a href="/search/nucl-ex?searchtype=author&query=Bruell%2C+A">A. Bruell</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=Christy%2C+M+E">M. E. Christy</a>, <a href="/search/nucl-ex?searchtype=author&query=Chudakov%2C+E">E. Chudakov</a>, <a href="/search/nucl-ex?searchtype=author&query=Clasie%2C+B">B. Clasie</a>, <a href="/search/nucl-ex?searchtype=author&query=Connell%2C+S+H">S. H. Connell</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=Ent%2C+R">R. Ent</a>, <a href="/search/nucl-ex?searchtype=author&query=Fassi%2C+L+E">L. El Fassi</a>, <a href="/search/nucl-ex?searchtype=author&query=Fenker%2C+H">H. Fenker</a>, <a href="/search/nucl-ex?searchtype=author&query=Filippone%2C+B+W">B. W. Filippone</a>, <a href="/search/nucl-ex?searchtype=author&query=Garrow%2C+K">K. Garrow</a>, <a href="/search/nucl-ex?searchtype=author&query=Hill%2C+C">C. Hill</a> , et al. (45 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="1008.2713v1-abstract-short" style="display: inline;"> We present new data on electron scattering from a range of nuclei taken in Hall C at Jefferson Lab. For heavy nuclei, we observe a rapid falloff in the cross section for $x>1$, which is sensitive to short range contributions to the nuclear wave-function, and in deep inelastic scattering corresponds to probing extremely high momentum quarks. This result agrees with higher energy muon scattering mea… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1008.2713v1-abstract-full').style.display = 'inline'; document.getElementById('1008.2713v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1008.2713v1-abstract-full" style="display: none;"> We present new data on electron scattering from a range of nuclei taken in Hall C at Jefferson Lab. For heavy nuclei, we observe a rapid falloff in the cross section for $x>1$, which is sensitive to short range contributions to the nuclear wave-function, and in deep inelastic scattering corresponds to probing extremely high momentum quarks. This result agrees with higher energy muon scattering measurements, but is in sharp contrast to neutrino scattering measurements which suggested a dramatic enhancement in the distribution of the `super-fast' quarks probed at x>1. The falloff at x>1 is noticeably stronger in ^2H and ^3He, but nearly identical for all heavier nuclei. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1008.2713v1-abstract-full').style.display = 'none'; document.getElementById('1008.2713v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 August, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2010. </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, 4 figures, to be submitted to physical review</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.Lett.105:212502,2010 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1002.4666">arXiv:1002.4666</a> <span> [<a href="https://arxiv.org/pdf/1002.4666">pdf</a>, <a href="https://arxiv.org/ps/1002.4666">ps</a>, <a href="https://arxiv.org/format/1002.4666">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 - Lattice">hep-lat</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/RevModPhys.82.2991">10.1103/RevModPhys.82.2991 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Distribution Functions of the Nucleon and Pion in the Valence Region </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Holt%2C+R+J">Roy J. Holt</a>, <a href="/search/nucl-ex?searchtype=author&query=Roberts%2C+C+D">Craig D. Roberts</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="1002.4666v3-abstract-short" style="display: inline;"> We provide an experimental and theoretical perspective on the behavior of unpolarized distribution functions for the nucleon and pion on the valence-quark domain; namely, Bjorken-x \gtrsim 0.4. This domain is key to much of hadron physics; e.g., a hadron is defined by its flavor content and that is a valence-quark property. Furthermore, its accurate parametrization is crucial to the provision of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1002.4666v3-abstract-full').style.display = 'inline'; document.getElementById('1002.4666v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1002.4666v3-abstract-full" style="display: none;"> We provide an experimental and theoretical perspective on the behavior of unpolarized distribution functions for the nucleon and pion on the valence-quark domain; namely, Bjorken-x \gtrsim 0.4. This domain is key to much of hadron physics; e.g., a hadron is defined by its flavor content and that is a valence-quark property. Furthermore, its accurate parametrization is crucial to the provision of reliable input for large collider experiments. We focus on experimental extractions of distribution functions via electron and muon inelastic scattering, and from Drell-Yan interactions; and on theoretical treatments that emphasize an explanation of the distribution functions, providing an overview of major contemporary approaches and issues. Valence-quark physics is a compelling subject, which probes at the heart of our understanding of the Standard Model. There are numerous outstanding and unresolved challenges, which experiment and theory must confront. In connection with experiment, we explain that an upgraded Jefferson Lab facility is well-suited to provide new data on the nucleon, while a future electron ion collider could provide essential new data for the mesons. There is also great potential in using Drell-Yan interactions, at FNAL, J-PARC and GSI, to push into the large-x domain for both mesons and nucleons. We argue furthermore that explanation, in contrast to modeling and parametrization, requires a widespread acceptance of the need to adapt theory: to the lessons learnt already from the methods of nonperturbative quantum field theory; and a fuller exploitation of those methods. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1002.4666v3-abstract-full').style.display = 'none'; document.getElementById('1002.4666v3-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, 2010; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 February, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2010. </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">Review article: 133 double-spaced pages, 44 figures, 6 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Rev.Mod.Phys.82:2991-3044,2010 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0906.2839">arXiv:0906.2839</a> <span> [<a href="https://arxiv.org/pdf/0906.2839">pdf</a>, <a href="https://arxiv.org/ps/0906.2839">ps</a>, <a href="https://arxiv.org/format/0906.2839">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.80.035203">10.1103/PhysRevC.80.035203 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Neutral Pion Electroproduction in the Resonance Region at High $Q^2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Villano%2C+A+N">A. N. Villano</a>, <a href="/search/nucl-ex?searchtype=author&query=Stoler%2C+P">P. Stoler</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosted%2C+P+E">P. E. Bosted</a>, <a href="/search/nucl-ex?searchtype=author&query=Connell%2C+S+H">S. H. Connell</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=Jones%2C+M+K">M. K. Jones</a>, <a href="/search/nucl-ex?searchtype=author&query=Kubarovsky%2C+V">V. Kubarovsky</a>, <a href="/search/nucl-ex?searchtype=author&query=Adams%2C+G+S">G. S Adams</a>, <a href="/search/nucl-ex?searchtype=author&query=Ahmidouch%2C+A">A. Ahmidouch</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+R">R. Asaturyan</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=Breuer%2C+H">H. Breuer</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=Danagoulian%2C+S">S. Danagoulian</a>, <a href="/search/nucl-ex?searchtype=author&query=Day%2C+D">D. Day</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunne%2C+J+A">J. A. Dunne</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=Fenker%2C+H+C">H. C. Fenker</a>, <a href="/search/nucl-ex?searchtype=author&query=Frolov%2C+V+V">V. V. Frolov</a>, <a href="/search/nucl-ex?searchtype=author&query=Gan%2C+L">L. Gan</a>, <a href="/search/nucl-ex?searchtype=author&query=Gaskell%2C+D">D. Gaskell</a>, <a href="/search/nucl-ex?searchtype=author&query=Hinton%2C+W">W. Hinton</a>, <a href="/search/nucl-ex?searchtype=author&query=Holt%2C+R+J">R. J. Holt</a> , et al. (33 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0906.2839v2-abstract-short" style="display: inline;"> The process $ep \to e^{\prime}p^{\prime}蟺^0$ has been measured at $Q^2$ = 6.4 and 7.7 GeV/c$^2$)$^2$ in Jefferson Lab's Hall C. Unpolarized differential cross sections are reported in the virtual photon-proton center of mass frame considering the process $纬^{\ast}p \to p^{\prime}蟺^0$. Various details relating to the background subtractions, radiative corrections and systematic errors are discuss… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0906.2839v2-abstract-full').style.display = 'inline'; document.getElementById('0906.2839v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0906.2839v2-abstract-full" style="display: none;"> The process $ep \to e^{\prime}p^{\prime}蟺^0$ has been measured at $Q^2$ = 6.4 and 7.7 GeV/c$^2$)$^2$ in Jefferson Lab's Hall C. Unpolarized differential cross sections are reported in the virtual photon-proton center of mass frame considering the process $纬^{\ast}p \to p^{\prime}蟺^0$. Various details relating to the background subtractions, radiative corrections and systematic errors are discussed. The usefulness of the data with regard to the measurement of the electromagnetic properties of the well known $螖(1232)$ resonance is covered in detail. Specifically considered are the electromagnetic and scalar-magnetic ratios $R_{EM}$ and $R_{SM}$ along with the magnetic transition form factor $G_M^{\ast}$. It is found that the rapid fall off of the $螖(1232)$ contribution continues into this region of momentum transfer and that other resonances <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0906.2839v2-abstract-full').style.display = 'none'; document.getElementById('0906.2839v2-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 September, 2009; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 June, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2009. </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">41 pages including numerical cross section tables, updates include new phenomenological fit for multipole extraction in addition to simplified previous method, These fits are seen in figures 24,26 and 27 and the values are reported in Table VIII</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.C80:035203,2009 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0904.4448">arXiv:0904.4448</a> <span> [<a href="https://arxiv.org/pdf/0904.4448">pdf</a>, <a href="https://arxiv.org/ps/0904.4448">ps</a>, <a href="https://arxiv.org/format/0904.4448">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.103.202301">10.1103/PhysRevLett.103.202301 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> New measurements of the EMC effect in very light nuclei </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Seely%2C+J">J. Seely</a>, <a href="/search/nucl-ex?searchtype=author&query=Daniel%2C+A">A. Daniel</a>, <a href="/search/nucl-ex?searchtype=author&query=Gaskell%2C+D">D. Gaskell</a>, <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Fomin%2C+N">N. Fomin</a>, <a href="/search/nucl-ex?searchtype=author&query=Solvignon%2C+P">P. Solvignon</a>, <a href="/search/nucl-ex?searchtype=author&query=Asaturyan%2C+R">R. Asaturyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W">W. Boeglin</a>, <a href="/search/nucl-ex?searchtype=author&query=Boillat%2C+B">B. Boillat</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosted%2C+P">P. Bosted</a>, <a href="/search/nucl-ex?searchtype=author&query=Bruell%2C+A">A. Bruell</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=Christy%2C+M+E">M. E. Christy</a>, <a href="/search/nucl-ex?searchtype=author&query=Clasie%2C+B">B. Clasie</a>, <a href="/search/nucl-ex?searchtype=author&query=Connell%2C+S">S. Connell</a>, <a href="/search/nucl-ex?searchtype=author&query=Dalton%2C+M">M. Dalton</a>, <a href="/search/nucl-ex?searchtype=author&query=Day%2C+D">D. Day</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunne%2C+J">J. Dunne</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutta%2C+D">D. Dutta</a>, <a href="/search/nucl-ex?searchtype=author&query=Fassi%2C+L+E">L. El Fassi</a>, <a href="/search/nucl-ex?searchtype=author&query=Ent%2C+R">R. Ent</a>, <a href="/search/nucl-ex?searchtype=author&query=Fenker%2C+H">H. Fenker</a>, <a href="/search/nucl-ex?searchtype=author&query=Filippone%2C+B+W">B. W. Filippone</a>, <a href="/search/nucl-ex?searchtype=author&query=Gao%2C+H">H. Gao</a> , et al. (46 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="0904.4448v3-abstract-short" style="display: inline;"> New Jefferson Lab data are presented on the nuclear dependence of the inclusive cross section from 2H, 3He, 4He, 9Be and 12C for 0.3<x<0.9, Q^2 approximately 3-6 GeV^2. These data represent the first measurement of the EMC effect for 3He at large x and a significant improvement for 4He. The data do not support previous A-dependent or density-dependent fits to the EMC effect and suggest that the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0904.4448v3-abstract-full').style.display = 'inline'; document.getElementById('0904.4448v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0904.4448v3-abstract-full" style="display: none;"> New Jefferson Lab data are presented on the nuclear dependence of the inclusive cross section from 2H, 3He, 4He, 9Be and 12C for 0.3<x<0.9, Q^2 approximately 3-6 GeV^2. These data represent the first measurement of the EMC effect for 3He at large x and a significant improvement for 4He. The data do not support previous A-dependent or density-dependent fits to the EMC effect and suggest that the nuclear dependence of the quark distributions may depend on the local nuclear environment. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0904.4448v3-abstract-full').style.display = 'none'; document.getElementById('0904.4448v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 October, 2009; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 April, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2009. </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, 4 figures, submitted to PRL. fixed error in author list, minor text revision</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.Lett.103:202301,2009 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0809.3161">arXiv:0809.3161</a> <span> [<a href="https://arxiv.org/pdf/0809.3161">pdf</a>, <a href="https://arxiv.org/ps/0809.3161">ps</a>, <a href="https://arxiv.org/format/0809.3161">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.78.045202">10.1103/PhysRevC.78.045202 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Charged pion form factor between $Q^2$=0.60 and 2.45 GeV$^2$. I. Measurements of the cross section for the ${^1}$H($e,e'蟺^+$)$n$ reaction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Blok%2C+H+P">H. P. Blok</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=Beise%2C+E+J">E. J. Beise</a>, <a href="/search/nucl-ex?searchtype=author&query=Gaskell%2C+D">D. Gaskell</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=Tadevosyan%2C+V">V. Tadevosyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Volmer%2C+J">J. Volmer</a>, <a href="/search/nucl-ex?searchtype=author&query=Abbott%2C+D">D. Abbott</a>, <a href="/search/nucl-ex?searchtype=author&query=Aniol%2C+K">K. Aniol</a>, <a href="/search/nucl-ex?searchtype=author&query=Anklin%2C+H">H. Anklin</a>, <a href="/search/nucl-ex?searchtype=author&query=Armstrong%2C+C">C. Armstrong</a>, <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Assamagan%2C+K">K. Assamagan</a>, <a href="/search/nucl-ex?searchtype=author&query=Avery%2C+S">S. Avery</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=Barrett%2C+B">B. Barrett</a>, <a href="/search/nucl-ex?searchtype=author&query=Bochna%2C+C">C. Bochna</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W">W. Boeglin</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=Breuer%2C+H">H. Breuer</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=Chant%2C+N">N. Chant</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=Dunne%2C+J">J. Dunne</a> , et al. (62 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="0809.3161v1-abstract-short" style="display: inline;"> Cross sections for the reaction ${^1}$H($e,e'蟺^+$)$n$ were measured in Hall C at Thomas Jefferson National Accelerator Facility (JLab) using the CEBAF high-intensity, continous electron beam in order to determine the charged pion form factor. Data were taken for central four-momentum transfers ranging from $Q^2$=0.60 to 2.45 GeV$^2$ at an invariant mass of the virtual photon-nucleon system of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0809.3161v1-abstract-full').style.display = 'inline'; document.getElementById('0809.3161v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0809.3161v1-abstract-full" style="display: none;"> Cross sections for the reaction ${^1}$H($e,e'蟺^+$)$n$ were measured in Hall C at Thomas Jefferson National Accelerator Facility (JLab) using the CEBAF high-intensity, continous electron beam in order to determine the charged pion form factor. Data were taken for central four-momentum transfers ranging from $Q^2$=0.60 to 2.45 GeV$^2$ at an invariant mass of the virtual photon-nucleon system of $W$=1.95 and 2.22 GeV. The measured cross sections were separated into the four structure functions $蟽_L$, $蟽_T$, $蟽_{LT}$, and $蟽_{TT}$. The various parts of the experimental setup and the analysis steps are described in detail, including the calibrations and systematic studies, which were needed to obtain high precision results. The different types of systematic uncertainties are also discussed. The results for the separated cross sections as a function of the Mandelstam variable $t$ at the different values of $Q^2$ are presented. Some global features of the data are discussed, and the data are compared with the results of some model calculations for the reaction ${^1}$H($e,e'蟺^+$)$n$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0809.3161v1-abstract-full').style.display = 'none'; document.getElementById('0809.3161v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 September, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2008. </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">26 pages, 23 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.C78:045202,2008 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0809.3052">arXiv:0809.3052</a> <span> [<a href="https://arxiv.org/pdf/0809.3052">pdf</a>, <a href="https://arxiv.org/ps/0809.3052">ps</a>, <a href="https://arxiv.org/format/0809.3052">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.78.045203">10.1103/PhysRevC.78.045203 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Charged pion form factor between Q^2=0.60 and 2.45 GeV^2. II. Determination of, and results for, the pion form factor </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Huber%2C+G+M">G. M. Huber</a>, <a href="/search/nucl-ex?searchtype=author&query=Blok%2C+H+P">H. P. Blok</a>, <a href="/search/nucl-ex?searchtype=author&query=Horn%2C+T">T. Horn</a>, <a href="/search/nucl-ex?searchtype=author&query=Beise%2C+E+J">E. J. Beise</a>, <a href="/search/nucl-ex?searchtype=author&query=Gaskell%2C+D">D. Gaskell</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=Tadevosyan%2C+V">V. Tadevosyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Volmer%2C+J">J. Volmer</a>, <a href="/search/nucl-ex?searchtype=author&query=Abbott%2C+D">D. Abbott</a>, <a href="/search/nucl-ex?searchtype=author&query=Aniol%2C+K">K. Aniol</a>, <a href="/search/nucl-ex?searchtype=author&query=Anklin%2C+H">H. Anklin</a>, <a href="/search/nucl-ex?searchtype=author&query=Armstrong%2C+C">C. Armstrong</a>, <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Assamagan%2C+K">K. Assamagan</a>, <a href="/search/nucl-ex?searchtype=author&query=Avery%2C+S">S. Avery</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=Barrett%2C+B">B. Barrett</a>, <a href="/search/nucl-ex?searchtype=author&query=Bochna%2C+C">C. Bochna</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W">W. Boeglin</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=Breuer%2C+H">H. Breuer</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=Chant%2C+N">N. Chant</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=Dunne%2C+J">J. Dunne</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="0809.3052v1-abstract-short" style="display: inline;"> The charged pion form factor, Fpi(Q^2), is an important quantity which can be used to advance our knowledge of hadronic structure. However, the extraction of Fpi from data requires a model of the 1H(e,e'pi+)n reaction, and thus is inherently model dependent. Therefore, a detailed description of the extraction of the charged pion form factor from electroproduction data obtained recently at Jeffer… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0809.3052v1-abstract-full').style.display = 'inline'; document.getElementById('0809.3052v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0809.3052v1-abstract-full" style="display: none;"> The charged pion form factor, Fpi(Q^2), is an important quantity which can be used to advance our knowledge of hadronic structure. However, the extraction of Fpi from data requires a model of the 1H(e,e'pi+)n reaction, and thus is inherently model dependent. Therefore, a detailed description of the extraction of the charged pion form factor from electroproduction data obtained recently at Jefferson Lab is presented, with particular focus given to the dominant uncertainties in this procedure. Results for Fpi are presented for Q^2=0.60-2.45 GeV^2. Above Q^2=1.5 GeV^2, the Fpi values are systematically below the monopole parameterization that describes the low Q^2 data used to determine the pion charge radius. The pion form factor can be calculated in a wide variety of theoretical approaches, and the experimental results are compared to a number of calculations. This comparison is helpful in understanding the role of soft versus hard contributions to hadronic structure in the intermediate Q^2 regime. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0809.3052v1-abstract-full').style.display = 'none'; document.getElementById('0809.3052v1-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 September, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2008. </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, 11 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.C78:045203,2008 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0805.3116">arXiv:0805.3116</a> <span> [<a href="https://arxiv.org/pdf/0805.3116">pdf</a>, <a href="https://arxiv.org/ps/0805.3116">ps</a>, <a href="https://arxiv.org/format/0805.3116">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/10.1088/0954-3899/36/2/025005">10.1088/0954-3899/36/2/025005 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Neutron Structure Functions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Coester%2C+F">F. Coester</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=Lee%2C+T+-+H">T. -S. H. Lee</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="0805.3116v2-abstract-short" style="display: inline;"> Neutron structure functions can be extracted from proton and deuteron data and a representation of the deuteron structure. This procedure does not require DIS approximations or quark structure assumptions. We find that the results depend critically on properly accounting for the Q^2 dependence of proton and deuteron data. We interpolate the data to fixed Q^2, and extract the ratio of neutron to… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0805.3116v2-abstract-full').style.display = 'inline'; document.getElementById('0805.3116v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0805.3116v2-abstract-full" style="display: none;"> Neutron structure functions can be extracted from proton and deuteron data and a representation of the deuteron structure. This procedure does not require DIS approximations or quark structure assumptions. We find that the results depend critically on properly accounting for the Q^2 dependence of proton and deuteron data. We interpolate the data to fixed Q^2, and extract the ratio of neutron to proton structure functions. The extracted ratio decreases with increasing x, up to x \approx 0.9, while there are no data available to constrain the behavior at larger x. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0805.3116v2-abstract-full').style.display = 'none'; document.getElementById('0805.3116v2-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 August, 2008; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 May, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2008. </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, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J.Phys.G36:025005,2009 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0801.0601">arXiv:0801.0601</a> <span> [<a href="https://arxiv.org/pdf/0801.0601">pdf</a>, <a href="https://arxiv.org/ps/0801.0601">ps</a>, <a href="https://arxiv.org/format/0801.0601">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.99.252501">10.1103/PhysRevLett.99.252501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nuclear charge radius of $^8$He </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Mueller%2C+P">P. Mueller</a>, <a href="/search/nucl-ex?searchtype=author&query=Sulai%2C+I+A">I. A. Sulai</a>, <a href="/search/nucl-ex?searchtype=author&query=Villari%2C+A+C+C">A. C. C. Villari</a>, <a href="/search/nucl-ex?searchtype=author&query=Alcantara-Nunez%2C+J+A">J. A. Alcantara-Nunez</a>, <a href="/search/nucl-ex?searchtype=author&query=Alves-Conde%2C+R">R. Alves-Conde</a>, <a href="/search/nucl-ex?searchtype=author&query=Bailey%2C+K">K. Bailey</a>, <a href="/search/nucl-ex?searchtype=author&query=Drake%2C+G+W+F">G. W. F. Drake</a>, <a href="/search/nucl-ex?searchtype=author&query=Dubois%2C+M">M. Dubois</a>, <a href="/search/nucl-ex?searchtype=author&query=Eleon%2C+C">C. Eleon</a>, <a href="/search/nucl-ex?searchtype=author&query=Gaubert%2C+G">G. Gaubert</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=Janssens%2C+R+V+F">R. V. F. Janssens</a>, <a href="/search/nucl-ex?searchtype=author&query=Lecesne%2C+N">N. Lecesne</a>, <a href="/search/nucl-ex?searchtype=author&query=Lu%2C+Z+-">Z. -T. Lu</a>, <a href="/search/nucl-ex?searchtype=author&query=O%27Connor%2C+T+P">T. P. O'Connor</a>, <a href="/search/nucl-ex?searchtype=author&query=Saint-Laurent%2C+M+-">M. -G. Saint-Laurent</a>, <a href="/search/nucl-ex?searchtype=author&query=Thomas%2C+J+-">J. -C. Thomas</a>, <a href="/search/nucl-ex?searchtype=author&query=Wang%2C+L+-">L. -B. Wang</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="0801.0601v1-abstract-short" style="display: inline;"> The root-mean-square (rms) nuclear charge radius of ^8He, the most neutron-rich of all particle-stable nuclei, has been determined for the first time to be 1.93(3) fm. In addition, the rms charge radius of ^6He was measured to be 2.068(11) fm, in excellent agreement with a previous result. The significant reduction in charge radius from ^6He to ^8He is an indication of the change in the correlat… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0801.0601v1-abstract-full').style.display = 'inline'; document.getElementById('0801.0601v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0801.0601v1-abstract-full" style="display: none;"> The root-mean-square (rms) nuclear charge radius of ^8He, the most neutron-rich of all particle-stable nuclei, has been determined for the first time to be 1.93(3) fm. In addition, the rms charge radius of ^6He was measured to be 2.068(11) fm, in excellent agreement with a previous result. The significant reduction in charge radius from ^6He to ^8He is an indication of the change in the correlations of the excess neutrons and is consistent with the ^8He neutron halo structure. The experiment was based on laser spectroscopy of individual helium atoms cooled and confined in a magneto-optical trap. Charge radii were extracted from the measured isotope shifts with the help of precision atomic theory calculations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0801.0601v1-abstract-full').style.display = 'none'; document.getElementById('0801.0601v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 January, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.Lett.99:252501,2007 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/nucl-ex/0702002">arXiv:nucl-ex/0702002</a> <span> [<a href="https://arxiv.org/pdf/nucl-ex/0702002">pdf</a>, <a href="https://arxiv.org/ps/nucl-ex/0702002">ps</a>, <a href="https://arxiv.org/format/nucl-ex/0702002">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/PhysRevLett.98.182302">10.1103/PhysRevLett.98.182302 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Angular dependence of recoil proton polarization in high-energy 纬d \to p n </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Jiang%2C+X">X. Jiang</a>, <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</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+J+P">J. P. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+S">S. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Chudakov%2C+E">E. Chudakov</a>, <a href="/search/nucl-ex?searchtype=author&query=Cusanno%2C+F">F. Cusanno</a>, <a href="/search/nucl-ex?searchtype=author&query=Deur%2C+A">A. Deur</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutta%2C+D">D. Dutta</a>, <a href="/search/nucl-ex?searchtype=author&query=Garibaldi%2C+F">F. Garibaldi</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=Glashauser%2C+C">C. Glashauser</a>, <a href="/search/nucl-ex?searchtype=author&query=Hamilton%2C+D">D. Hamilton</a>, <a href="/search/nucl-ex?searchtype=author&query=Hansen%2C+O">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=de+Jager%2C+C+W">C. W. de Jager</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=Kaufman%2C+L+J">L. J. Kaufman</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=Kramer%2C+K">K. Kramer</a>, <a href="/search/nucl-ex?searchtype=author&query=Lagamba%2C+L">L. Lagamba</a> , et al. (30 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="nucl-ex/0702002v1-abstract-short" style="display: inline;"> We measured the angular dependence of the three recoil proton polarization components in two-body photodisintegration of the deuteron at a photon energy of 2 GeV. These new data provide a benchmark for calculations based on quantum chromodynamics. Two of the five existing models have made predictions of polarization observables. Both explain the longitudinal polarization transfer satisfactorily.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0702002v1-abstract-full').style.display = 'inline'; document.getElementById('nucl-ex/0702002v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="nucl-ex/0702002v1-abstract-full" style="display: none;"> We measured the angular dependence of the three recoil proton polarization components in two-body photodisintegration of the deuteron at a photon energy of 2 GeV. These new data provide a benchmark for calculations based on quantum chromodynamics. Two of the five existing models have made predictions of polarization observables. Both explain the longitudinal polarization transfer satisfactorily.. Transverse polarizations are not well described, but suggest isovector dominance. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0702002v1-abstract-full').style.display = 'none'; document.getElementById('nucl-ex/0702002v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 February, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2007. </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, 1 figure, submitted to Physical Review Letters</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.Lett.98:182302,2007 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/nucl-ex/0611030">arXiv:nucl-ex/0611030</a> <span> [<a href="https://arxiv.org/pdf/nucl-ex/0611030">pdf</a>, <a href="https://arxiv.org/ps/nucl-ex/0611030">ps</a>, <a href="https://arxiv.org/format/nucl-ex/0611030">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.98.182303">10.1103/PhysRevLett.98.182303 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of tensor analyzing powers in deuteron photodisintegration </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Rachek%2C+I+A">I. A. Rachek</a>, <a href="/search/nucl-ex?searchtype=author&query=Barkov%2C+L+M">L. M. Barkov</a>, <a href="/search/nucl-ex?searchtype=author&query=Belostotsky%2C+S+L">S. L. Belostotsky</a>, <a href="/search/nucl-ex?searchtype=author&query=Dmitriev%2C+V+F">V. F. Dmitriev</a>, <a href="/search/nucl-ex?searchtype=author&query=Dyug%2C+M+V">M. V. Dyug</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilman%2C+R">R. Gilman</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=Lazarenko%2C+B+A">B. A. Lazarenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Mishnev%2C+S+I">S. I. Mishnev</a>, <a href="/search/nucl-ex?searchtype=author&query=Nelyubin%2C+V+V">V. V. Nelyubin</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikolenko%2C+D+M">D. M. Nikolenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Osipov%2C+A+V">A. V. Osipov</a>, <a href="/search/nucl-ex?searchtype=author&query=Potterveld%2C+D+H">D. H. Potterveld</a>, <a href="/search/nucl-ex?searchtype=author&query=Sadykov%2C+R+S">R. Sh. Sadykov</a>, <a href="/search/nucl-ex?searchtype=author&query=Shestakov%2C+Y+V">Yu. V. Shestakov</a>, <a href="/search/nucl-ex?searchtype=author&query=Stibunov%2C+V+N">V. N. Stibunov</a>, <a href="/search/nucl-ex?searchtype=author&query=Toporkov%2C+D+K">D. K. Toporkov</a>, <a href="/search/nucl-ex?searchtype=author&query=de+Vries%2C+H">H. de Vries</a>, <a href="/search/nucl-ex?searchtype=author&query=Zevakov%2C+S+A">S. A. Zevakov</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="nucl-ex/0611030v2-abstract-short" style="display: inline;"> New accurate measurement of tensor analyzing powers T20, T21 and T22 in deuteron photodisintegration has been performed. Wide-aperture non-magnetic detectors allowed to cover broad kinematic ranges in a single setup: photon energy = 25 to 600 MeV, proton emission angle in CM = 24 to 48 deg. and 70 to 102 deg. New data provide a significant improvement of a few existing measurements. The angular… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0611030v2-abstract-full').style.display = 'inline'; document.getElementById('nucl-ex/0611030v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="nucl-ex/0611030v2-abstract-full" style="display: none;"> New accurate measurement of tensor analyzing powers T20, T21 and T22 in deuteron photodisintegration has been performed. Wide-aperture non-magnetic detectors allowed to cover broad kinematic ranges in a single setup: photon energy = 25 to 600 MeV, proton emission angle in CM = 24 to 48 deg. and 70 to 102 deg. New data provide a significant improvement of a few existing measurements. The angular dependency of the tensor asymmetries in deuteron photodisintegration is extracted for the first time. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0611030v2-abstract-full').style.display = 'none'; document.getElementById('nucl-ex/0611030v2-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, 2007; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 November, 2006; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2006. </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">4 pages, 5 figures, submitted to Phys. Rev. Lett</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.Lett.98:182303,2007 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/nucl-ex/0607005">arXiv:nucl-ex/0607005</a> <span> [<a href="https://arxiv.org/pdf/nucl-ex/0607005">pdf</a>, <a href="https://arxiv.org/ps/nucl-ex/0607005">ps</a>, <a href="https://arxiv.org/format/nucl-ex/0607005">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.97.192001">10.1103/PhysRevLett.97.192001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Determination of the Charged Pion Form Factor at Q2=1.60 and 2.45 (GeV/c)2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Fpi2+collaboration"> Fpi2 collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Horn%2C+T">T. Horn</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=Barrett%2C+B">B. Barrett</a>, <a href="/search/nucl-ex?searchtype=author&query=Beise%2C+E+J">E. J. Beise</a>, <a href="/search/nucl-ex?searchtype=author&query=Blok%2C+H+P">H. P. Blok</a>, <a href="/search/nucl-ex?searchtype=author&query=Boeglin%2C+W">W. Boeglin</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=Breuer%2C+H">H. Breuer</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=Christy%2C+M+E">M. E. Christy</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=Gibson%2C+E">E. Gibson</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=Jin%2C+S">S. Jin</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=Kim%2C+W">W. Kim</a>, <a href="/search/nucl-ex?searchtype=author&query=King%2C+P+M">P. M. King</a>, <a href="/search/nucl-ex?searchtype=author&query=Kovaltchouk%2C+V">V. Kovaltchouk</a>, <a href="/search/nucl-ex?searchtype=author&query=Liu%2C+J">J. Liu</a>, <a href="/search/nucl-ex?searchtype=author&query=Lolos%2C+G+J">G. J. Lolos</a> , et al. (29 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="nucl-ex/0607005v1-abstract-short" style="display: inline;"> The H(e,e'pi+)n cross section was measured at four-momentum transfers of Q2=1.60 and 2.45 GeV2 at an invariant mass of the photon nucleon system of W=2.22 GeV. The charged pion form factor (F_pi) was extracted from the data by comparing the separated longitudinal pion electroproduction cross section to a Regge model prediction in which F_pi is a free parameter. The results indicate that the pion… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0607005v1-abstract-full').style.display = 'inline'; document.getElementById('nucl-ex/0607005v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="nucl-ex/0607005v1-abstract-full" style="display: none;"> The H(e,e'pi+)n cross section was measured at four-momentum transfers of Q2=1.60 and 2.45 GeV2 at an invariant mass of the photon nucleon system of W=2.22 GeV. The charged pion form factor (F_pi) was extracted from the data by comparing the separated longitudinal pion electroproduction cross section to a Regge model prediction in which F_pi is a free parameter. The results indicate that the pion form factor deviates from the charge-radius constrained monopole form at these values of Q2 by one sigma, but is still far from its perturbative Quantum Chromo-Dynamics prediction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0607005v1-abstract-full').style.display = 'none'; document.getElementById('nucl-ex/0607005v1-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, 2006; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2006. </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">4 pages, 3 figures, submitted to Physical Review Letters</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal 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