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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.01981">arXiv:2207.01981</a> <span> [<a href="https://arxiv.org/pdf/2207.01981">pdf</a>, <a href="https://arxiv.org/format/2207.01981">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"> Polarization observables in double neutral pion photoproduction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Collaboration%2C+C">CBELSA/TAPS Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/nucl-ex?searchtype=author&query=Seifen%2C+T">T. Seifen</a>, <a href="/search/nucl-ex?searchtype=author&query=Hartmann%2C+J">J. Hartmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Afzal%2C+F">F. Afzal</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Becker%2C+M">M. Becker</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlin%2C+A">A. Berlin</a>, <a href="/search/nucl-ex?searchtype=author&query=Bichow%2C+M">M. Bichow</a>, <a href="/search/nucl-ex?searchtype=author&query=Brinkmann%2C+K+-">K. -Th. Brinkmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Crede%2C+V">V. Crede</a>, <a href="/search/nucl-ex?searchtype=author&query=Dieterle%2C+M">M. Dieterle</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutz%2C+H">H. Dutz</a>, <a href="/search/nucl-ex?searchtype=author&query=Eberhardt%2C+H">H. Eberhardt</a>, <a href="/search/nucl-ex?searchtype=author&query=Elsner%2C+D">D. Elsner</a>, <a href="/search/nucl-ex?searchtype=author&query=Fornet-Ponse%2C+K">K. Fornet-Ponse</a>, <a href="/search/nucl-ex?searchtype=author&query=Friedrich%2C+S">St. Friedrich</a>, <a href="/search/nucl-ex?searchtype=author&query=Frommberger%2C+F">F. Frommberger</a>, <a href="/search/nucl-ex?searchtype=author&query=Funke%2C+C">Ch. Funke</a>, <a href="/search/nucl-ex?searchtype=author&query=Gottschall%2C+M">M. Gottschall</a>, <a href="/search/nucl-ex?searchtype=author&query=Gr%C3%BCner%2C+M">M. Gr眉ner</a>, <a href="/search/nucl-ex?searchtype=author&query=G%C3%B6rtz%2C+S">St. G枚rtz</a>, <a href="/search/nucl-ex?searchtype=author&query=Gutz%2C+E">E. Gutz</a>, <a href="/search/nucl-ex?searchtype=author&query=Hammann%2C+C">Ch. Hammann</a> , et al. (52 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2207.01981v1-abstract-short" style="display: inline;"> Measurements of target asymmetries and double-polarization observables for the reaction $纬p\to p蟺^0蟺^0$ are reported. The data were taken with the CBELSA/TAPS experiment at the ELSA facility (Bonn University) using the Bonn frozen-spin butanol (C$_4$H$_9$OH) target, which provided transversely polarized protons. Linearly polarized photons were produced via bremsstrahlung off a diamond crystal. The… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.01981v1-abstract-full').style.display = 'inline'; document.getElementById('2207.01981v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.01981v1-abstract-full" style="display: none;"> Measurements of target asymmetries and double-polarization observables for the reaction $纬p\to p蟺^0蟺^0$ are reported. The data were taken with the CBELSA/TAPS experiment at the ELSA facility (Bonn University) using the Bonn frozen-spin butanol (C$_4$H$_9$OH) target, which provided transversely polarized protons. Linearly polarized photons were produced via bremsstrahlung off a diamond crystal. The data cover the photon energy range from $E_纬$=650 MeV to $E_纬$=2600 MeV and nearly the complete angular range. The results have been included in the BnGa partial wave analysis. Experimental results and the fit agree very well. Observed systematic differences in the branching ratios for decays of $N^*$ and $螖^*$ resonances are attributed to the internal structure of these excited nucleon states. Resonances which can be assigned to SU(6)$\times$O(3) two-oscillator configurations show larger branching ratios to intermediate states with non-zero intrinsic orbital angular momenta than resonances assigned to one-oscillator configurations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.01981v1-abstract-full').style.display = 'none'; document.getElementById('2207.01981v1-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 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">21 pages, 27 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/2108.13319">arXiv:2108.13319</a> <span> [<a href="https://arxiv.org/pdf/2108.13319">pdf</a>, <a href="https://arxiv.org/format/2108.13319">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"> Measurement of the $纬n\rightarrow K^0危^0$ differential cross section over the $K^*$ threshold </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Kohl%2C+K">K. Kohl</a>, <a href="/search/nucl-ex?searchtype=author&query=Jude%2C+T+C">T. C. Jude</a>, <a href="/search/nucl-ex?searchtype=author&query=Alef%2C+S">S. Alef</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Braghieri%2C+A">A. Braghieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Cole%2C+P">P. Cole</a>, <a href="/search/nucl-ex?searchtype=author&query=Salvo%2C+R+D">R. D. Salvo</a>, <a href="/search/nucl-ex?searchtype=author&query=Fantini%2C+A">A. Fantini</a>, <a href="/search/nucl-ex?searchtype=author&query=Freyermuth%2C+O">O. Freyermuth</a>, <a href="/search/nucl-ex?searchtype=author&query=Frommberger%2C+F">F. Frommberger</a>, <a href="/search/nucl-ex?searchtype=author&query=Ghio%2C+F">F. Ghio</a>, <a href="/search/nucl-ex?searchtype=author&query=Gridnev%2C+A">A. Gridnev</a>, <a href="/search/nucl-ex?searchtype=author&query=Hammann%2C+D">D. Hammann</a>, <a href="/search/nucl-ex?searchtype=author&query=Hannappel%2C+J">J. Hannappel</a>, <a href="/search/nucl-ex?searchtype=author&query=Kozlenko%2C+N">N. Kozlenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Lapik%2C+A">A. Lapik</a>, <a href="/search/nucl-ex?searchtype=author&query=Sandri%2C+P+L">P. Levi Sandri</a>, <a href="/search/nucl-ex?searchtype=author&query=Lisin%2C+V">V. Lisin</a>, <a href="/search/nucl-ex?searchtype=author&query=Mandaglio%2C+G">G. Mandaglio</a>, <a href="/search/nucl-ex?searchtype=author&query=Messi%2C+R">R. Messi</a>, <a href="/search/nucl-ex?searchtype=author&query=Moricciani%2C+D">D. Moricciani</a>, <a href="/search/nucl-ex?searchtype=author&query=Nedorezov%2C+V">V. Nedorezov</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Novinsky%2C+D">D. Novinsky</a>, <a href="/search/nucl-ex?searchtype=author&query=Pedroni%2C+P">P. Pedroni</a> , et al. (8 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2108.13319v3-abstract-short" style="display: inline;"> The differential cross section for the quasi-free photoproduction reaction $纬n\rightarrow K^0危^0$ was measured at BGOOD at ELSA from threshold to a centre-of-mass energy of 2400 MeV. Close to threshold the results are consistent with existing data and are in agreement with partial wave analysis solutions over the full measured energy range, with a large coupling to the $螖$(1900)1/2- evident. This… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.13319v3-abstract-full').style.display = 'inline'; document.getElementById('2108.13319v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2108.13319v3-abstract-full" style="display: none;"> The differential cross section for the quasi-free photoproduction reaction $纬n\rightarrow K^0危^0$ was measured at BGOOD at ELSA from threshold to a centre-of-mass energy of 2400 MeV. Close to threshold the results are consistent with existing data and are in agreement with partial wave analysis solutions over the full measured energy range, with a large coupling to the $螖$(1900)1/2- evident. This is the first dataset covering the K* threshold region, where there are model predictions of dynamically generated vector meson-baryon resonance contributions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.13319v3-abstract-full').style.display = 'none'; document.getElementById('2108.13319v3-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, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 August, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 8 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2006.12437">arXiv:2006.12437</a> <span> [<a href="https://arxiv.org/pdf/2006.12437">pdf</a>, <a href="https://arxiv.org/ps/2006.12437">ps</a>, <a href="https://arxiv.org/format/2006.12437">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.2021.136559">10.1016/j.physletb.2021.136559 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Observation of a cusp-like structure in the $纬p \rightarrow K^+危^0$ cross section at forward angles and low momentum transfer </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Jude%2C+T+C">T. C. Jude</a>, <a href="/search/nucl-ex?searchtype=author&query=Alef%2C+S">S. Alef</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+P">P. Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bayadilov%2C+D">D. Bayadilov</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Bella%2C+A">A. Bella</a>, <a href="/search/nucl-ex?searchtype=author&query=Bieling%2C+J">J. Bieling</a>, <a href="/search/nucl-ex?searchtype=author&query=Braghieri%2C+A">A. Braghieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Cole%2C+P+L">P. L. Cole</a>, <a href="/search/nucl-ex?searchtype=author&query=Elsner%2C+D">D. Elsner</a>, <a href="/search/nucl-ex?searchtype=author&query=Di+Salvo%2C+R">R. Di Salvo</a>, <a href="/search/nucl-ex?searchtype=author&query=Fantini%2C+A">A. Fantini</a>, <a href="/search/nucl-ex?searchtype=author&query=Freyermuth%2C+O">O. Freyermuth</a>, <a href="/search/nucl-ex?searchtype=author&query=Frommberger%2C+F">F. Frommberger</a>, <a href="/search/nucl-ex?searchtype=author&query=Ghio%2C+F">F. Ghio</a>, <a href="/search/nucl-ex?searchtype=author&query=Goertz%2C+S">S. Goertz</a>, <a href="/search/nucl-ex?searchtype=author&query=Gridnev%2C+A">A. Gridnev</a>, <a href="/search/nucl-ex?searchtype=author&query=Hammann%2C+D">D. Hammann</a>, <a href="/search/nucl-ex?searchtype=author&query=Hannappel%2C+J">J. Hannappel</a>, <a href="/search/nucl-ex?searchtype=author&query=Kohl%2C+K">K. Kohl</a>, <a href="/search/nucl-ex?searchtype=author&query=Kozlenko%2C+N">N. Kozlenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Sandri%2C+A+L+P+L">A. Lapik P. Levi Sandri</a>, <a href="/search/nucl-ex?searchtype=author&query=Lisin%2C+V">V. Lisin</a>, <a href="/search/nucl-ex?searchtype=author&query=Mandaglio%2C+G">G. Mandaglio</a>, <a href="/search/nucl-ex?searchtype=author&query=Messi%2C+F">F. Messi</a> , et al. (17 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2006.12437v2-abstract-short" style="display: inline;"> The $纬p \rightarrow K^+危^0$ differential cross section at extremely forward angles was measured at the BGOOD experiment. A three-quarter drop in strength over a narrow range in energy and a strong dependence on the polar angle of the $K^+$ in the centre-of-mass of the reaction is observed at a centre-of-mass energy of 1900\,MeV. Residing close to multiple open and hidden strangeness thresholds, th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.12437v2-abstract-full').style.display = 'inline'; document.getElementById('2006.12437v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.12437v2-abstract-full" style="display: none;"> The $纬p \rightarrow K^+危^0$ differential cross section at extremely forward angles was measured at the BGOOD experiment. A three-quarter drop in strength over a narrow range in energy and a strong dependence on the polar angle of the $K^+$ in the centre-of-mass of the reaction is observed at a centre-of-mass energy of 1900\,MeV. Residing close to multiple open and hidden strangeness thresholds, the structure appears consistent with meson-baryon threshold effects which may contribute to the reaction mechanism. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.12437v2-abstract-full').style.display = 'none'; document.getElementById('2006.12437v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 August, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages (including a 2 page appendix of tabulated data), 10 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/2006.12350">arXiv:2006.12350</a> <span> [<a href="https://arxiv.org/pdf/2006.12350">pdf</a>, <a href="https://arxiv.org/format/2006.12350">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epja/s10050-021-00392-0">10.1140/epja/s10050-021-00392-0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> $K^+螞$ photoproduction at forward angles and low momentum transfer </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Alef%2C+S">S. Alef</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+P">P. Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bayadilov%2C+D">D. Bayadilov</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Bella%2C+A">A. Bella</a>, <a href="/search/nucl-ex?searchtype=author&query=Bieling%2C+J">J. Bieling</a>, <a href="/search/nucl-ex?searchtype=author&query=Braghieri%2C+A">A. Braghieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Cole%2C+P+L">P. L. Cole</a>, <a href="/search/nucl-ex?searchtype=author&query=Elsner%2C+D">D. Elsner</a>, <a href="/search/nucl-ex?searchtype=author&query=Di+Salvo%2C+R">R. Di Salvo</a>, <a href="/search/nucl-ex?searchtype=author&query=Fantini%2C+A">A. Fantini</a>, <a href="/search/nucl-ex?searchtype=author&query=Freyermuth%2C+O">O. Freyermuth</a>, <a href="/search/nucl-ex?searchtype=author&query=Frommberger%2C+F">F. Frommberger</a>, <a href="/search/nucl-ex?searchtype=author&query=Ghio%2C+F">F. Ghio</a>, <a href="/search/nucl-ex?searchtype=author&query=Goertz%2C+S">S. Goertz</a>, <a href="/search/nucl-ex?searchtype=author&query=Gridnev%2C+A">A. Gridnev</a>, <a href="/search/nucl-ex?searchtype=author&query=Hammann%2C+D">D. Hammann</a>, <a href="/search/nucl-ex?searchtype=author&query=Hannappel%2C+J">J. Hannappel</a>, <a href="/search/nucl-ex?searchtype=author&query=Jude%2C+T+C">T. C. Jude</a>, <a href="/search/nucl-ex?searchtype=author&query=Kohl%2C+K">K. Kohl</a>, <a href="/search/nucl-ex?searchtype=author&query=Kozlenko%2C+N">N. Kozlenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Sandri%2C+A+L+P+L">A. Lapik P. Levi Sandri</a>, <a href="/search/nucl-ex?searchtype=author&query=Lisin%2C+V">V. Lisin</a>, <a href="/search/nucl-ex?searchtype=author&query=Mandaglio%2C+G">G. Mandaglio</a>, <a href="/search/nucl-ex?searchtype=author&query=Messi%2C+F">F. Messi</a> , et al. (17 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2006.12350v3-abstract-short" style="display: inline;"> $纬p \rightarrow K^+ 螞$ differential cross sections and recoil polarisation data from threshold for extremely forward angles are presented. The measurements were performed at the BGOOD experiment at ELSA, utilising the high angular and momentum resolution forward spectrometer for charged particle identification. The data discriminates between conflicting results in the world data set and enable ext… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.12350v3-abstract-full').style.display = 'inline'; document.getElementById('2006.12350v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.12350v3-abstract-full" style="display: none;"> $纬p \rightarrow K^+ 螞$ differential cross sections and recoil polarisation data from threshold for extremely forward angles are presented. The measurements were performed at the BGOOD experiment at ELSA, utilising the high angular and momentum resolution forward spectrometer for charged particle identification. The data discriminates between conflicting results in the world data set and enable extraction of the cross section as the minimum momentum transfer to the recoiling hyperon is approached. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.12350v3-abstract-full').style.display = 'none'; document.getElementById('2006.12350v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages (including a 2 page appendix), 14 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. A 57, 80 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1907.13387">arXiv:1907.13387</a> <span> [<a href="https://arxiv.org/pdf/1907.13387">pdf</a>, <a href="https://arxiv.org/format/1907.13387">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epja/i2019-12880-5">10.1140/epja/i2019-12880-5 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Hyperon II: Properties of excited hyperons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Matveev%2C+M">M. Matveev</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Thoma%2C+U">U. Thoma</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</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="1907.13387v1-abstract-short" style="display: inline;"> We report properties of $螞$ and $危$ hyperon resonances formed in $K^-$ induced reactions. Special emphasis is laid on the analysis of the three-body final states $2蟺^0螞$ and $2蟺^0危$ and of the quasi-two-body final states $蟺螞(1520)$, $\bar K螖(1232)$, $蟺危(1385)$, $\bar K^*N$, and $蠅螞$. We give pole positions of $螞$ and $危$ hyperon resonances and transition residues from the $K^-p$ initial to various… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.13387v1-abstract-full').style.display = 'inline'; document.getElementById('1907.13387v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1907.13387v1-abstract-full" style="display: none;"> We report properties of $螞$ and $危$ hyperon resonances formed in $K^-$ induced reactions. Special emphasis is laid on the analysis of the three-body final states $2蟺^0螞$ and $2蟺^0危$ and of the quasi-two-body final states $蟺螞(1520)$, $\bar K螖(1232)$, $蟺危(1385)$, $\bar K^*N$, and $蠅螞$. We give pole positions of $螞$ and $危$ hyperon resonances and transition residues from the $K^-p$ initial to various final states as well as Breit-Wigner masses and widths and decay branching ratios. Twenty resonances and "bumps" reported in the Review of Particle Physics are not required in our fits, evidence for five new resonances is reported. The observed mass spectrum is compared to the spectrum calculated in the Bonn quark model. Three spin doublets, six $螞$ hyperons, are tentatively assigned to the SU(3) singlet system. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.13387v1-abstract-full').style.display = 'none'; document.getElementById('1907.13387v1-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 July, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">18 pages, 10 Figures, 3 Tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1907.03645">arXiv:1907.03645</a> <span> [<a href="https://arxiv.org/pdf/1907.03645">pdf</a>, <a href="https://arxiv.org/format/1907.03645">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epja/i2019-12878-y">10.1140/epja/i2019-12878-y <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Hyperon I: Partial wave amplitudes for $K^-p$ scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=~Matveev%2C+M">M. ~Matveev</a>, <a href="/search/nucl-ex?searchtype=author&query=~Sarantsev%2C+A+V">A. V. ~Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovic%2C+A+V">A. V. Anisovic</a>, <a href="/search/nucl-ex?searchtype=author&query=Thoma%2C+U">U. Thoma</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</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="1907.03645v1-abstract-short" style="display: inline;"> Early data on $K^-$ induced reactions off protons are collected and used in a coupled-channel partial wave analysis (PWA). Data which had been published in the form of Legendre coefficients are included in the PWA. In a {\it primary} fit using 3* and 4* resonances only, we observe some significant discrepancies with the data. In a systematic search for new $螞$ and $危$ hyperon resonances, additiona… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.03645v1-abstract-full').style.display = 'inline'; document.getElementById('1907.03645v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1907.03645v1-abstract-full" style="display: none;"> Early data on $K^-$ induced reactions off protons are collected and used in a coupled-channel partial wave analysis (PWA). Data which had been published in the form of Legendre coefficients are included in the PWA. In a {\it primary} fit using 3* and 4* resonances only, we observe some significant discrepancies with the data. In a systematic search for new $螞$ and $危$ hyperon resonances, additional candidates are found. The significance of the known and of the additional resonances is evaluated. Seventeen resonances listed with 1* or 2* and one resonance listed with 3* in the Review of Particle Properties cannot be confirmed, five new hyperons are suggested. The partial-wave amplitudes deduced in this analysis are compared to those from other analyses. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.03645v1-abstract-full').style.display = 'none'; document.getElementById('1907.03645v1-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 July, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">28 pages, 27 figures, 9 Tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.05456">arXiv:1905.05456</a> <span> [<a href="https://arxiv.org/pdf/1905.05456">pdf</a>, <a href="https://arxiv.org/format/1905.05456">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"> Hyperon I: Study of the $螞(1405)$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V">V. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Schumacher%2C+R+A">R. A. Schumacher</a>, <a href="/search/nucl-ex?searchtype=author&query=Thoma%2C+U">U. Thoma</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</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="1905.05456v1-abstract-short" style="display: inline;"> Low-energy data on the three charge states in $纬p \to K^+(危蟺)$ from CLAS at JLab, on $K^-p\to 蟺^0蟺^0螞$ and $蟺^0蟺^0危$ from the Crystal Ball at BNL, bubble chamber data on $K^-p\to蟺^-蟺^+蟺^{\pm}危^{\mp}$, low-energy total cross sections on $K^-$ induced reactions, and data on the $K^-p$ atom are fitted with the BnGa partial-wave-analysis program. We find that the data can be fitted well with just one… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.05456v1-abstract-full').style.display = 'inline'; document.getElementById('1905.05456v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.05456v1-abstract-full" style="display: none;"> Low-energy data on the three charge states in $纬p \to K^+(危蟺)$ from CLAS at JLab, on $K^-p\to 蟺^0蟺^0螞$ and $蟺^0蟺^0危$ from the Crystal Ball at BNL, bubble chamber data on $K^-p\to蟺^-蟺^+蟺^{\pm}危^{\mp}$, low-energy total cross sections on $K^-$ induced reactions, and data on the $K^-p$ atom are fitted with the BnGa partial-wave-analysis program. We find that the data can be fitted well with just one isoscalar spin-1/2 negative-parity pole, the $螞(1405)$, and background contributions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.05456v1-abstract-full').style.display = 'none'; document.getElementById('1905.05456v1-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">originally announced</span> May 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, 10 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/1812.02106">arXiv:1812.02106</a> <span> [<a href="https://arxiv.org/pdf/1812.02106">pdf</a>, <a href="https://arxiv.org/format/1812.02106">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.122.162301">10.1103/PhysRevLett.122.162301 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First Measurements of the Double-Polarization Observables $F$, $P$, and $H$ in $蠅$ Photoproduction off Transversely Polarized Protons in the $N^\ast$ Resonance Region </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Roy%2C+P">P. Roy</a>, <a href="/search/nucl-ex?searchtype=author&query=Park%2C+S">S. Park</a>, <a href="/search/nucl-ex?searchtype=author&query=Crede%2C+V">V. Crede</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Wei%2C+N+C">N. C. Wei</a>, <a href="/search/nucl-ex?searchtype=author&query=Huang%2C+F">F. Huang</a>, <a href="/search/nucl-ex?searchtype=author&query=Nakayama%2C+K">K. Nakayama</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Angelini%2C+G">G. Angelini</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brock%2C+J">J. Brock</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V+D">V. D. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+F">F. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Carlin%2C+C">C. Carlin</a> , et al. (123 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1812.02106v2-abstract-short" style="display: inline;"> First measurements of double-polarization observables in $蠅$ photoproduction off the proton are presented using transverse target polarization and data from the CEBAF Large Acceptance Spectrometer (CLAS) FROST experiment at Jefferson Lab. The beam-target asymmetry $F$ has been measured using circularly polarized, tagged photons in the energy range 1200 - 2700 MeV, and the beam-target asymmetries… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.02106v2-abstract-full').style.display = 'inline'; document.getElementById('1812.02106v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1812.02106v2-abstract-full" style="display: none;"> First measurements of double-polarization observables in $蠅$ photoproduction off the proton are presented using transverse target polarization and data from the CEBAF Large Acceptance Spectrometer (CLAS) FROST experiment at Jefferson Lab. The beam-target asymmetry $F$ has been measured using circularly polarized, tagged photons in the energy range 1200 - 2700 MeV, and the beam-target asymmetries $H$ and $P$ have been measured using linearly polarized tagged photons in the energy range 1200 - 2000 MeV. These measurements significantly increase the database on polarization observables. The results are included in two partial-wave analyses and reveal significant contributions from several nucleon ($N^\ast$) resonances. In particular, contributions from new $N^\ast$ resonances listed in the Review of Particle Properties are observed, which aid in reaching the goal of mapping out the nucleon resonance spectrum. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.02106v2-abstract-full').style.display = 'none'; document.getElementById('1812.02106v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Two authors added, figures updated</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-18-2879 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 122, 162301 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1805.04561">arXiv:1805.04561</a> <span> [<a href="https://arxiv.org/pdf/1805.04561">pdf</a>, <a href="https://arxiv.org/format/1805.04561">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.98.045205">10.1103/PhysRevC.98.045205 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Beam-Target Helicity Asymmetry $E$ in $K^{0}螞$ and $K^{0}危^0$ Photoproduction on the Neutron </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=CLAS+Collaboration"> CLAS Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Ho%2C+D+H">D. H. Ho</a>, <a href="/search/nucl-ex?searchtype=author&query=Schumacher%2C+R+A">R. A. Schumacher</a>, <a href="/search/nucl-ex?searchtype=author&query=D%27Angelo%2C+A">A. D'Angelo</a>, <a href="/search/nucl-ex?searchtype=author&query=Deur%2C+A">A. Deur</a>, <a href="/search/nucl-ex?searchtype=author&query=Fleming%2C+J">J. Fleming</a>, <a href="/search/nucl-ex?searchtype=author&query=Hanretty%2C+C">C. Hanretty</a>, <a href="/search/nucl-ex?searchtype=author&query=Kageya%2C+T">T. Kageya</a>, <a href="/search/nucl-ex?searchtype=author&query=Klein%2C+F+J">F. J. Klein</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Lowry%2C+M+M">M. M. Lowry</a>, <a href="/search/nucl-ex?searchtype=author&query=Lu%2C+H">H. Lu</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Peng%2C+P">P. Peng</a>, <a href="/search/nucl-ex?searchtype=author&query=Sandorfi%2C+A+M">A. M. Sandorfi</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Strakovsky%2C+I+I">I. I. Strakovsky</a>, <a href="/search/nucl-ex?searchtype=author&query=Walford%2C+N+K">N. K. Walford</a>, <a href="/search/nucl-ex?searchtype=author&query=Wei%2C+X">X. Wei</a>, <a href="/search/nucl-ex?searchtype=author&query=Workman%2C+R+L">R. L. Workman</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adikaram%2C+D">D. Adikaram</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+J">J. Ball</a> , et al. (124 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1805.04561v2-abstract-short" style="display: inline;"> We report the first measurements of the $E$ beam-target helicity asymmetry for the $\vec纬 \vec{n} \to K^{0}螞$, and $K^{0}危^{0}$ channels in the energy range 1.70$\leq W\leq$2.34 GeV. The CLAS system at Jefferson Lab uses a circularly polarized photon beam and a target consisting of longitudinally polarized solid molecular hydrogen deuteride with low background contamination for the measurements. T… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1805.04561v2-abstract-full').style.display = 'inline'; document.getElementById('1805.04561v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1805.04561v2-abstract-full" style="display: none;"> We report the first measurements of the $E$ beam-target helicity asymmetry for the $\vec纬 \vec{n} \to K^{0}螞$, and $K^{0}危^{0}$ channels in the energy range 1.70$\leq W\leq$2.34 GeV. The CLAS system at Jefferson Lab uses a circularly polarized photon beam and a target consisting of longitudinally polarized solid molecular hydrogen deuteride with low background contamination for the measurements. The multivariate analysis method boosted decision trees was used to isolate the reactions of interest. Comparisons with predictions from the KaonMAID, SAID, and Bonn-Gatchina models are presented. These results will help separate the isospin $I=0$ and $I=1$ photo-coupling transition amplitudes in pseudoscalar meson photoproduction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1805.04561v2-abstract-full').style.display = 'none'; document.getElementById('1805.04561v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 October, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 May, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">14 pages, 9 figures; Revised to match published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 98, 045205 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1803.06814">arXiv:1803.06814</a> <span> [<a href="https://arxiv.org/pdf/1803.06814">pdf</a>, <a href="https://arxiv.org/format/1803.06814">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2018.06.034">10.1016/j.physletb.2018.06.034 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Proton-$畏^\prime$ interactions at threshold </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V">V. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Dugger%2C+M">M. Dugger</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Ritchie%2C+B+G">B. G. Ritchie</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Thoma%2C+U">U. Thoma</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="1803.06814v1-abstract-short" style="display: inline;"> Recent data on photoproduction of $畏'$ mesons off protons have been included in the data base for the Bonn-Gatchina partial wave analysis. The real and imaginary parts of the $S$-wave $畏^\prime p\to 畏^\prime p$ scattering amplitude in the threshold region were fit to yield the $畏^\prime p$ scattering length and the interaction range. This new analysis found… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1803.06814v1-abstract-full').style.display = 'inline'; document.getElementById('1803.06814v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1803.06814v1-abstract-full" style="display: none;"> Recent data on photoproduction of $畏'$ mesons off protons have been included in the data base for the Bonn-Gatchina partial wave analysis. The real and imaginary parts of the $S$-wave $畏^\prime p\to 畏^\prime p$ scattering amplitude in the threshold region were fit to yield the $畏^\prime p$ scattering length and the interaction range. This new analysis found $|a_{畏^\prime p}|= (0.403\pm 0.015\pm 0.060)$ fm and a phase $蠁=(87\pm2)^\circ$, while the range parameter is not well-constrained. The striking behavior of the GRAAL data on the beam asymmetry in the threshold region suggests that a narrow proton-$畏'$ resonance might exist. However, the scattering length was found to be relatively insensitive to the possible existence of this narrow resonance. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1803.06814v1-abstract-full').style.display = 'none'; document.getElementById('1803.06814v1-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 March, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">5 pages, 5 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1712.07549">arXiv:1712.07549</a> <span> [<a href="https://arxiv.org/pdf/1712.07549">pdf</a>, <a href="https://arxiv.org/format/1712.07549">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.119.062004">10.1103/PhysRevLett.119.062004 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Strong evidence for nucleon resonances near 1900\,MeV </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V">V. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Had%C5%BEimehmedovi%C4%87%2C+M">M. Had啪imehmedovi膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Ireland%2C+D+G">D. G. Ireland</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Omerovi%C4%87%2C+R">R. Omerovi膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Osmanovi%C4%87%2C+H">H. Osmanovi膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Stahov%2C+J">J. Stahov</a>, <a href="/search/nucl-ex?searchtype=author&query=%C5%A0varc%2C+A">A. 艩varc</a>, <a href="/search/nucl-ex?searchtype=author&query=Thoma%2C+U">U. Thoma</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="1712.07549v1-abstract-short" style="display: inline;"> Data on the reaction $纬p\to K^+螞$ from the CLAS experiments are used to derive the leading multipoles, $E_{0+}$, $M_{1-}$, $E_{1+}$, and $M_{1+}$, from the production threshold to 2180\,MeV in 24 slices of the invariant mass. The four multipoles are determined without any constraints. The multipoles are fitted using a multichannel $L+P$ model which allows us to search for singularities and to extr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.07549v1-abstract-full').style.display = 'inline'; document.getElementById('1712.07549v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1712.07549v1-abstract-full" style="display: none;"> Data on the reaction $纬p\to K^+螞$ from the CLAS experiments are used to derive the leading multipoles, $E_{0+}$, $M_{1-}$, $E_{1+}$, and $M_{1+}$, from the production threshold to 2180\,MeV in 24 slices of the invariant mass. The four multipoles are determined without any constraints. The multipoles are fitted using a multichannel $L+P$ model which allows us to search for singularities and to extract the positions of poles on the complex energy plane in an almost model-independent method. The multipoles are also used as additional constraints in an energy-dependent analysis of a large body of pion and photo-induced reactions within the Bonn-Gatchina (BnGa) partial wave analysis. The study confirms the existence of poles due to nucleon resonances with spin-parity $J^P = 1/2^-; 1/2^+$, and $3/2^+$ in the region at about 1.9\,GeV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.07549v1-abstract-full').style.display = 'none'; document.getElementById('1712.07549v1-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 December, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 2 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1712.07537">arXiv:1712.07537</a> <span> [<a href="https://arxiv.org/pdf/1712.07537">pdf</a>, <a href="https://arxiv.org/format/1712.07537">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epja/i2017-12443-x">10.1140/epja/i2017-12443-x <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> $N^*$ resonances from $K螞$ amplitudes in sliced bins in energy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V">V. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Had%C5%BEimehmedovi%C4%87%2C+M">M. Had啪imehmedovi膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Ireland%2C+D+G">D. G. Ireland</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Omerovi%C4%87%2C+R">R. Omerovi膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Stahov%2C+J">J. Stahov</a>, <a href="/search/nucl-ex?searchtype=author&query=%C5%A0varc%2C+A">A. 艩varc</a>, <a href="/search/nucl-ex?searchtype=author&query=Thoma%2C+U">U. Thoma</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="1712.07537v1-abstract-short" style="display: inline;"> The two reactions $纬p\to K^+螞$ and $蟺^-p\to K^0螞$ are analyzed to determine the leading photoproduction multipoles and the pion-induced partial wave amplitudes in slices of the invariant mass. The multipoles and the partial-wave amplitudes are simultaneously fitted in a multichannel Laurent+Pietarinen model (L+P model), which determines the poles in the complex energy plane on the second Riemann s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.07537v1-abstract-full').style.display = 'inline'; document.getElementById('1712.07537v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1712.07537v1-abstract-full" style="display: none;"> The two reactions $纬p\to K^+螞$ and $蟺^-p\to K^0螞$ are analyzed to determine the leading photoproduction multipoles and the pion-induced partial wave amplitudes in slices of the invariant mass. The multipoles and the partial-wave amplitudes are simultaneously fitted in a multichannel Laurent+Pietarinen model (L+P model), which determines the poles in the complex energy plane on the second Riemann sheet close to the physical axes. The results from the L+P fit are compared with the results of an energy-dependent fit based on the Bonn-Gatchina (BnGa) approach. The study confirms the existence of several poles due to nucleon resonances in the region at about 1.9\,GeV with quantum numbers $J^P = 1/2^+$, $3/2^+, 1/2^-, 3/2^-, 5/2^-$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.07537v1-abstract-full').style.display = 'none'; document.getElementById('1712.07537v1-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 December, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">18 pages, 12 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/1711.05176">arXiv:1711.05176</a> <span> [<a href="https://arxiv.org/pdf/1711.05176">pdf</a>, <a href="https://arxiv.org/format/1711.05176">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.97.055202">10.1103/PhysRevC.97.055202 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the beam asymmetry $危$ and the target asymmetry $T$ in the photoproduction of $蠅$ mesons off the proton using CLAS at Jefferson Laboratory </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Roy%2C+P">P. Roy</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Park%2C+S">S. Park</a>, <a href="/search/nucl-ex?searchtype=author&query=Crede%2C+V">V. Crede</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Denisenko%2C+I">I. Denisenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Pereira%2C+S+A">S. Anefalos Pereira</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+J">J. Ball</a>, <a href="/search/nucl-ex?searchtype=author&query=Balossino%2C+I">I. Balossino</a>, <a href="/search/nucl-ex?searchtype=author&query=Bashkanov%2C+M">M. Bashkanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Batourine%2C+V">V. Batourine</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brock%2C+J">J. Brock</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V+D">V. D. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Carlin%2C+C">C. Carlin</a> , et al. (121 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1711.05176v3-abstract-short" style="display: inline;"> The photoproduction of $蠅$ mesons off the proton has been studied in the reaction $纬p\to p\,蠅$ using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target (FROST) in Hall B at the Thomas Jefferson National Accelerator Facility. For the first time, the target asymmetry, $T$, has been measured in photoproduction from the decay $蠅\to蟺^+蟺^-蟺^0$, using a transversely-polarized targe… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.05176v3-abstract-full').style.display = 'inline'; document.getElementById('1711.05176v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.05176v3-abstract-full" style="display: none;"> The photoproduction of $蠅$ mesons off the proton has been studied in the reaction $纬p\to p\,蠅$ using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target (FROST) in Hall B at the Thomas Jefferson National Accelerator Facility. For the first time, the target asymmetry, $T$, has been measured in photoproduction from the decay $蠅\to蟺^+蟺^-蟺^0$, using a transversely-polarized target with energies ranging from just above the reaction threshold up to 2.8 GeV. Significant non-zero values are observed for these asymmetries, reaching about 30-40% in the third-resonance region. New measurements for the photon-beam asymmetry, $危$, are also presented, which agree well with previous CLAS results and extend the world database up to 2.1 GeV. These data and additional $蠅$-photoproduction observables from CLAS were included in a partial-wave analysis within the Bonn-Gatchina framework. Significant contributions from $s$-channel resonance production were found in addition to $t$-channel exchange processes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.05176v3-abstract-full').style.display = 'none'; document.getElementById('1711.05176v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 May, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, 10 figures, author list and references updated</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-17-2583 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 97, 055202 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1708.02608">arXiv:1708.02608</a> <span> [<a href="https://arxiv.org/pdf/1708.02608">pdf</a>, <a href="https://arxiv.org/format/1708.02608">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.96.065209">10.1103/PhysRevC.96.065209 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the helicity asymmetry $E$ in $蠅\to蟺^+蟺^-蟺^0$ photoproduction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Roy%2C+P">P. Roy</a>, <a href="/search/nucl-ex?searchtype=author&query=Park%2C+S">S. Park</a>, <a href="/search/nucl-ex?searchtype=author&query=Crede%2C+V">V. Crede</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Denisenko%2C+I">I. Denisenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryan%2C+M+J">M. J. Amaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Pereira%2C+S+A">S. Anefalos Pereira</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+J">J. Ball</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Batourine%2C+V">V. Batourine</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brock%2C+J">J. Brock</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V+D">V. D. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+F+T">F. T. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Carlin%2C+C">C. Carlin</a> , et al. (109 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1708.02608v2-abstract-short" style="display: inline;"> The double-polarization observable $E$ was studied for the reaction $纬p\to p蠅$ using the CEBAF Large Acceptance Spectrometer (CLAS) in Hall B at the Thomas Jefferson National Accelerator Facility and the longitudinally-polarized frozen-spin target (FROST). The observable was measured from the charged decay mode of the meson, $蠅\to蟺^+蟺^-蟺^0$, using a circularly-polarized tagged-photon beam with ene… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1708.02608v2-abstract-full').style.display = 'inline'; document.getElementById('1708.02608v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1708.02608v2-abstract-full" style="display: none;"> The double-polarization observable $E$ was studied for the reaction $纬p\to p蠅$ using the CEBAF Large Acceptance Spectrometer (CLAS) in Hall B at the Thomas Jefferson National Accelerator Facility and the longitudinally-polarized frozen-spin target (FROST). The observable was measured from the charged decay mode of the meson, $蠅\to蟺^+蟺^-蟺^0$, using a circularly-polarized tagged-photon beam with energies ranging from the $蠅$ threshold at 1.1 to 2.3 GeV. A partial-wave analysis within the Bonn-Gatchina framework found dominant contributions from the $3/2^+$ partial wave near threshold, which is identified with the sub-threshold $N(1720)\,3/2^+$ nucleon resonance. To describe the entire data set, which consisted of $蠅$ differential cross sections and a large variety of polarization observables, further contributions from other nucleon resonances were found to be necessary. With respect to non-resonant mechanisms, $蟺$ exchange in the $t$-channel was found to remain small across the analyzed energy range, while pomeron $t$-channel exchange gradually grew from the reaction threshold to dominate all other contributions above $W \approx 2$ GeV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1708.02608v2-abstract-full').style.display = 'none'; document.getElementById('1708.02608v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 January, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 August, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 8 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-17-2532 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 96, 065209 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1706.05144">arXiv:1706.05144</a> <span> [<a href="https://arxiv.org/pdf/1706.05144">pdf</a>, <a href="https://arxiv.org/ps/1706.05144">ps</a>, <a href="https://arxiv.org/format/1706.05144">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2017.06.052">10.1016/j.physletb.2017.06.052 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> $N^*\to N 畏^\prime$ decays from photoproduction of $畏^\prime$-mesons off protons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V">V. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Collins%2C+P+M">P. M. Collins</a>, <a href="/search/nucl-ex?searchtype=author&query=Dugger%2C+M">M. Dugger</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Ritchie%2C+B+G">B. G. Ritchie</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A">A. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Thoma%2C+U">U. Thoma</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="1706.05144v1-abstract-short" style="display: inline;"> A study of the partial-wave content of the $纬p\to 畏^\prime p$ reaction in the fourth resonance region is presented, which has been prompted by new measurements of polarization observables for that process. Using the Bonn-Gatchina partial-wave formalism, the incorporation of new data indicates that the $N(1895)1/2^-$, $N(1900)3/2^+$, $N(2100)1/2^+$, and $N(2120)3/2^-$ are the most significant contr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.05144v1-abstract-full').style.display = 'inline'; document.getElementById('1706.05144v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1706.05144v1-abstract-full" style="display: none;"> A study of the partial-wave content of the $纬p\to 畏^\prime p$ reaction in the fourth resonance region is presented, which has been prompted by new measurements of polarization observables for that process. Using the Bonn-Gatchina partial-wave formalism, the incorporation of new data indicates that the $N(1895)1/2^-$, $N(1900)3/2^+$, $N(2100)1/2^+$, and $N(2120)3/2^-$ are the most significant contributors to the photoproduction process. New results for the branching ratios of the decays of these more prominent resonances to $N畏^\prime$ final states are provided; such branches have not been indicated in the most recent edition of the Review of Particle Properties. Based on the analysis performed here, predictions for the helicity asymmetry $E$ for the $纬p\to 畏^\prime p$ reaction are presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.05144v1-abstract-full').style.display = 'none'; document.getElementById('1706.05144v1-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 June, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 5 figures, 3 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1706.04748">arXiv:1706.04748</a> <span> [<a href="https://arxiv.org/pdf/1706.04748">pdf</a>, <a href="https://arxiv.org/format/1706.04748">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.96.065201">10.1103/PhysRevC.96.065201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the Differential and Total Cross Sections of the $纬d \to K^0 螞 (p)$ Reaction within the Resonance Region </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Compton%2C+N">N. Compton</a>, <a href="/search/nucl-ex?searchtype=author&query=Taylor%2C+C+E">C. E. Taylor</a>, <a href="/search/nucl-ex?searchtype=author&query=Hicks%2C+K">K. Hicks</a>, <a href="/search/nucl-ex?searchtype=author&query=Cole%2C+P">P. Cole</a>, <a href="/search/nucl-ex?searchtype=author&query=Zachariou%2C+N">N. Zachariou</a>, <a href="/search/nucl-ex?searchtype=author&query=Ilieva%2C+Y">Y. Ilieva</a>, <a href="/search/nucl-ex?searchtype=author&query=Nadel-Turonski%2C+P">P. Nadel-Turonski</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Collaboration%2C+t+C">the CLAS Collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1706.04748v2-abstract-short" style="display: inline;"> We report the first measurement of differential and total cross sections for the $纬d \to K^0螞(p)$ reaction, using data from the CLAS detector at the Thomas Jefferson National Accelerator Facility. Data collected during two separate experimental runs were studied with photon-energy coverage 0.8 - 3.6 GeV and 0.5 - 2.6 GeV, respectively. The two measurements are consistent giving confidence in the m… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.04748v2-abstract-full').style.display = 'inline'; document.getElementById('1706.04748v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1706.04748v2-abstract-full" style="display: none;"> We report the first measurement of differential and total cross sections for the $纬d \to K^0螞(p)$ reaction, using data from the CLAS detector at the Thomas Jefferson National Accelerator Facility. Data collected during two separate experimental runs were studied with photon-energy coverage 0.8 - 3.6 GeV and 0.5 - 2.6 GeV, respectively. The two measurements are consistent giving confidence in the method and determination of systematic uncertainties. The cross sections are compared with predictions from the KAON-MAID theoretical model (without kaon exchange), which deviate from the data at higher W and at forward kaon angles. These data, along with previously published cross sections for $K^+ 螞$ photoproduction, provide essential constraints on the nucleon resonance spectrum. A first partial wave analysis has been performed that describes the data without the introduction of new resonances. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.04748v2-abstract-full').style.display = 'none'; document.getElementById('1706.04748v2-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, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 June, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">18 pages, 16 figures and data table</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 96, 065201 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1706.04280">arXiv:1706.04280</a> <span> [<a href="https://arxiv.org/pdf/1706.04280">pdf</a>, <a href="https://arxiv.org/format/1706.04280">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2017.08.015">10.1016/j.physletb.2017.08.015 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Photon beam asymmetry $危$ in the reaction $\vec纬 p \to p 蠅$ for $E_纬$ = 1.152 to 1.876 GeV </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=CLAS+Collaboration"> CLAS Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Collins%2C+P">P. Collins</a>, <a href="/search/nucl-ex?searchtype=author&query=Ritchie%2C+B+G">B. G. Ritchie</a>, <a href="/search/nucl-ex?searchtype=author&query=Dugger%2C+M">M. Dugger</a>, <a href="/search/nucl-ex?searchtype=author&query=Klein%2C+F+J">F. J. Klein</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A">A. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adikaram%2C+D">D. Adikaram</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Pereira%2C+S+A">S. Anefalos Pereira</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakian%2C+H">H. Avakian</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+J">J. Ball</a>, <a href="/search/nucl-ex?searchtype=author&query=Baltzell%2C+N+A">N. A. Baltzell</a>, <a href="/search/nucl-ex?searchtype=author&query=Bashkanov%2C+M">M. Bashkanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Batourine%2C+V">V. Batourine</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/nucl-ex?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a> , et al. (125 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1706.04280v1-abstract-short" style="display: inline;"> Photon beam asymmetry $危$ measurements for $蠅$ photoproduction in the reaction $\vec纬 p \to 蠅p$ are reported for photon energies from 1.152 to 1.876 GeV. Data were taken using a linearly-polarized tagged photon beam, a cryogenic hydrogen target, and the CLAS spectrometer in Hall B at Jefferson Lab. The measurements obtained markedly increase the size of the database for this observable, extend cov… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.04280v1-abstract-full').style.display = 'inline'; document.getElementById('1706.04280v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1706.04280v1-abstract-full" style="display: none;"> Photon beam asymmetry $危$ measurements for $蠅$ photoproduction in the reaction $\vec纬 p \to 蠅p$ are reported for photon energies from 1.152 to 1.876 GeV. Data were taken using a linearly-polarized tagged photon beam, a cryogenic hydrogen target, and the CLAS spectrometer in Hall B at Jefferson Lab. The measurements obtained markedly increase the size of the database for this observable, extend coverage to higher energies, and resolve discrepancies in previously published data. Comparisons of these new results with predictions from a chiral-quark-based model and from a dynamical coupled-channels model indicate the importance of interferences between $t$-channel meson exchange and $s$- and $u$-channel contributions, underscoring sensitivity to the nucleon resonances included in those descriptions. Comparisons with the Bonn-Gatchina partial-wave analysis indicate the $危$ data reported here help to fix the magnitudes of the interference terms between the leading amplitudes in that calculation (Pomeron exchange and the resonant portion of the $J^P=3/2^+$ partial wave), as well as the resonant portions of the smaller partial waves with $J^P$= $1/2^-$, $3/2^-$, and $5/2^+$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.04280v1-abstract-full').style.display = 'none'; document.getElementById('1706.04280v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 June, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1705.04713">arXiv:1705.04713</a> <span> [<a href="https://arxiv.org/pdf/1705.04713">pdf</a>, <a href="https://arxiv.org/format/1705.04713">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> The Beam-Target Helicity Asymmetry for $\vec纬 \vec{n} \rightarrow 蟺^- p$ in the {\bf{$N^*$} Resonance Region </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Ho%2C+D">D. Ho</a>, <a href="/search/nucl-ex?searchtype=author&query=Peng%2C+P">P. Peng</a>, <a href="/search/nucl-ex?searchtype=author&query=Bass%2C+C">C. Bass</a>, <a href="/search/nucl-ex?searchtype=author&query=Collins%2C+P">P. Collins</a>, <a href="/search/nucl-ex?searchtype=author&query=D%27Angelo%2C+A">A. D'Angelo</a>, <a href="/search/nucl-ex?searchtype=author&query=Deur%2C+A">A. Deur</a>, <a href="/search/nucl-ex?searchtype=author&query=Fleming%2C+J">J. Fleming</a>, <a href="/search/nucl-ex?searchtype=author&query=Hanretty%2C+C">C. Hanretty</a>, <a href="/search/nucl-ex?searchtype=author&query=Kageya%2C+T">T. Kageya</a>, <a href="/search/nucl-ex?searchtype=author&query=Khandaker%2C+M">M. Khandaker</a>, <a href="/search/nucl-ex?searchtype=author&query=Klein%2C+F+J">F. J. Klein</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Laine%2C+V">V. Laine</a>, <a href="/search/nucl-ex?searchtype=author&query=Lowry%2C+M+M">M. M. Lowry</a>, <a href="/search/nucl-ex?searchtype=author&query=Lu%2C+H">H. Lu</a>, <a href="/search/nucl-ex?searchtype=author&query=Nepali%2C+C">C. Nepali</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=O%27Connell%2C+T">T. O'Connell</a>, <a href="/search/nucl-ex?searchtype=author&query=Sandorfi%2C+A+M">A. M. Sandorfi</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Schumacher%2C+R+A">R. A. Schumacher</a>, <a href="/search/nucl-ex?searchtype=author&query=Strakovsky%2C+I+I">I. I. Strakovsky</a>, <a href="/search/nucl-ex?searchtype=author&query=%C5%A0varc%2C+A">A. 艩varc</a>, <a href="/search/nucl-ex?searchtype=author&query=Walford%2C+N+K">N. K. Walford</a>, <a href="/search/nucl-ex?searchtype=author&query=Wei%2C+X">X. Wei</a> , et al. (118 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1705.04713v1-abstract-short" style="display: inline;"> We report the first beam-target double-polarization asymmetries in the $纬+ n(p) \rightarrow 蟺^- + p(p)$ reaction spanning the nucleon resonance region from invariant mass $W$= $1500$ to $2300$ MeV. Circularly polarized photons and longitudinally polarized deuterons in $H\!D$ have been used with the CLAS detector at Jefferson Lab. The exclusive final state has been extracted using three very differ… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1705.04713v1-abstract-full').style.display = 'inline'; document.getElementById('1705.04713v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1705.04713v1-abstract-full" style="display: none;"> We report the first beam-target double-polarization asymmetries in the $纬+ n(p) \rightarrow 蟺^- + p(p)$ reaction spanning the nucleon resonance region from invariant mass $W$= $1500$ to $2300$ MeV. Circularly polarized photons and longitudinally polarized deuterons in $H\!D$ have been used with the CLAS detector at Jefferson Lab. The exclusive final state has been extracted using three very different analyses that show excellent agreement, and these have been used to deduce the {\it{E}} polarization observable for an effective neutron target. These results have been incorporated into new partial wave analyses, and have led to significant revisions for several $纬nN^*$ resonance photo-couplings. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1705.04713v1-abstract-full').style.display = 'none'; document.getElementById('1705.04713v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 May, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 5 figures; Physical Review Letters - in press</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLab-PHY-17-2438 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1703.08398">arXiv:1703.08398</a> <span> [<a href="https://arxiv.org/pdf/1703.08398">pdf</a>, <a href="https://arxiv.org/ps/1703.08398">ps</a>, <a href="https://arxiv.org/format/1703.08398">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epja/i2015-15137-5">10.1140/epja/i2015-15137-5 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Analysis of pion production data measured by HADES in proton-proton collisions at 1.25 GeV </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Agakishiev%2C+G">G. Agakishiev</a>, <a href="/search/nucl-ex?searchtype=author&query=Balanda%2C+A">A. Balanda</a>, <a href="/search/nucl-ex?searchtype=author&query=Belver%2C+D">D. Belver</a>, <a href="/search/nucl-ex?searchtype=author&query=Belyaev%2C+A">A. Belyaev</a>, <a href="/search/nucl-ex?searchtype=author&query=Berger-Chen%2C+J+C">J. C. Berger-Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Blanco%2C+A">A. Blanco</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hmer%2C+M">M. B枚hmer</a>, <a href="/search/nucl-ex?searchtype=author&query=Boyard%2C+J+L">J. L. Boyard</a>, <a href="/search/nucl-ex?searchtype=author&query=Cabanelas%2C+P">P. Cabanelas</a>, <a href="/search/nucl-ex?searchtype=author&query=Chernenko%2C+S">S. Chernenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Dybczak%2C+A">A. Dybczak</a>, <a href="/search/nucl-ex?searchtype=author&query=Epple%2C+E">E. Epple</a>, <a href="/search/nucl-ex?searchtype=author&query=Fabbietti%2C+L">L. Fabbietti</a>, <a href="/search/nucl-ex?searchtype=author&query=Fateev%2C+O">O. Fateev</a>, <a href="/search/nucl-ex?searchtype=author&query=Finocchiaro%2C+P">P. Finocchiaro</a>, <a href="/search/nucl-ex?searchtype=author&query=Fonte%2C+P">P. Fonte</a>, <a href="/search/nucl-ex?searchtype=author&query=Friese%2C+J">J. Friese</a>, <a href="/search/nucl-ex?searchtype=author&query=Fr%C3%B6hlich%2C+I">I. Fr枚hlich</a>, <a href="/search/nucl-ex?searchtype=author&query=Galatyuk%2C+T">T. Galatyuk</a>, <a href="/search/nucl-ex?searchtype=author&query=Garz%C3%B3n%2C+J+A">J. A. Garz贸n</a>, <a href="/search/nucl-ex?searchtype=author&query=Gernh%C3%A4user%2C+R">R. Gernh盲user</a>, <a href="/search/nucl-ex?searchtype=author&query=G%C3%B6bel%2C+K">K. G枚bel</a>, <a href="/search/nucl-ex?searchtype=author&query=Golubeva%2C+M">M. Golubeva</a>, <a href="/search/nucl-ex?searchtype=author&query=Gonz%C3%A1lez-D%C3%ADaz%2C+D">D. Gonz谩lez-D铆az</a>, <a href="/search/nucl-ex?searchtype=author&query=Guber%2C+F">F. Guber</a> , et al. (75 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1703.08398v1-abstract-short" style="display: inline;"> Baryon resonance production in proton-proton collisions at a kinetic beam energy of 1.25 GeV is investigated. The multi-differential data were measured by the HADES collaboration. Exclusive channels with one pion in the final state ($np蟺^{+}$ and $pp蟺^{0}$) were put to extended studies based on various observables in the framework of a one-pion exchange model and with solutions obtained within the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.08398v1-abstract-full').style.display = 'inline'; document.getElementById('1703.08398v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1703.08398v1-abstract-full" style="display: none;"> Baryon resonance production in proton-proton collisions at a kinetic beam energy of 1.25 GeV is investigated. The multi-differential data were measured by the HADES collaboration. Exclusive channels with one pion in the final state ($np蟺^{+}$ and $pp蟺^{0}$) were put to extended studies based on various observables in the framework of a one-pion exchange model and with solutions obtained within the framework of a partial wave analysis (PWA) of the Bonn-Gatchina group. The results of the PWA confirm the dominant contribution of the $螖$(1232), yet with a sizable impact of the $N$(1440) and non-resonant partial waves. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.08398v1-abstract-full').style.display = 'none'; document.getElementById('1703.08398v1-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 March, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">ACM Class:</span> J.2 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. A 51 (2015) 137 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1703.00433">arXiv:1703.00433</a> <span> [<a href="https://arxiv.org/pdf/1703.00433">pdf</a>, <a href="https://arxiv.org/format/1703.00433">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2017.05.045">10.1016/j.physletb.2017.05.045 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Photon beam asymmetry $危$ for $畏$ and $畏^\prime$ photoproduction from the proton </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Collins%2C+P">P. Collins</a>, <a href="/search/nucl-ex?searchtype=author&query=Ritchie%2C+B+G">B. G. Ritchie</a>, <a href="/search/nucl-ex?searchtype=author&query=Dugger%2C+M">M. Dugger</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=D%C3%B6ring%2C+M">M. D枚ring</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=R%C3%B6nchen%2C+D">D. R枚nchen</a>, <a href="/search/nucl-ex?searchtype=author&query=Sadasivan%2C+D">D. Sadasivan</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A">A. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikaria%2C+K+P">K. P. Adhikaria</a>, <a href="/search/nucl-ex?searchtype=author&query=Akbar%2C+Z">Z. Akbar</a>, <a href="/search/nucl-ex?searchtype=author&query=Amaryana%2C+M+J">M. J. Amaryana</a>, <a href="/search/nucl-ex?searchtype=author&query=Pereira%2C+S+A">S. Anefalos Pereira</a>, <a href="/search/nucl-ex?searchtype=author&query=Avakiana%2C+H">H. Avakiana</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+J">J. Ball</a>, <a href="/search/nucl-ex?searchtype=author&query=Balossino%2C+I">I. Balossino</a>, <a href="/search/nucl-ex?searchtype=author&query=Bashkanova%2C+M">M. Bashkanova</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Bisellik%2C+A+S">A. S. Bisellik</a>, <a href="/search/nucl-ex?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V+D">V. D. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+F+T">Frank Thanh Cao</a> , et al. (118 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1703.00433v1-abstract-short" style="display: inline;"> Measurements of the linearly-polarized photon beam asymmetry $危$ for photoproduction from the proton of $畏$ and $畏^\prime$ mesons are reported. A linearly-polarized tagged photon beam produced by coherent bremsstrahlung was incident on a cryogenic hydrogen target within the CEBAF Large Acceptance Spectrometer. Results are presented for the $纬p \to 畏p$ reaction for incident photon energies from 1.0… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.00433v1-abstract-full').style.display = 'inline'; document.getElementById('1703.00433v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1703.00433v1-abstract-full" style="display: none;"> Measurements of the linearly-polarized photon beam asymmetry $危$ for photoproduction from the proton of $畏$ and $畏^\prime$ mesons are reported. A linearly-polarized tagged photon beam produced by coherent bremsstrahlung was incident on a cryogenic hydrogen target within the CEBAF Large Acceptance Spectrometer. Results are presented for the $纬p \to 畏p$ reaction for incident photon energies from 1.070 to 1.876 GeV, and from 1.516 to 1.836 GeV for the $纬p \to 畏^\prime p$ reaction. For $纬p \to 畏p$, the data reported here considerably extend the range of measurements to higher energies, and are consistent with the few previously published measurements for this observable near threshold. For $纬p \to 畏^\prime p$, the results obtained are consistent with the few previously published measurements for this observable near threshold, but also greatly expand the incident photon energy coverage for that reaction. Initial analysis of the data reported here with the Bonn-Gatchina model strengthens the evidence for four nucleon resonances -- the $N(1895)1/2^-$, $N(1900)3/2^+$, $N(2100)1/2^+$ and $N(2120)3/2^-$ resonances -- which presently lack the "four-star" status in the current Particle Data Group compilation, providing examples of how these new measurements help refine models of the photoproduction process. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.00433v1-abstract-full').style.display = 'none'; document.getElementById('1703.00433v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 March, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1702.05385">arXiv:1702.05385</a> <span> [<a href="https://arxiv.org/pdf/1702.05385">pdf</a>, <a href="https://arxiv.org/ps/1702.05385">ps</a>, <a href="https://arxiv.org/format/1702.05385">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/10.1140/epja/i2017-12322-6">10.1140/epja/i2017-12322-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Study of the proton-proton collisions at 1683 MeV/c </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Ermakov%2C+K+N">K. N. Ermakov</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Rogachevsky%2C+O+V">O. V. Rogachevsky</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+V+V">V. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Sherman%2C+S+G">S. G. Sherman</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="1702.05385v2-abstract-short" style="display: inline;"> The new data on the elastic $pp$ and single pion production reaction $pp\to pn 蟺^{+}$ taken at the incident proton momentum 1683 MeV/c are presented. The data on the $pp\to pn 蟺^{+}$ reaction are compared with predictions from the OPE model. To extract contributions of the leading partial waves the single pion production data are analyzed in the framework of the event-by-event maximum likelihood m… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1702.05385v2-abstract-full').style.display = 'inline'; document.getElementById('1702.05385v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1702.05385v2-abstract-full" style="display: none;"> The new data on the elastic $pp$ and single pion production reaction $pp\to pn 蟺^{+}$ taken at the incident proton momentum 1683 MeV/c are presented. The data on the $pp\to pn 蟺^{+}$ reaction are compared with predictions from the OPE model. To extract contributions of the leading partial waves the single pion production data are analyzed in the framework of the event-by-event maximum likelihood method together with the data measured earlier. The analysis allows us to obtain the assessment with a better precision the contributions from different initial partial waves. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1702.05385v2-abstract-full').style.display = 'none'; document.getElementById('1702.05385v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 April, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 February, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 6 figures. Some corrections are made</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1701.06387">arXiv:1701.06387</a> <span> [<a href="https://arxiv.org/pdf/1701.06387">pdf</a>, <a href="https://arxiv.org/ps/1701.06387">ps</a>, <a href="https://arxiv.org/format/1701.06387">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.95.035211">10.1103/PhysRevC.95.035211 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Is there a narrow $N(1685)$? </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V">V. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Thoma%2C+U">U. Thoma</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="1701.06387v2-abstract-short" style="display: inline;"> The helicity-dependent observable $E$ for the reaction $纬d\to 畏n (p)$ with a spectator proton was recently measured by the A2 Collaboration at MAMI in Mainz. The data were interpreted as further evidence for a narrow resonance with spin and parity $J^P=1/2^+$ ($P_{11}$ wave). However, a full partial wave analysis without any narrow resonance leads to an excellent description of the data, imposing… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1701.06387v2-abstract-full').style.display = 'inline'; document.getElementById('1701.06387v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1701.06387v2-abstract-full" style="display: none;"> The helicity-dependent observable $E$ for the reaction $纬d\to 畏n (p)$ with a spectator proton was recently measured by the A2 Collaboration at MAMI in Mainz. The data were interpreted as further evidence for a narrow resonance with spin and parity $J^P=1/2^+$ ($P_{11}$ wave). However, a full partial wave analysis without any narrow resonance leads to an excellent description of the data, imposing a narrow resonance with the properties suggested by the A2 Collaboration leads to a significant deterioration of the fit quality: there is no need for a narrow resonance. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1701.06387v2-abstract-full').style.display = 'none'; document.getElementById('1701.06387v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 January, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 January, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">3 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 95, 035211 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1601.06092">arXiv:1601.06092</a> <span> [<a href="https://arxiv.org/pdf/1601.06092">pdf</a>, <a href="https://arxiv.org/ps/1601.06092">ps</a>, <a href="https://arxiv.org/format/1601.06092">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.2016.01.061">10.1016/j.physletb.2016.01.061 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> $N^{\bf *}$ decays to $N蠅$ from new data on $纬p\to 蠅p$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Denisenko%2C+I">I. Denisenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Crede%2C+V">V. Crede</a>, <a href="/search/nucl-ex?searchtype=author&query=Eberhardt%2C+H">H. Eberhardt</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Schmieden%2C+H">H. Schmieden</a>, <a href="/search/nucl-ex?searchtype=author&query=Thoma%2C+U">U. Thoma</a>, <a href="/search/nucl-ex?searchtype=author&query=Wilson%2C+A">A. Wilson</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="1601.06092v1-abstract-short" style="display: inline;"> Data on the reaction $纬p\to 蠅p$ with $蠅\to蟺^0纬$, taken with unpolarized or polarized beams in combination with an unpolarized or polarized proton-target, were analyzed within the Bonn-Gatchina (BnGa) partial wave analysis. Differential cross sections, several spin density matrix elements, the beam asymmetry $危$, the normalized helicity difference $E$, and the correlation $G$ between linear photon… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.06092v1-abstract-full').style.display = 'inline'; document.getElementById('1601.06092v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1601.06092v1-abstract-full" style="display: none;"> Data on the reaction $纬p\to 蠅p$ with $蠅\to蟺^0纬$, taken with unpolarized or polarized beams in combination with an unpolarized or polarized proton-target, were analyzed within the Bonn-Gatchina (BnGa) partial wave analysis. Differential cross sections, several spin density matrix elements, the beam asymmetry $危$, the normalized helicity difference $E$, and the correlation $G$ between linear photon and longitudinal target polarization were included in a large data base on pion and photo-induced reactions. The data on $蠅$ photoproduction are used to determine twelve $N^*\to N蠅$ branching ratios; most of these are determined for the first time. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.06092v1-abstract-full').style.display = 'none'; document.getElementById('1601.06092v1-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 January, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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">6 pages, 4 figures, 2 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1508.01483">arXiv:1508.01483</a> <span> [<a href="https://arxiv.org/pdf/1508.01483">pdf</a>, <a href="https://arxiv.org/ps/1508.01483">ps</a>, <a href="https://arxiv.org/format/1508.01483">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2015.08.011">10.1016/j.physletb.2015.08.011 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Photoproduction of 蠅 Mesons off the Proton </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Wilson%2C+A">A. Wilson</a>, <a href="/search/nucl-ex?searchtype=author&query=Crede%2C+V">V. Crede</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Bacelar%2C+J+C+S">J. C. S. Bacelar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bantes%2C+B">B. Bantes</a>, <a href="/search/nucl-ex?searchtype=author&query=Bartholomy%2C+O">O. Bartholomy</a>, <a href="/search/nucl-ex?searchtype=author&query=Bayadilov%2C+D">D. Bayadilov</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Beloglazov%2C+Y+A">Y. A. Beloglazov</a>, <a href="/search/nucl-ex?searchtype=author&query=Brinkmann%2C+K+T">K. T. Brinkmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Castelijns%2C+R">R. Castelijns</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutz%2C+H">H. Dutz</a>, <a href="/search/nucl-ex?searchtype=author&query=Elsner%2C+D">D. Elsner</a>, <a href="/search/nucl-ex?searchtype=author&query=Ewald%2C+R">R. Ewald</a>, <a href="/search/nucl-ex?searchtype=author&query=Frommberger%2C+F">F. Frommberger</a>, <a href="/search/nucl-ex?searchtype=author&query=Fuchs%2C+M">M. Fuchs</a>, <a href="/search/nucl-ex?searchtype=author&query=Funke%2C+C">Chr. Funke</a>, <a href="/search/nucl-ex?searchtype=author&query=Gregor%2C+R">R. Gregor</a>, <a href="/search/nucl-ex?searchtype=author&query=Gridnev%2C+A">A. Gridnev</a>, <a href="/search/nucl-ex?searchtype=author&query=Gutz%2C+E">E. Gutz</a>, <a href="/search/nucl-ex?searchtype=author&query=Hannappel%2C+J">J. Hannappel</a>, <a href="/search/nucl-ex?searchtype=author&query=Hillert%2C+W">W. Hillert</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoffmeister%2C+P">P. Hoffmeister</a>, <a href="/search/nucl-ex?searchtype=author&query=Horn%2C+I">I. Horn</a>, <a href="/search/nucl-ex?searchtype=author&query=Jaegle%2C+I">I. Jaegle</a> , et al. (40 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1508.01483v1-abstract-short" style="display: inline;"> The differential cross sections and unpolarized spin-density matrix elements for the reaction $纬p\to p蠅$ were measured using the CBELSA/TAPS experiment for initial photon energies ranging from the reaction threshold to 2.5 GeV. These observables were measured from the radiative decay of the $蠅$ meson, $蠅\to蟺^0纬$. The cross sections cover the full angular range and show the full extent of the $t$-c… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1508.01483v1-abstract-full').style.display = 'inline'; document.getElementById('1508.01483v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1508.01483v1-abstract-full" style="display: none;"> The differential cross sections and unpolarized spin-density matrix elements for the reaction $纬p\to p蠅$ were measured using the CBELSA/TAPS experiment for initial photon energies ranging from the reaction threshold to 2.5 GeV. These observables were measured from the radiative decay of the $蠅$ meson, $蠅\to蟺^0纬$. The cross sections cover the full angular range and show the full extent of the $t$-channel forward rise. The overall shape of the angular distributions in the differential cross sections and unpolarized spin-density matrix elements are in fair agreement with previous data. In addition, for the first time, a beam of linearly-polarized tagged photons in the energy range from 1150 MeV to 1650 MeV was used to extract polarized spin-density matrix elements. These data were included in the Bonn-Gatchina partial wave analysis (PWA). The dominant contribution to $蠅$ photoproduction near threshold was found to be the $3/2^+$ partial wave, which is primarily due to the sub-threshold $N(1720)\,3/2^+$ resonance. At higher energies, pomeron-exchange was found to dominate whereas $蟺$-exchange remained small. These $t$-channel contributions as well as further contributions from nucleon resonances were necessary to describe the entire dataset: the $1/2^-$, $3/2^-$, and $5/2^+$ partial waves were also found to contribute significantly. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1508.01483v1-abstract-full').style.display = 'none'; document.getElementById('1508.01483v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 August, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 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">8 pages, 5 figures, accepted for publication in Physics Letters 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/1507.02488">arXiv:1507.02488</a> <span> [<a href="https://arxiv.org/pdf/1507.02488">pdf</a>, <a href="https://arxiv.org/ps/1507.02488">ps</a>, <a href="https://arxiv.org/format/1507.02488">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epja/i2015-15095-x">10.1140/epja/i2015-15095-x <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High statistics study of the reaction $纬p\to p\;2蟺^0$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Sokhoyan%2C+V">V. Sokhoyan</a>, <a href="/search/nucl-ex?searchtype=author&query=Gutz%2C+E">E. Gutz</a>, <a href="/search/nucl-ex?searchtype=author&query=Crede%2C+V">V. Crede</a>, <a href="/search/nucl-ex?searchtype=author&query=van+Pee%2C+H">H. van Pee</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Bacelar%2C+J+C+S">J. C. S. Bacelar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bantes%2C+B">B. Bantes</a>, <a href="/search/nucl-ex?searchtype=author&query=Bartholomy%2C+O">O. Bartholomy</a>, <a href="/search/nucl-ex?searchtype=author&query=Bayadilov%2C+D">D. Bayadilov</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Beloglazov%2C+Y+A">Y. A. Beloglazov</a>, <a href="/search/nucl-ex?searchtype=author&query=Castelijns%2C+R">R. Castelijns</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutz%2C+H">H. Dutz</a>, <a href="/search/nucl-ex?searchtype=author&query=Elsner%2C+D">D. Elsner</a>, <a href="/search/nucl-ex?searchtype=author&query=Ewald%2C+R">R. Ewald</a>, <a href="/search/nucl-ex?searchtype=author&query=Frommberger%2C+F">F. Frommberger</a>, <a href="/search/nucl-ex?searchtype=author&query=Fuchs%2C+M">M. Fuchs</a>, <a href="/search/nucl-ex?searchtype=author&query=Funke%2C+C">Ch. Funke</a>, <a href="/search/nucl-ex?searchtype=author&query=Gregor%2C+R">R. Gregor</a>, <a href="/search/nucl-ex?searchtype=author&query=Gridnev%2C+A+B">A. B. Gridnev</a>, <a href="/search/nucl-ex?searchtype=author&query=Hillert%2C+W">W. Hillert</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoffmeister%2C+P">Ph. Hoffmeister</a>, <a href="/search/nucl-ex?searchtype=author&query=Horn%2C+I">I. Horn</a>, <a href="/search/nucl-ex?searchtype=author&query=Jaegle%2C+I">I. Jaegle</a>, <a href="/search/nucl-ex?searchtype=author&query=Junkersfeld%2C+J">J. Junkersfeld</a> , et al. (40 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1507.02488v2-abstract-short" style="display: inline;"> The photoproduction of 2$蟺^0$ mesons off protons was studied with the Crystal Barrel/TAPS experiment at the electron accelerator ELSA in Bonn. The energy of photons produced in a radiator was tagged in the energy range from 600\,MeV to 2.5\,GeV. Differential and total cross sections and $p蟺^0蟺^0$ Dalitz plots are presented. Part of the data was taken with a diamond radiator producing linearly pola… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1507.02488v2-abstract-full').style.display = 'inline'; document.getElementById('1507.02488v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1507.02488v2-abstract-full" style="display: none;"> The photoproduction of 2$蟺^0$ mesons off protons was studied with the Crystal Barrel/TAPS experiment at the electron accelerator ELSA in Bonn. The energy of photons produced in a radiator was tagged in the energy range from 600\,MeV to 2.5\,GeV. Differential and total cross sections and $p蟺^0蟺^0$ Dalitz plots are presented. Part of the data was taken with a diamond radiator producing linearly polarized photons, and beam asymmetries were derived. Properties of nucleon and $螖$ resonances contributing to the $p蟺^0蟺^0$ final state were determined within the BnGa partial wave analysis. The data presented here allow us to determine branching ratios of nucleon and $螖$ resonances for their decays into $p蟺^0蟺^0$ via several intermediate states. Most prominent are decays proceeding via $螖(1232)蟺$, $N(1440)1/2^+蟺$, $N(1520)3/2^-蟺$, $N(1680)5/2^+蟺$, but also $pf_0(500)$, $pf_0(980)$, and $pf_2(1270)$ contribute to the reaction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1507.02488v2-abstract-full').style.display = 'none'; document.getElementById('1507.02488v2-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 December, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 July, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">28 pages, 17 figures, 7 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1503.05774">arXiv:1503.05774</a> <span> [<a href="https://arxiv.org/pdf/1503.05774">pdf</a>, <a href="https://arxiv.org/format/1503.05774">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"> Evidence for $螖(2200)7/2^-$ from photoproduction and consequence for chiral-symmetry restoration at high mass </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V">V. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Hartmann%2C+J">J. Hartmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Pasyuk%2C+E">E. Pasyuk</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Strauch%2C+S">S. Strauch</a>, <a href="/search/nucl-ex?searchtype=author&query=Thoma%2C+U">U. Thoma</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="1503.05774v2-abstract-short" style="display: inline;"> We report a partial-wave analysis of new data on the double-polarization variable $E$ for the reactions $纬p\to 蟺^+ n$ and $纬p\to 蟺^0 p$ and of further data published earlier. The analysis within the Bonn-Gatchina (BnGa) formalism reveals evidence for a poorly known baryon resonance, the one-star $螖(2200)7/2^-$. This is the lowest-mass $螖^*$ resonance with spin-parity $J^P=7/2^-$. Its mass is signi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1503.05774v2-abstract-full').style.display = 'inline'; document.getElementById('1503.05774v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1503.05774v2-abstract-full" style="display: none;"> We report a partial-wave analysis of new data on the double-polarization variable $E$ for the reactions $纬p\to 蟺^+ n$ and $纬p\to 蟺^0 p$ and of further data published earlier. The analysis within the Bonn-Gatchina (BnGa) formalism reveals evidence for a poorly known baryon resonance, the one-star $螖(2200)7/2^-$. This is the lowest-mass $螖^*$ resonance with spin-parity $J^P=7/2^-$. Its mass is significantly higher than the mass of its parity partner $螖(1950)7/2^+$ which is the lowest-mass $螖^*$ resonance with spin-parity $J^P=7/2^+$. It has been suggested that chiral symmetry might be restored in the high-mass region of hadron excitations, and that these two resonances should be degenerate in mass. Our findings are in conflict with this prediction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1503.05774v2-abstract-full').style.display = 'none'; document.getElementById('1503.05774v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 February, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 March, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">5 pages, 3 figures; Physics Letters B 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/1503.05163">arXiv:1503.05163</a> <span> [<a href="https://arxiv.org/pdf/1503.05163">pdf</a>, <a href="https://arxiv.org/format/1503.05163">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2015.08.053">10.1016/j.physletb.2015.08.053 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First Measurement of the Polarization Observable E in the $\vec p(\vec 纬,蟺^+)n$ Reaction up to 2.25 GeV </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Strauch%2C+S">S. Strauch</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=D%C3%B6ring%2C+M">M. D枚ring</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Pasyuk%2C+E">E. Pasyuk</a>, <a href="/search/nucl-ex?searchtype=author&query=R%C3%B6nchen%2C+D">D. R枚nchen</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Strakovsky%2C+I">I. Strakovsky</a>, <a href="/search/nucl-ex?searchtype=author&query=Workman%2C+R">R. Workman</a>, <a href="/search/nucl-ex?searchtype=author&query=Adhikari%2C+K+P">K. P. Adhikari</a>, <a href="/search/nucl-ex?searchtype=author&query=Adikaram%2C+D">D. Adikaram</a>, <a href="/search/nucl-ex?searchtype=author&query=Anderson%2C+M+D">M. D. Anderson</a>, <a href="/search/nucl-ex?searchtype=author&query=Pereira%2C+S+A">S. Anefalos Pereira</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Badui%2C+R+A">R. A. Badui</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+J">J. Ball</a>, <a href="/search/nucl-ex?searchtype=author&query=Batourine%2C+V">V. Batourine</a>, <a href="/search/nucl-ex?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/nucl-ex?searchtype=author&query=Benmouna%2C+N">N. Benmouna</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=Brock%2C+J">J. Brock</a>, <a href="/search/nucl-ex?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V+D">V. D. Burkert</a> , et al. (143 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="1503.05163v1-abstract-short" style="display: inline;"> First results from the longitudinally polarized frozen-spin target (FROST) program are reported. The double-polarization observable E, for the reaction $\vec 纬\vec p \to 蟺^+n$, has been measured using a circularly polarized tagged-photon beam, with energies from 0.35 to 2.37 GeV. The final-state pions were detected with the CEBAF Large Acceptance Spectrometer in Hall B at the Thomas Jefferson Nati… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1503.05163v1-abstract-full').style.display = 'inline'; document.getElementById('1503.05163v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1503.05163v1-abstract-full" style="display: none;"> First results from the longitudinally polarized frozen-spin target (FROST) program are reported. The double-polarization observable E, for the reaction $\vec 纬\vec p \to 蟺^+n$, has been measured using a circularly polarized tagged-photon beam, with energies from 0.35 to 2.37 GeV. The final-state pions were detected with the CEBAF Large Acceptance Spectrometer in Hall B at the Thomas Jefferson National Accelerator Facility. These polarization data agree fairly well with previous partial-wave analyses at low photon energies. Over much of the covered energy range, however, significant deviations are observed, particularly in the high-energy region where high-L multipoles contribute. The data have been included in new multipole analyses resulting in updated nucleon resonance parameters. We report updated fits from the Bonn-Gatchina, J眉lich, and SAID groups. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1503.05163v1-abstract-full').style.display = 'none'; document.getElementById('1503.05163v1-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 March, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">6 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1501.02093">arXiv:1501.02093</a> <span> [<a href="https://arxiv.org/pdf/1501.02093">pdf</a>, <a href="https://arxiv.org/ps/1501.02093">ps</a>, <a href="https://arxiv.org/format/1501.02093">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"> Interference phenomena in the $J^P=1/2^-$-wave in $畏$ photoproduction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Krusche%2C+B">B. Krusche</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Thoma%2C+U">U. Thoma</a>, <a href="/search/nucl-ex?searchtype=author&query=Werthm%C3%BCller%2C+D">D. Werthm眉ller</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="1501.02093v2-abstract-short" style="display: inline;"> The recent precise experimental results for the photoproduction of $畏$-mesons off the neutron measured with the Crystal Ball/TAPS calorimeter at the MAMI accelerator have been investigated in detail in the framework of the Bonn-Gatchina coupled channel model. The main result is that the narrow structure observed in the excitation function of $纬n \rightarrow n畏$ can be reproduced fully with a parti… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.02093v2-abstract-full').style.display = 'inline'; document.getElementById('1501.02093v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1501.02093v2-abstract-full" style="display: none;"> The recent precise experimental results for the photoproduction of $畏$-mesons off the neutron measured with the Crystal Ball/TAPS calorimeter at the MAMI accelerator have been investigated in detail in the framework of the Bonn-Gatchina coupled channel model. The main result is that the narrow structure observed in the excitation function of $纬n \rightarrow n畏$ can be reproduced fully with a particular interference pattern in the $J^P=1/2^-$ partial wave. Introduction of the narrow resonance $N(1685)$ with the properties reported in earlier publications deteriorates the quality of the fit. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.02093v2-abstract-full').style.display = 'none'; document.getElementById('1501.02093v2-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 June, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 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">10 pages, 13 figures, accepted for publication in EPJA</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1405.2729">arXiv:1405.2729</a> <span> [<a href="https://arxiv.org/pdf/1405.2729">pdf</a>, <a href="https://arxiv.org/ps/1405.2729">ps</a>, <a href="https://arxiv.org/format/1405.2729">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.2014.09.039">10.1016/j.physletb.2014.09.039 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of polarisation observables in $K^0_s危^+$ photoproduction off the proton </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Ewald%2C+R">R. Ewald</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Bantes%2C+B">B. Bantes</a>, <a href="/search/nucl-ex?searchtype=author&query=Bartholomy%2C+O">O. Bartholomy</a>, <a href="/search/nucl-ex?searchtype=author&query=Bayadilov%2C+D">D. Bayadilov</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Beloglazov%2C+Y+A">Y. A. Beloglazov</a>, <a href="/search/nucl-ex?searchtype=author&query=Brinkmann%2C+K+-">K. -T. Brinkmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Crede%2C+V">V. Crede</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutz%2C+H">H. Dutz</a>, <a href="/search/nucl-ex?searchtype=author&query=Elsner%2C+D">D. Elsner</a>, <a href="/search/nucl-ex?searchtype=author&query=Fornet-Ponse%2C+K">K. Fornet-Ponse</a>, <a href="/search/nucl-ex?searchtype=author&query=Frommberger%2C+F">F. Frommberger</a>, <a href="/search/nucl-ex?searchtype=author&query=Funke%2C+C">Ch. Funke</a>, <a href="/search/nucl-ex?searchtype=author&query=Gridnev%2C+A+B">A. B. Gridnev</a>, <a href="/search/nucl-ex?searchtype=author&query=Gutz%2C+E">E. Gutz</a>, <a href="/search/nucl-ex?searchtype=author&query=Hannappel%2C+J">J. Hannappel</a>, <a href="/search/nucl-ex?searchtype=author&query=Hillert%2C+W">W. Hillert</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoffmeister%2C+P">P. Hoffmeister</a>, <a href="/search/nucl-ex?searchtype=author&query=Jaegle%2C+I">I. Jaegle</a>, <a href="/search/nucl-ex?searchtype=author&query=Jahn%2C+O">O. Jahn</a>, <a href="/search/nucl-ex?searchtype=author&query=Jude%2C+T+C">T. C Jude</a>, <a href="/search/nucl-ex?searchtype=author&query=Junkersfeld%2C+J">J. Junkersfeld</a>, <a href="/search/nucl-ex?searchtype=author&query=Kalinowsky%2C+H">H. Kalinowsky</a>, <a href="/search/nucl-ex?searchtype=author&query=Kammer%2C+S">S. Kammer</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="1405.2729v2-abstract-short" style="display: inline;"> The reaction $纬\, p \rightarrow K^0_S\,危^+$ is studied in the photon energy range from threshold. Linearly polarised photon beams from coherent bremsstrahlung enabled the first measurement of photon beam asymmetries in this reaction up to $E_纬= 2250$ MeV. In addition, the recoil hyperon polarisation was determined through the asymmetry in the weak decay $危^+ \rightarrow p 蟺^0$ up to $E_纬= 1650$ Me… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1405.2729v2-abstract-full').style.display = 'inline'; document.getElementById('1405.2729v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1405.2729v2-abstract-full" style="display: none;"> The reaction $纬\, p \rightarrow K^0_S\,危^+$ is studied in the photon energy range from threshold. Linearly polarised photon beams from coherent bremsstrahlung enabled the first measurement of photon beam asymmetries in this reaction up to $E_纬= 2250$ MeV. In addition, the recoil hyperon polarisation was determined through the asymmetry in the weak decay $危^+ \rightarrow p 蟺^0$ up to $E_纬= 1650$ MeV. The data are compared to partial wave analyses, and the possible impact on the interpretation of a recently observed cusp-like structure near the $K^*$ thresholds is discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1405.2729v2-abstract-full').style.display = 'none'; document.getElementById('1405.2729v2-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 May, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 May, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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, 5 figures. References [8,9,10,11] which were not on the original submission are now included</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1404.4587">arXiv:1404.4587</a> <span> [<a href="https://arxiv.org/pdf/1404.4587">pdf</a>, <a href="https://arxiv.org/ps/1404.4587">ps</a>, <a href="https://arxiv.org/format/1404.4587">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/10.1140/epja/i2014-14129-3">10.1140/epja/i2014-14129-3 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Energy-independent PWA of the reaction $纬p\to K^+螞$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V">V. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=McCracken%2C+M+E">M. E. McCracken</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Schumacher%2C+R+A">R. A. Schumacher</a>, <a href="/search/nucl-ex?searchtype=author&query=Thoma%2C+U">U. Thoma</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="1404.4587v1-abstract-short" style="display: inline;"> Using all recent data on the differential cross sections and spin observables for the reaction $纬p \to K^+ 螞$, an energy-independent partial-wave analysis is performed. The analysis requires multipoles up to $L = 2$; there is no evidence that the fit requires multipoles with $L=3$. At present the available data allow us to extract the dominant multipoles only. These are compatible with the multipo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1404.4587v1-abstract-full').style.display = 'inline'; document.getElementById('1404.4587v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1404.4587v1-abstract-full" style="display: none;"> Using all recent data on the differential cross sections and spin observables for the reaction $纬p \to K^+ 螞$, an energy-independent partial-wave analysis is performed. The analysis requires multipoles up to $L = 2$; there is no evidence that the fit requires multipoles with $L=3$. At present the available data allow us to extract the dominant multipoles only. These are compatible with the multipoles obtained in the energy-dependent fit. This result supports the reliability of the Bonn-Gatchina energy-dependent results. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1404.4587v1-abstract-full').style.display = 'none'; document.getElementById('1404.4587v1-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 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">9 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1402.7164">arXiv:1402.7164</a> <span> [<a href="https://arxiv.org/pdf/1402.7164">pdf</a>, <a href="https://arxiv.org/ps/1402.7164">ps</a>, <a href="https://arxiv.org/format/1402.7164">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"> Comment on "Narrow Structure in the Excitation Function of $畏$\ Photoproduction off the Neutron" </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Thoma%2C+U">U. Thoma</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="1402.7164v1-abstract-short" style="display: inline;"> It is shown that the narrow structure observed in the excitation function of $畏$ photoproduction off the Neutron originates from the interference of the two $S_{11}$ resonances. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1402.7164v1-abstract-full" style="display: none;"> It is shown that the narrow structure observed in the excitation function of $畏$ photoproduction off the Neutron originates from the interference of the two $S_{11}$ resonances. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1402.7164v1-abstract-full').style.display = 'none'; document.getElementById('1402.7164v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 February, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">1 page, 2 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/1310.3610">arXiv:1310.3610</a> <span> [<a href="https://arxiv.org/pdf/1310.3610">pdf</a>, <a href="https://arxiv.org/ps/1310.3610">ps</a>, <a href="https://arxiv.org/format/1310.3610">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/10.1140/epja/i2013-13158-8">10.1140/epja/i2013-13158-8 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Sign ambiguity in the K Sigma channel </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Thoma%2C+U">U. Thoma</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="1310.3610v1-abstract-short" style="display: inline;"> Ambiguities of the signs of $N\to 危K$ coupling constants are studied in a multichannel partial wave analysis of a large body of pion and photo-induced reactions. It is shown that the signs are not free from some ambiguities, and further experimental data are needed. Data on the reactions $蟺^+p\to 危^+K^+$ and $纬p\to K^+危^0$ define rather well the isospin 3/2 contributions to these channels. However… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1310.3610v1-abstract-full').style.display = 'inline'; document.getElementById('1310.3610v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1310.3610v1-abstract-full" style="display: none;"> Ambiguities of the signs of $N\to 危K$ coupling constants are studied in a multichannel partial wave analysis of a large body of pion and photo-induced reactions. It is shown that the signs are not free from some ambiguities, and further experimental data are needed. Data on the reactions $蟺^+p\to 危^+K^+$ and $纬p\to K^+危^0$ define rather well the isospin 3/2 contributions to these channels. However the lack of information on polarization observables for the reactions $蟺^-p\to 危^0K^0$, $蟺^-p\to 危^-K^+$ and $纬p\to K^0危^+$ does not allow us to fix uniquely the signs of $N\to 危K$ coupling constants. As a consequence, also the contributions of nucleon resonances to these channels remain uncertain. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1310.3610v1-abstract-full').style.display = 'none'; document.getElementById('1310.3610v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 October, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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, 12 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/1308.5659">arXiv:1308.5659</a> <span> [<a href="https://arxiv.org/pdf/1308.5659">pdf</a>, <a href="https://arxiv.org/format/1308.5659">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.2014.06.015">10.1016/j.physletb.2014.06.015 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> $K^+螞$ and $K^+危^0$ photoproduction with fine center-of-mass energy resolution </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Jude%2C+T+C">T. C. Jude</a>, <a href="/search/nucl-ex?searchtype=author&query=Glazier%2C+D+I">D. I. Glazier</a>, <a href="/search/nucl-ex?searchtype=author&query=Watts%2C+D+P">D. P. Watts</a>, <a href="/search/nucl-ex?searchtype=author&query=Aguar-Bartolome%2C+P">P. Aguar-Bartolome</a>, <a href="/search/nucl-ex?searchtype=author&query=Akasoy%2C+L+K">L. K. Akasoy</a>, <a href="/search/nucl-ex?searchtype=author&query=Annand%2C+J+R+M">J. R. M. Annand</a>, <a href="/search/nucl-ex?searchtype=author&query=Arends%2C+H+J">H. J. Arends</a>, <a href="/search/nucl-ex?searchtype=author&query=Bantawa%2C+K">K. Bantawa</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Bekrenev%2C+V+S">V. S. Bekrenev</a>, <a href="/search/nucl-ex?searchtype=author&query=Berghauser%2C+H">H. Berghauser</a>, <a href="/search/nucl-ex?searchtype=author&query=Braghieri%2C+A">A. Braghieri</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=Brudvik%2C+J">J. Brudvik</a>, <a href="/search/nucl-ex?searchtype=author&query=Cherepnya%2C+S">S. Cherepnya</a>, <a href="/search/nucl-ex?searchtype=author&query=Demissie%2C+B+T">B. T. Demissie</a>, <a href="/search/nucl-ex?searchtype=author&query=Dieterle%2C+M">M. Dieterle</a>, <a href="/search/nucl-ex?searchtype=author&query=Downie%2C+E+J">E. J. Downie</a>, <a href="/search/nucl-ex?searchtype=author&query=Fil%27kov%2C+L+V">L. V. Fil'kov</a>, <a href="/search/nucl-ex?searchtype=author&query=Gregor%2C+R">R. Gregor</a>, <a href="/search/nucl-ex?searchtype=author&query=Heid%2C+E">E. Heid</a>, <a href="/search/nucl-ex?searchtype=author&query=Hornidge%2C+D">D. Hornidge</a>, <a href="/search/nucl-ex?searchtype=author&query=Jaegle%2C+I">I. Jaegle</a>, <a href="/search/nucl-ex?searchtype=author&query=Jahn%2C+O">O. Jahn</a> , et al. (47 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="1308.5659v3-abstract-short" style="display: inline;"> Measurements of $纬p \rightarrow K^{+} 螞$ and $纬p \rightarrow K^{+} 危^0$ cross-sections have been obtained with the photon tagging facility and the Crystal Ball calorimeter at MAMI-C. The measurement uses a novel $K^+$ meson identification technique in which the weak decay products are characterized using the energy and timing characteristics of the energy deposit in the calorimeter, a method that… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1308.5659v3-abstract-full').style.display = 'inline'; document.getElementById('1308.5659v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1308.5659v3-abstract-full" style="display: none;"> Measurements of $纬p \rightarrow K^{+} 螞$ and $纬p \rightarrow K^{+} 危^0$ cross-sections have been obtained with the photon tagging facility and the Crystal Ball calorimeter at MAMI-C. The measurement uses a novel $K^+$ meson identification technique in which the weak decay products are characterized using the energy and timing characteristics of the energy deposit in the calorimeter, a method that has the potential to be applied at many other facilities. The fine center-of-mass energy ($W$) resolution and statistical accuracy of the new data results in a significant impact on partial wave analyses aiming to better establish the excitation spectrum of the nucleon. The new analyses disfavor a strong role for quark-diquark dynamics in the nucleon. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1308.5659v3-abstract-full').style.display = 'none'; document.getElementById('1308.5659v3-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 July, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 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">7 pages, 8 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1304.2177">arXiv:1304.2177</a> <span> [<a href="https://arxiv.org/pdf/1304.2177">pdf</a>, <a href="https://arxiv.org/ps/1304.2177">ps</a>, <a href="https://arxiv.org/format/1304.2177">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epja/i2013-13067-x">10.1140/epja/i2013-13067-x <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Helicity amplitudes for photoexcitation of nucleon resonances off neutrons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Burkert%2C+V">V. Burkert</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Thoma%2C+U">U. Thoma</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="1304.2177v1-abstract-short" style="display: inline;"> The helicity amplitudes $A^{1/2}_n$ and $A^{3/2}_n$ for the photoexcitation of nucleon resonances off neutrons are determined in a multi-channel partial-wave analysis. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1304.2177v1-abstract-full" style="display: none;"> The helicity amplitudes $A^{1/2}_n$ and $A^{3/2}_n$ for the photoexcitation of nucleon resonances off neutrons are determined in a multi-channel partial-wave analysis. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1304.2177v1-abstract-full').style.display = 'none'; document.getElementById('1304.2177v1-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 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">submitted to EPJ A</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1112.0811">arXiv:1112.0811</a> <span> [<a href="https://arxiv.org/pdf/1112.0811">pdf</a>, <a href="https://arxiv.org/format/1112.0811">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.2012.05.066">10.1016/j.physletb.2012.05.066 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Anomaly in the K^0_S Sigma^+ photoproduction cross section off the proton at the K* threshold </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Ewald%2C+R">R. Ewald</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Bantes%2C+B">B. Bantes</a>, <a href="/search/nucl-ex?searchtype=author&query=Bartholomy%2C+O">O. Bartholomy</a>, <a href="/search/nucl-ex?searchtype=author&query=Bayadilov%2C+D">D. Bayadilov</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Beloglazov%2C+Y+A">Y. A. Beloglazov</a>, <a href="/search/nucl-ex?searchtype=author&query=Brinkmann%2C+K+-">K. -T. Brinkmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Crede%2C+V">V. Crede</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutz%2C+H">H. Dutz</a>, <a href="/search/nucl-ex?searchtype=author&query=Elsner%2C+D">D. Elsner</a>, <a href="/search/nucl-ex?searchtype=author&query=Fornet-Ponse%2C+K">K. Fornet-Ponse</a>, <a href="/search/nucl-ex?searchtype=author&query=Frommberger%2C+F">F. Frommberger</a>, <a href="/search/nucl-ex?searchtype=author&query=Funke%2C+C">Ch. Funke</a>, <a href="/search/nucl-ex?searchtype=author&query=Gridnev%2C+A+B">A. B. Gridnev</a>, <a href="/search/nucl-ex?searchtype=author&query=Gutz%2C+E">E. Gutz</a>, <a href="/search/nucl-ex?searchtype=author&query=Hillert%2C+W">W. Hillert</a>, <a href="/search/nucl-ex?searchtype=author&query=Hannappel%2C+J">J. Hannappel</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoffmeister%2C+P">P. Hoffmeister</a>, <a href="/search/nucl-ex?searchtype=author&query=Jaegle%2C+I">I. Jaegle</a>, <a href="/search/nucl-ex?searchtype=author&query=Jahn%2C+O">O. Jahn</a>, <a href="/search/nucl-ex?searchtype=author&query=Jude%2C+T">T. Jude</a>, <a href="/search/nucl-ex?searchtype=author&query=Junkersfeld%2C+J">J. Junkersfeld</a>, <a href="/search/nucl-ex?searchtype=author&query=Kalinowsky%2C+H">H. Kalinowsky</a>, <a href="/search/nucl-ex?searchtype=author&query=Kammer%2C+S">S. Kammer</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="1112.0811v1-abstract-short" style="display: inline;"> The $纬+ p \rightarrow K^0 + 危^+$ photoproduction reaction is investigated in the energy region from threshold to $E_纬= 2250$\,MeV. The differential cross section exhibits increasing forward-peaking with energy, but only up to the $K^*$ threshold. Beyond, it suddenly returns to a flat distribution with the forward cross section dropping by a factor of four. In the total cross section a pronounced s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1112.0811v1-abstract-full').style.display = 'inline'; document.getElementById('1112.0811v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1112.0811v1-abstract-full" style="display: none;"> The $纬+ p \rightarrow K^0 + 危^+$ photoproduction reaction is investigated in the energy region from threshold to $E_纬= 2250$\,MeV. The differential cross section exhibits increasing forward-peaking with energy, but only up to the $K^*$ threshold. Beyond, it suddenly returns to a flat distribution with the forward cross section dropping by a factor of four. In the total cross section a pronounced structure is observed between the $K^*螞$ and $K^*危$ thresholds. It is speculated whether this signals the turnover of the reaction mechanism from t-channel exchange below the $K^*$ production threshold to an s-channel mechanism associated with the formation of a dynamically generated $K^*$-hyperon intermediate state. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1112.0811v1-abstract-full').style.display = 'none'; document.getElementById('1112.0811v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 December, 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">14 pages, 7 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/1111.6151">arXiv:1111.6151</a> <span> [<a href="https://arxiv.org/pdf/1111.6151">pdf</a>, <a href="https://arxiv.org/ps/1111.6151">ps</a>, <a href="https://arxiv.org/format/1111.6151">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2012.03.077">10.1016/j.physletb.2012.03.077 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Evidence for a negative-parity spin-doublet of nucleon resonances at 1.88\,GeV </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Schmieden%2C+H">H. Schmieden</a>, <a href="/search/nucl-ex?searchtype=author&query=Thoma%2C+U">U. Thoma</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="1111.6151v2-abstract-short" style="display: inline;"> Evidence is reported for two nucleon resonances with spin-parity $J^P=1/2^-$ and $J^P=3/2^-$ at a mass just below 1.9\,GeV. The evidence is derived from a coupled-channel analysis of a large number of pion and photo-produced reactions. The two resonances are nearly degenerate in mass with two resonances of the same spin but positive parity. Such parity doublets are predicted in models claiming res… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1111.6151v2-abstract-full').style.display = 'inline'; document.getElementById('1111.6151v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1111.6151v2-abstract-full" style="display: none;"> Evidence is reported for two nucleon resonances with spin-parity $J^P=1/2^-$ and $J^P=3/2^-$ at a mass just below 1.9\,GeV. The evidence is derived from a coupled-channel analysis of a large number of pion and photo-produced reactions. The two resonances are nearly degenerate in mass with two resonances of the same spin but positive parity. Such parity doublets are predicted in models claiming restoration of chiral symmetry in high-mass excitations of the nucleon. Further examples of spin parity doublets are found in addition. Alternatively, the spin doublet can be interpreted as member of the 56-plet expected in the third excitation band of the nucleon. Implications for the problem of the {\it missing resonances} are discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1111.6151v2-abstract-full').style.display = 'none'; document.getElementById('1111.6151v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 December, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 November, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">10 pages, 3 figures, 4 tables, minor revision</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1108.3010">arXiv:1108.3010</a> <span> [<a href="https://arxiv.org/pdf/1108.3010">pdf</a>, <a href="https://arxiv.org/ps/1108.3010">ps</a>, <a href="https://arxiv.org/format/1108.3010">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> </div> <p class="title is-5 mathjax"> Search for Narrow Nucleon Resonance in $纬p\to 畏p$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Klempt%2C+E">E. Klempt</a>, <a href="/search/nucl-ex?searchtype=author&query=Kuznetsov%2C+V">V. Kuznetsov</a>, <a href="/search/nucl-ex?searchtype=author&query=Nikonov%2C+V+A">V. A. Nikonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Polyakov%2C+M+V">M. V. Polyakov</a>, <a href="/search/nucl-ex?searchtype=author&query=Sarantsev%2C+A+V">A. V. Sarantsev</a>, <a href="/search/nucl-ex?searchtype=author&query=Thoma%2C+U">U. Thoma</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="1108.3010v2-abstract-short" style="display: inline;"> Results of a partial wave analysis of new high-statistics data on $纬p\to p畏$ from MAMI are presented. A fit using known broad resonances and only standard background amplitudes can not describe the relatively narrow peaking structure in the cross section in the mass region of 1660-1750 MeV which follows a minimum. An improved description of the data can be reached by either assuming the existence… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1108.3010v2-abstract-full').style.display = 'inline'; document.getElementById('1108.3010v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1108.3010v2-abstract-full" style="display: none;"> Results of a partial wave analysis of new high-statistics data on $纬p\to p畏$ from MAMI are presented. A fit using known broad resonances and only standard background amplitudes can not describe the relatively narrow peaking structure in the cross section in the mass region of 1660-1750 MeV which follows a minimum. An improved description of the data can be reached by either assuming the existence of a narrow resonance at a mass of about 1700 MeV with small photo-coupling or by a threshold effect. In the latter case the observed structure is explained by a strong (resonant or non-resonant) $纬p\to蠅p$ coupling in the $S_{11}$ partial wave. When the beam asymmetry data, published by part of the GRAAL collaboration, are included in the fit, the solution with a narrow $P_{11}$ state is slightly preferred. In that fit, mass and width of the hypothetical resonance are determined to $M\sim$1694 MeV and $螕\sim 40$ MeV, respectively, and the photo-coupling to $\sqrt{{\rm Br}_{畏N}} A_{1/2}^p \sim 2.6\cdot 10^{-3}$ GeV$^{-1/2}$. High precision measurements of the target asymmetry and $F$-observable are mandatory to establish the possible existence of such a narrow state and to provide the necessary information to define which partial wave is responsible for the structure observed in the data. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1108.3010v2-abstract-full').style.display = 'none'; document.getElementById('1108.3010v2-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 September, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 August, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 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">6 pages, 5 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1107.2151">arXiv:1107.2151</a> <span> [<a href="https://arxiv.org/pdf/1107.2151">pdf</a>, <a href="https://arxiv.org/ps/1107.2151">ps</a>, <a href="https://arxiv.org/format/1107.2151">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.84.055203">10.1103/PhysRevC.84.055203 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Photoproduction of Neutral Pions off Protons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Collaboration%2C+T+C">The CBELSA/TAPS Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/nucl-ex?searchtype=author&query=Crede%2C+V">V. Crede</a>, <a href="/search/nucl-ex?searchtype=author&query=Sparks%2C+N">N. Sparks</a>, <a href="/search/nucl-ex?searchtype=author&query=Wilson%2C+A">A. Wilson</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Bacelar%2C+J+C+S">J. C. S. Bacelar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bantes%2C+R">R. Bantes</a>, <a href="/search/nucl-ex?searchtype=author&query=Bartholomy%2C+O">O. Bartholomy</a>, <a href="/search/nucl-ex?searchtype=author&query=Bayadilov%2C+D">D. Bayadilov</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Beloglazov%2C+Y+A">Y. A. Beloglazov</a>, <a href="/search/nucl-ex?searchtype=author&query=Castelijns%2C+R">R. Castelijns</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutz%2C+H">H. Dutz</a>, <a href="/search/nucl-ex?searchtype=author&query=Elsner%2C+D">D. Elsner</a>, <a href="/search/nucl-ex?searchtype=author&query=Ewald%2C+R">R. Ewald</a>, <a href="/search/nucl-ex?searchtype=author&query=Frommberger%2C+F">F. Frommberger</a>, <a href="/search/nucl-ex?searchtype=author&query=Funke%2C+C">Chr. Funke</a>, <a href="/search/nucl-ex?searchtype=author&query=Gregor%2C+R">R. Gregor</a>, <a href="/search/nucl-ex?searchtype=author&query=Gridnev%2C+A">A. Gridnev</a>, <a href="/search/nucl-ex?searchtype=author&query=Gutz%2C+E">E. Gutz</a>, <a href="/search/nucl-ex?searchtype=author&query=Hillert%2C+W">W. Hillert</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoffmeister%2C+P">P. Hoffmeister</a>, <a href="/search/nucl-ex?searchtype=author&query=Jaegle%2C+I">I. Jaegle</a>, <a href="/search/nucl-ex?searchtype=author&query=Junkersfeld%2C+J">J. Junkersfeld</a> , et al. (38 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1107.2151v2-abstract-short" style="display: inline;"> Photoproduction of neutral pions has been studied with the CBELSA/TAPS detector in the reaction $纬p\to p蟺^0$ for photon energies between 0.85 and 2.50 GeV. The $蟺^0$ mesons are observed in their dominant neutral decay mode: $蟺^0\to纬纬$. For the first time, the differential cross sections cover the very forward region, $胃_{\rm c.m.}<60^\circ$. A partial-wave analysis of these data within the Bonn-Ga… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.2151v2-abstract-full').style.display = 'inline'; document.getElementById('1107.2151v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1107.2151v2-abstract-full" style="display: none;"> Photoproduction of neutral pions has been studied with the CBELSA/TAPS detector in the reaction $纬p\to p蟺^0$ for photon energies between 0.85 and 2.50 GeV. The $蟺^0$ mesons are observed in their dominant neutral decay mode: $蟺^0\to纬纬$. For the first time, the differential cross sections cover the very forward region, $胃_{\rm c.m.}<60^\circ$. A partial-wave analysis of these data within the Bonn-Gatchina framework observes the high-mass resonances $G_{17}$(2190), $D_{13}$(2080), and $D_{15}$(2070). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.2151v2-abstract-full').style.display = 'none'; document.getElementById('1107.2151v2-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 November, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 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">12 pages, 9 figures, minor modifications to PWA section</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 84, 055203 (2011) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1107.2046">arXiv:1107.2046</a> <span> [<a href="https://arxiv.org/pdf/1107.2046">pdf</a>, <a href="https://arxiv.org/ps/1107.2046">ps</a>, <a href="https://arxiv.org/format/1107.2046">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epja/i2011-11089-0">10.1140/epja/i2011-11089-0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quasi-free photoproduction of eta-mesons off the deuteron </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Jaegle%2C+I">I. Jaegle</a>, <a href="/search/nucl-ex?searchtype=author&query=Krusche%2C+B">B. Krusche</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Bacelar%2C+J+C+S">J. C. S. Bacelar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bantes%2C+B">B. Bantes</a>, <a href="/search/nucl-ex?searchtype=author&query=Bartholomy%2C+O">O. Bartholomy</a>, <a href="/search/nucl-ex?searchtype=author&query=Bayadilov%2C+D+E">D. E. Bayadilov</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Beloglazov%2C+Y+A">Y. A. Beloglazov</a>, <a href="/search/nucl-ex?searchtype=author&query=Castelijns%2C+R">R. Castelijns</a>, <a href="/search/nucl-ex?searchtype=author&query=Crede%2C+V">V. Crede</a>, <a href="/search/nucl-ex?searchtype=author&query=Dieterle%2C+M">M. Dieterle</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutz%2C+H">H. Dutz</a>, <a href="/search/nucl-ex?searchtype=author&query=Elsner%2C+D">D. Elsner</a>, <a href="/search/nucl-ex?searchtype=author&query=Ewald%2C+R">R. Ewald</a>, <a href="/search/nucl-ex?searchtype=author&query=Frommberger%2C+F">F. Frommberger</a>, <a href="/search/nucl-ex?searchtype=author&query=Funke%2C+C">C. Funke</a>, <a href="/search/nucl-ex?searchtype=author&query=Gothe%2C+R">R. Gothe</a>, <a href="/search/nucl-ex?searchtype=author&query=Gregor%2C+R">R. Gregor</a>, <a href="/search/nucl-ex?searchtype=author&query=Gridnev%2C+A+B">A. B. Gridnev</a>, <a href="/search/nucl-ex?searchtype=author&query=Gutz%2C+E">E. Gutz</a>, <a href="/search/nucl-ex?searchtype=author&query=Hillert%2C+W">W. Hillert</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoeffgen%2C+S">S. Hoeffgen</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoffmeister%2C+P">P. Hoffmeister</a>, <a href="/search/nucl-ex?searchtype=author&query=Horn%2C+I">I. Horn</a> , et al. (47 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="1107.2046v1-abstract-short" style="display: inline;"> Precise data for quasi-free photoproduction of $畏$ mesons off the deuteron have been measured at the Bonn ELSA accelerator with the combined Crystal Barrel/TAPS detector for incident photon energies up to 2.5 GeV. The $畏$-mesons have been detected in coincidence with recoil protons and neutrons. Possible nuclear effects like Fermi motion and re-scattering can be studied via a comparison of the qua… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.2046v1-abstract-full').style.display = 'inline'; document.getElementById('1107.2046v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1107.2046v1-abstract-full" style="display: none;"> Precise data for quasi-free photoproduction of $畏$ mesons off the deuteron have been measured at the Bonn ELSA accelerator with the combined Crystal Barrel/TAPS detector for incident photon energies up to 2.5 GeV. The $畏$-mesons have been detected in coincidence with recoil protons and neutrons. Possible nuclear effects like Fermi motion and re-scattering can be studied via a comparison of the quasi-free reaction off the bound proton to $畏$-production off the free proton. No significant effects beyond the folding of the free cross section with the momentum distribution of the bound protons have been found. These Fermi motion effects can be removed by an analysis using the invariant mass of the $畏$-nucleon pairs reconstructed from the final state four-momenta of the particles. The total cross section for quasi-free $畏$-photoproduction off the neutron reveals even without correction for Fermi motion a pronounced bump-like structure around 1 GeV of incident photon energy, which is not observed for the proton. This structure is even narrower in the invariant mass spectrum of the $畏$-neutron pairs. Position and width of the peak in the invariant mass spectrum are $W\approx 1665$ MeV and FWHM $螕\approx 25$ MeV. The data are compared to the results of different models. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.2046v1-abstract-full').style.display = 'none'; document.getElementById('1107.2046v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 July, 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">accepted for publication in Eur. Phys. J. A</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1012.1021">arXiv:1012.1021</a> <span> [<a href="https://arxiv.org/pdf/1012.1021">pdf</a>, <a href="https://arxiv.org/ps/1012.1021">ps</a>, <a href="https://arxiv.org/format/1012.1021">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epja/i2011-11011-x">10.1140/epja/i2011-11011-x <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Photoproduction of $畏'$-mesons off the deuteron </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Jaegle%2C+I">I. Jaegle</a>, <a href="/search/nucl-ex?searchtype=author&query=Mertens%2C+T">T. Mertens</a>, <a href="/search/nucl-ex?searchtype=author&query=Fix%2C+A">A. Fix</a>, <a href="/search/nucl-ex?searchtype=author&query=Huang%2C+F">F. Huang</a>, <a href="/search/nucl-ex?searchtype=author&query=Nakayama%2C+K">K. Nakayama</a>, <a href="/search/nucl-ex?searchtype=author&query=Tiator%2C+L">L. Tiator</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Bacelar%2C+J+C+S">J. C. S. Bacelar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bantes%2C+B">B. Bantes</a>, <a href="/search/nucl-ex?searchtype=author&query=Bartholomy%2C+O">O. Bartholomy</a>, <a href="/search/nucl-ex?searchtype=author&query=Bayadilov%2C+D+E">D. E. Bayadilov</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Beloglazov%2C+Y+A">Y. A. Beloglazov</a>, <a href="/search/nucl-ex?searchtype=author&query=Castelijns%2C+R">R. Castelijns</a>, <a href="/search/nucl-ex?searchtype=author&query=Crede%2C+V">V. Crede</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutz%2C+H">H. Dutz</a>, <a href="/search/nucl-ex?searchtype=author&query=Elsner%2C+D">D. Elsner</a>, <a href="/search/nucl-ex?searchtype=author&query=Ewald%2C+R">R. Ewald</a>, <a href="/search/nucl-ex?searchtype=author&query=Frommberger%2C+F">F. Frommberger</a>, <a href="/search/nucl-ex?searchtype=author&query=Funke%2C+C">C. Funke</a>, <a href="/search/nucl-ex?searchtype=author&query=Gregor%2C+R">R. Gregor</a>, <a href="/search/nucl-ex?searchtype=author&query=Gridnev%2C+A+B">A. B. Gridnev</a>, <a href="/search/nucl-ex?searchtype=author&query=Gutz%2C+E">E. Gutz</a>, <a href="/search/nucl-ex?searchtype=author&query=Hillert%2C+W">W. Hillert</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoeffgen%2C+S">S. Hoeffgen</a> , et al. (40 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1012.1021v1-abstract-short" style="display: inline;"> Quasi-free photoproduction of $畏'$ mesons off nucleons bound in the deuteron has been measured with the combined Crystal Barrel - TAPS detector. The experiment was done at a tagged photon beam of the ELSA electron accelerator in Bonn for incident photon energies from the production threshold up to 2.5 GeV. The $畏'$-mesons have been detected in coincidence with recoil protons and recoil neutrons. T… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1012.1021v1-abstract-full').style.display = 'inline'; document.getElementById('1012.1021v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1012.1021v1-abstract-full" style="display: none;"> Quasi-free photoproduction of $畏'$ mesons off nucleons bound in the deuteron has been measured with the combined Crystal Barrel - TAPS detector. The experiment was done at a tagged photon beam of the ELSA electron accelerator in Bonn for incident photon energies from the production threshold up to 2.5 GeV. The $畏'$-mesons have been detected in coincidence with recoil protons and recoil neutrons. The quasi-free proton data are in good agreement with the results for free protons, indicating that nuclear effects have no significant impact. The coincidence with recoil neutrons provides the first data for the $纬n \rightarrow n畏'$ reaction. In addition, also first estimates for coherent $畏'$-production off the deuteron have been obtained. In agreement with model predictions, the total cross section for this channel is found to be very small, at most at the level of a few nb. The data are compared to model calculations taking into account contributions from nucleon resonances and $t$-channel exchanges. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1012.1021v1-abstract-full').style.display = 'none'; document.getElementById('1012.1021v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 December, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">Accepted for publication in Eur. Phys. J. A</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. A 47, 11 (2011) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1003.1346">arXiv:1003.1346</a> <span> [<a href="https://arxiv.org/pdf/1003.1346">pdf</a>, <a href="https://arxiv.org/ps/1003.1346">ps</a>, <a href="https://arxiv.org/format/1003.1346">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.81.065210">10.1103/PhysRevC.81.065210 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the Beam Asymmetry $危$ in the Forward Direction for pi0 Photoproduction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Sparks%2C+N">N. Sparks</a>, <a href="/search/nucl-ex?searchtype=author&query=Crede%2C+V">V. Crede</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Bacelar%2C+J+C+S">J. C. S. Bacelar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bantes%2C+R">R. Bantes</a>, <a href="/search/nucl-ex?searchtype=author&query=Bartholomy%2C+O">O. Bartholomy</a>, <a href="/search/nucl-ex?searchtype=author&query=Bayadilov%2C+D">D. Bayadilov</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Beloglazov%2C+Y+A">Y. A. Beloglazov</a>, <a href="/search/nucl-ex?searchtype=author&query=Castelijns%2C+R">R. Castelijns</a>, <a href="/search/nucl-ex?searchtype=author&query=Elsner%2C+D">D. Elsner</a>, <a href="/search/nucl-ex?searchtype=author&query=Ewald%2C+R">R. Ewald</a>, <a href="/search/nucl-ex?searchtype=author&query=Frommberger%2C+F">F. Frommberger</a>, <a href="/search/nucl-ex?searchtype=author&query=Funke%2C+C">C. Funke</a>, <a href="/search/nucl-ex?searchtype=author&query=Gregor%2C+R">R. Gregor</a>, <a href="/search/nucl-ex?searchtype=author&query=Gridnev%2C+A">A. Gridnev</a>, <a href="/search/nucl-ex?searchtype=author&query=Gutz%2C+E">E. Gutz</a>, <a href="/search/nucl-ex?searchtype=author&query=Hillert%2C+W">W. Hillert</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoffmeister%2C+P">P. Hoffmeister</a>, <a href="/search/nucl-ex?searchtype=author&query=Jaegle%2C+I">I. Jaegle</a>, <a href="/search/nucl-ex?searchtype=author&query=Junkersfeld%2C+J">J. Junkersfeld</a>, <a href="/search/nucl-ex?searchtype=author&query=Kalinowsky%2C+H">H. Kalinowsky</a>, <a href="/search/nucl-ex?searchtype=author&query=Kammer%2C+S">S. Kammer</a>, <a href="/search/nucl-ex?searchtype=author&query=Klein%2C+F">Frank Klein</a>, <a href="/search/nucl-ex?searchtype=author&query=Klein%2C+F">Friedrich Klein</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="1003.1346v3-abstract-short" style="display: inline;"> Photoproduction of neutral pions has been studied with the CBELSA/TAPS detector for photon energies between 0.92 and 1.68~GeV at the electron accelerator ELSA. The beam asymmetry~$危$ has been extracted for $115^\circ < 胃_{\rm c.m.} < 155^\circ$ of the $蟺^0$~meson and for $胃_{\rm c.m.} < 60^\circ$. The new beam asymmetry data improve the world database for photon energies above 1.5~GeV and, by cove… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1003.1346v3-abstract-full').style.display = 'inline'; document.getElementById('1003.1346v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1003.1346v3-abstract-full" style="display: none;"> Photoproduction of neutral pions has been studied with the CBELSA/TAPS detector for photon energies between 0.92 and 1.68~GeV at the electron accelerator ELSA. The beam asymmetry~$危$ has been extracted for $115^\circ < 胃_{\rm c.m.} < 155^\circ$ of the $蟺^0$~meson and for $胃_{\rm c.m.} < 60^\circ$. The new beam asymmetry data improve the world database for photon energies above 1.5~GeV and, by covering the very forward region, extend previously published data for the same reaction by our collaboration. The angular dependence of $危$ shows overall good agreement with the SAID parameterization. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1003.1346v3-abstract-full').style.display = 'none'; document.getElementById('1003.1346v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 July, 2010; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 March, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">11 pages, 10 figures, published in Phys. Rev. C, included LEPS data and MAID 2007 predictions for comparison with our data</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.C81:065210,2010 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0804.4841">arXiv:0804.4841</a> <span> [<a href="https://arxiv.org/pdf/0804.4841">pdf</a>, <a href="https://arxiv.org/ps/0804.4841">ps</a>, <a href="https://arxiv.org/format/0804.4841">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.100.252002">10.1103/PhysRevLett.100.252002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quasi-free photoproduction of eta-mesons of the neutron </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Jaegle%2C+I">I. Jaegle</a>, <a href="/search/nucl-ex?searchtype=author&query=Mertens%2C+T">T. Mertens</a>, <a href="/search/nucl-ex?searchtype=author&query=Anisovich%2C+A+V">A. V. Anisovich</a>, <a href="/search/nucl-ex?searchtype=author&query=Bacelar%2C+J+C+S">J. C. S. Bacelar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bantes%2C+B">B. Bantes</a>, <a href="/search/nucl-ex?searchtype=author&query=Bartholomy%2C+O">O. Bartholomy</a>, <a href="/search/nucl-ex?searchtype=author&query=Bayadilov%2C+D">D. Bayadilov</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Beloglazov%2C+Y+A">Y. A. Beloglazov</a>, <a href="/search/nucl-ex?searchtype=author&query=Castelijns%2C+R">R. Castelijns</a>, <a href="/search/nucl-ex?searchtype=author&query=Crede%2C+V">V. Crede</a>, <a href="/search/nucl-ex?searchtype=author&query=Dutz%2C+H">H. Dutz</a>, <a href="/search/nucl-ex?searchtype=author&query=Ehmanns%2C+A">A. Ehmanns</a>, <a href="/search/nucl-ex?searchtype=author&query=Elsner%2C+D">D. Elsner</a>, <a href="/search/nucl-ex?searchtype=author&query=Essig%2C+K">K. Essig</a>, <a href="/search/nucl-ex?searchtype=author&query=Ewald%2C+R">R. Ewald</a>, <a href="/search/nucl-ex?searchtype=author&query=Fabry%2C+I">I. Fabry</a>, <a href="/search/nucl-ex?searchtype=author&query=Fuchs%2C+M">M. Fuchs</a>, <a href="/search/nucl-ex?searchtype=author&query=Funke%2C+C">C. Funke</a>, <a href="/search/nucl-ex?searchtype=author&query=Gothe%2C+R">R. Gothe</a>, <a href="/search/nucl-ex?searchtype=author&query=Gregor%2C+R">R. Gregor</a>, <a href="/search/nucl-ex?searchtype=author&query=Gridnev%2C+A+B">A. B. Gridnev</a>, <a href="/search/nucl-ex?searchtype=author&query=Gutz%2C+E">E. Gutz</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoeffgen%2C+S">S. Hoeffgen</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoffmeister%2C+P">P. Hoffmeister</a> , et al. (47 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="0804.4841v1-abstract-short" style="display: inline;"> Quasi-free photoproduction of eta-mesons off nucleons bound in the deuteron has been measured with the CBELSA/TAPS detector for incident photon energies up to 2.5 GeV at the Bonn ELSA accelerator. The eta-mesons have been detected in coincidence with recoil protons and recoil neutrons, which allows a detailed comparison of the quasi-free n(gamma,eta)n and p(gamma,eta)p reactions. The excitation… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0804.4841v1-abstract-full').style.display = 'inline'; document.getElementById('0804.4841v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0804.4841v1-abstract-full" style="display: none;"> Quasi-free photoproduction of eta-mesons off nucleons bound in the deuteron has been measured with the CBELSA/TAPS detector for incident photon energies up to 2.5 GeV at the Bonn ELSA accelerator. The eta-mesons have been detected in coincidence with recoil protons and recoil neutrons, which allows a detailed comparison of the quasi-free n(gamma,eta)n and p(gamma,eta)p reactions. The excitation function for eta-production off the neutron shows a pronounced bump-like structure at W=1.68 GeV (E_g ~ 1 GeV), which is absent for the proton. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0804.4841v1-abstract-full').style.display = 'none'; document.getElementById('0804.4841v1-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, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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">accepted for publication 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.100:252002,2008 </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg> <a href="https://info.arxiv.org/help/contact.html"> Contact</a> </li> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>subscribe to arXiv mailings</title><desc>Click here to subscribe</desc><path d="M476 3.2L12.5 270.6c-18.1 10.4-15.8 35.6 2.2 43.2L121 358.4l287.3-253.2c5.5-4.9 13.3 2.6 8.6 8.3L176 407v80.5c0 23.6 28.5 32.9 42.5 15.8L282 426l124.6 52.2c14.2 6 30.4-2.9 33-18.2l72-432C515 7.8 493.3-6.8 476 3.2z"/></svg> <a href="https://info.arxiv.org/help/subscribe"> Subscribe</a> </li> </ul> </div> </div> </div>   <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/license/index.html">Copyright</a></li> <li><a href="https://info.arxiv.org/help/policies/privacy_policy.html">Privacy Policy</a></li> </ul> </div> <div class="column sorry-app-links"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/web_accessibility.html">Web Accessibility Assistance</a></li> <li> <p class="help"> <a class="a11y-main-link" href="https://status.arxiv.org" target="_blank">arXiv Operational Status <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512" class="icon filter-dark_grey" role="presentation"><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"/></svg></a><br> Get status notifications via <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/email/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg>email</a> or <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/slack/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="icon filter-black" role="presentation"><path d="M94.12 315.1c0 25.9-21.16 47.06-47.06 47.06S0 341 0 315.1c0-25.9 21.16-47.06 47.06-47.06h47.06v47.06zm23.72 0c0-25.9 21.16-47.06 47.06-47.06s47.06 21.16 47.06 47.06v117.84c0 25.9-21.16 47.06-47.06 47.06s-47.06-21.16-47.06-47.06V315.1zm47.06-188.98c-25.9 0-47.06-21.16-47.06-47.06S139 32 164.9 32s47.06 21.16 47.06 47.06v47.06H164.9zm0 23.72c25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06H47.06C21.16 243.96 0 222.8 0 196.9s21.16-47.06 47.06-47.06H164.9zm188.98 47.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06h-47.06V196.9zm-23.72 0c0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06V79.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06V196.9zM283.1 385.88c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06v-47.06h47.06zm0-23.72c-25.9 0-47.06-21.16-47.06-47.06 0-25.9 21.16-47.06 47.06-47.06h117.84c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06H283.1z"/></svg>slack</a> </p> </li> </ul> </div> </div> </div>  </div> </footer> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/member_acknowledgement.js"></script> </body> </html>

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