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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/2204.01817">arXiv:2204.01817</a> <span> [<a href="https://arxiv.org/pdf/2204.01817">pdf</a>, <a href="https://arxiv.org/format/2204.01817">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </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.2023.137702">10.1016/j.physletb.2023.137702 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Double $J/蠄$ production in pion-nucleon scattering at COMPASS </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a>, <a href="/search/hep-ex?searchtype=author&query=Bradamante%2C+F">F. Bradamante</a>, <a href="/search/hep-ex?searchtype=author&query=Bressan%2C+A">A. Bressan</a>, <a href="/search/hep-ex?searchtype=author&query=Burtsev%2C+V+E">V. E. Burtsev</a>, <a href="/search/hep-ex?searchtype=author&query=Chang%2C+W+-">W. -C. Chang</a>, <a href="/search/hep-ex?searchtype=author&query=Chatterjee%2C+C">C. Chatterjee</a>, <a href="/search/hep-ex?searchtype=author&query=Chiosso%2C+M">M. Chiosso</a>, <a href="/search/hep-ex?searchtype=author&query=Chumakov%2C+A+G">A. G. Chumakov</a>, <a href="/search/hep-ex?searchtype=author&query=Chung%2C+S+-">S. -U. Chung</a>, <a href="/search/hep-ex?searchtype=author&query=Cicuttin%2C+A">A. Cicuttin</a>, <a href="/search/hep-ex?searchtype=author&query=Correia%2C+P+M+M">P. M. M. Correia</a> , et al. (170 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="2204.01817v1-abstract-short" style="display: inline;"> We present the study of the production of double $J/蠄$ mesons using COMPASS data collected with a 190 GeV/$c$ $蟺^-$ beam scattering off NH$_{3}$, Al and W targets. Kinematic distributions of the collected double $J/蠄$ events are analysed, and the double $J/蠄$ production cross section is estimated for each of the COMPASS targets. The results are compared to predictions from single- and double-parto… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2204.01817v1-abstract-full').style.display = 'inline'; document.getElementById('2204.01817v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2204.01817v1-abstract-full" style="display: none;"> We present the study of the production of double $J/蠄$ mesons using COMPASS data collected with a 190 GeV/$c$ $蟺^-$ beam scattering off NH$_{3}$, Al and W targets. Kinematic distributions of the collected double $J/蠄$ events are analysed, and the double $J/蠄$ production cross section is estimated for each of the COMPASS targets. The results are compared to predictions from single- and double-parton scattering models as well as the pion intrinsic charm and the tetraquark exotic resonance hypotheses. It is demonstrated that the single parton scattering production mechanism gives the dominant contribution that is sufficient to describe the data. An upper limit on the double intrinsic charm content of pion is evaluated. No significant signatures that could be associated with exotic tetraquarks are found in the double $J/蠄$ mass spectrum. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2204.01817v1-abstract-full').style.display = 'none'; document.getElementById('2204.01817v1-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 April, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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">12 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2022--073 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2108.01744">arXiv:2108.01744</a> <span> [<a href="https://arxiv.org/pdf/2108.01744">pdf</a>, <a href="https://arxiv.org/format/2108.01744">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.105.012005">10.1103/PhysRevD.105.012005 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The exotic meson $蟺_1(1600)$ with $J^{PC} = 1^{-+}$ and its decay into $蟻(770)蟺$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Antequera%2C+J+B">J. Berenguer Antequera</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a>, <a href="/search/hep-ex?searchtype=author&query=Bradamante%2C+F">F. Bradamante</a>, <a href="/search/hep-ex?searchtype=author&query=Bressan%2C+A">A. Bressan</a>, <a href="/search/hep-ex?searchtype=author&query=Burtsev%2C+V+E">V. E. Burtsev</a>, <a href="/search/hep-ex?searchtype=author&query=Chang%2C+W+-">W. -C. Chang</a>, <a href="/search/hep-ex?searchtype=author&query=Chatterjee%2C+C">C. Chatterjee</a>, <a href="/search/hep-ex?searchtype=author&query=Chiosso%2C+M">M. Chiosso</a>, <a href="/search/hep-ex?searchtype=author&query=Chumakov%2C+A+G">A. G. Chumakov</a>, <a href="/search/hep-ex?searchtype=author&query=Chung%2C+S+-">S. -U. Chung</a> , et al. (171 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="2108.01744v2-abstract-short" style="display: inline;"> We study the spin-exotic $J^{PC} = 1^{-+}$ amplitude in single-diffractive dissociation of 190 GeV$/c$ pions into $蟺^-蟺^-蟺^+$ using a hydrogen target and confirm the $蟺_1(1600) \to 蟻(770) 蟺$ amplitude, which interferes with a nonresonant $1^{-+}$ amplitude. We demonstrate that conflicting conclusions from previous studies on these amplitudes can be attributed to different analysis models and diffe… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.01744v2-abstract-full').style.display = 'inline'; document.getElementById('2108.01744v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2108.01744v2-abstract-full" style="display: none;"> We study the spin-exotic $J^{PC} = 1^{-+}$ amplitude in single-diffractive dissociation of 190 GeV$/c$ pions into $蟺^-蟺^-蟺^+$ using a hydrogen target and confirm the $蟺_1(1600) \to 蟻(770) 蟺$ amplitude, which interferes with a nonresonant $1^{-+}$ amplitude. We demonstrate that conflicting conclusions from previous studies on these amplitudes can be attributed to different analysis models and different treatment of the dependence of the amplitudes on the squared four-momentum transfer and we thus reconcile their experimental findings. We study the nonresonant contributions to the $蟺^-蟺^-蟺^+$ final state using pseudo-data generated on the basis of a Deck model. Subjecting pseudo-data and real data to the same partial-wave analysis, we find good agreement concerning the spectral shape and its dependence on the squared four-momentum transfer for the $J^{PC} = 1^{-+}$ amplitude and also for amplitudes with other $J^{PC}$ quantum numbers. We investigate for the first time the amplitude of the $蟺^-蟺^+$ subsystem with $J^{PC} = 1^{--}$ in the $3蟺$ amplitude with $J^{PC} = 1^{-+}$ employing the novel freed-isobar analysis scheme. We reveal this $蟺^-蟺^+$ amplitude to be dominated by the $蟻(770)$ for both the $蟺_1(1600)$ and the nonresonant contribution. We determine the $蟻(770)$ resonance parameters within the three-pion final state. These findings largely confirm the underlying assumptions for the isobar model used in all previous partial-wave analyses addressing the $J^{PC} = 1^{-+}$ amplitude. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.01744v2-abstract-full').style.display = 'none'; document.getElementById('2108.01744v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 3 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">Journal ref:</span> Phys.Rev.D 105 (2022) 1, 012005 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2104.13585">arXiv:2104.13585</a> <span> [<a href="https://arxiv.org/pdf/2104.13585">pdf</a>, <a href="https://arxiv.org/format/2104.13585">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </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.2021.136834">10.1016/j.physletb.2021.136834 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Probing transversity by measuring $螞$ polarisation in SIDIS </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Antequera%2C+J+B">J. Berenguer Antequera</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a>, <a href="/search/hep-ex?searchtype=author&query=Bradamante%2C+F">F. Bradamante</a>, <a href="/search/hep-ex?searchtype=author&query=Bressan%2C+A">A. Bressan</a>, <a href="/search/hep-ex?searchtype=author&query=Burtsev%2C+V+E">V. E. Burtsev</a>, <a href="/search/hep-ex?searchtype=author&query=Chang%2C+W+-">W. -C. Chang</a>, <a href="/search/hep-ex?searchtype=author&query=Chatterjee%2C+C">C. Chatterjee</a>, <a href="/search/hep-ex?searchtype=author&query=Chiosso%2C+M">M. Chiosso</a>, <a href="/search/hep-ex?searchtype=author&query=Chumakov%2C+A+G">A. G. Chumakov</a>, <a href="/search/hep-ex?searchtype=author&query=Chung%2C+S+-">S. -U. Chung</a> , et al. (175 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="2104.13585v2-abstract-short" style="display: inline;"> Based on the observation of sizeable target-transverse-spin asymmetries in single-hadron and hadron-pair production in Semi-Inclusive measurements of Deep Inelastic Scattering (SIDIS), the chiral-odd transversity quark distribution functions $h_1^q$ are nowadays well established. Several possible channels to access these functions were originally proposed. One candidate is the measurement of the p… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.13585v2-abstract-full').style.display = 'inline'; document.getElementById('2104.13585v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2104.13585v2-abstract-full" style="display: none;"> Based on the observation of sizeable target-transverse-spin asymmetries in single-hadron and hadron-pair production in Semi-Inclusive measurements of Deep Inelastic Scattering (SIDIS), the chiral-odd transversity quark distribution functions $h_1^q$ are nowadays well established. Several possible channels to access these functions were originally proposed. One candidate is the measurement of the polarisation of $螞$ hyperons produced in SIDIS off transversely polarised nucleons, where the transverse polarisation of the struck quark might be transferred to the final-state hyperon. In this article, we present the COMPASS results on the transversity-induced polarisation of $螞$ and $\bar螞$ hyperons produced in SIDIS off transversely polarised protons. Within the experimental uncertainties, no significant deviation from zero was observed. The results are discussed in the context of different models taking into account previous experimental results on $h_1^u$ and $h_1^d$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.13585v2-abstract-full').style.display = 'none'; document.getElementById('2104.13585v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 April, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 April, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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">18 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2021-072 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.03271">arXiv:2009.03271</a> <span> [<a href="https://arxiv.org/pdf/2009.03271">pdf</a>, <a href="https://arxiv.org/format/2009.03271">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </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/epjc/s10052-020-08740-y">10.1140/epjc/s10052-020-08740-y <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Spin Density Matrix Elements in Exclusive $蠅$ Meson Muoproduction $^*$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Antoshkin%2C+A">A. Antoshkin</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Antequera%2C+J+B">J. Berenguer Antequera</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a>, <a href="/search/hep-ex?searchtype=author&query=Bradamante%2C+F">F. Bradamante</a>, <a href="/search/hep-ex?searchtype=author&query=Bressan%2C+A">A. Bressan</a>, <a href="/search/hep-ex?searchtype=author&query=Burtsev%2C+V+E">V. E. Burtsev</a>, <a href="/search/hep-ex?searchtype=author&query=Chang%2C+W+-">W. -C. Chang</a>, <a href="/search/hep-ex?searchtype=author&query=Chatterjee%2C+C">C. Chatterjee</a>, <a href="/search/hep-ex?searchtype=author&query=Chiosso%2C+M">M. Chiosso</a>, <a href="/search/hep-ex?searchtype=author&query=Chumakov%2C+A+G">A. G. Chumakov</a> , et al. (176 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2009.03271v3-abstract-short" style="display: inline;"> We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $蠅$ meson muoproduction on the proton at COMPASS using 160 GeV/$c$ polarised $ 渭^{+}$ and $ 渭^{-}$ beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/$c^2$ $< W <$ 17.0 GeV/$c^2$, with the average kinematics $\langle Q^{2} \rangle=$ 2.1 (GeV/$c$)$^2$, $\langle W \rangle= 7.6$ GeV… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.03271v3-abstract-full').style.display = 'inline'; document.getElementById('2009.03271v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.03271v3-abstract-full" style="display: none;"> We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $蠅$ meson muoproduction on the proton at COMPASS using 160 GeV/$c$ polarised $ 渭^{+}$ and $ 渭^{-}$ beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/$c^2$ $< W <$ 17.0 GeV/$c^2$, with the average kinematics $\langle Q^{2} \rangle=$ 2.1 (GeV/$c$)$^2$, $\langle W \rangle= 7.6$ GeV/$c^2$, and $\langle p^{2}_{\rm T} \rangle = 0.16$ (GeV/$c$)$^2$. Here, $Q^2$ denotes the virtuality of the exchanged photon, $W$ the mass of the final hadronic system and $p_T$ the transverse momentum of the $蠅$ meson with respect to the virtual-photon direction. The measured non-zero SDMEs for the transitions of transversely polarised virtual photons to longitudinally polarised vector mesons ($纬^*_T \to V_L$) indicate a violation of $s$-channel helicity conservation. Additionally, we observe a sizeable contribution of unnatural-parity-exchange (UPE) transitions that decreases with increasing $W$. The results provide important input for modelling Generalised Parton Distributions (GPDs). In particular, they may allow to evaluate in a model-dependent way the contribution of UPE transitions and assess the role of parton helicity-flip GPDs in exclusive $蠅$ production. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.03271v3-abstract-full').style.display = 'none'; document.getElementById('2009.03271v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 7 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">31 pages, 12 figures, 1 appendix</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2020-169 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2006.05342">arXiv:2006.05342</a> <span> [<a href="https://arxiv.org/pdf/2006.05342">pdf</a>, <a href="https://arxiv.org/format/2006.05342">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> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.127.082501">10.1103/PhysRevLett.127.082501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Triangle Singularity as the Origin of the $a_1(1420)$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Antoshkin%2C+A">A. Antoshkin</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Antequera%2C+J+B">J. Berenguer Antequera</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a>, <a href="/search/hep-ex?searchtype=author&query=Bradamante%2C+F">F. Bradamante</a>, <a href="/search/hep-ex?searchtype=author&query=Bressan%2C+A">A. Bressan</a>, <a href="/search/hep-ex?searchtype=author&query=Burtsev%2C+V+E">V. E. Burtsev</a>, <a href="/search/hep-ex?searchtype=author&query=Chang%2C+W+-">W. -C. Chang</a>, <a href="/search/hep-ex?searchtype=author&query=Chatterjee%2C+C">C. Chatterjee</a>, <a href="/search/hep-ex?searchtype=author&query=Chiosso%2C+M">M. Chiosso</a>, <a href="/search/hep-ex?searchtype=author&query=Chumakov%2C+A+G">A. G. Chumakov</a> , et al. (173 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="2006.05342v3-abstract-short" style="display: inline;"> The COMPASS experiment recently discovered a new isovector resonance-like signal with axial-vector quantum numbers, the $a_1(1420)$, decaying to $f_0(980)蟺$. With a mass too close to and a width smaller than the axial-vector ground state $a_1(1260)$, it was immediately interpreted as a new light exotic meson, similar to the $X$, $Y$, $Z$ states in the hidden-charm sector. We show that a resonance-… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.05342v3-abstract-full').style.display = 'inline'; document.getElementById('2006.05342v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.05342v3-abstract-full" style="display: none;"> The COMPASS experiment recently discovered a new isovector resonance-like signal with axial-vector quantum numbers, the $a_1(1420)$, decaying to $f_0(980)蟺$. With a mass too close to and a width smaller than the axial-vector ground state $a_1(1260)$, it was immediately interpreted as a new light exotic meson, similar to the $X$, $Y$, $Z$ states in the hidden-charm sector. We show that a resonance-like signal fully matching the experimental data is produced by the decay of the $a_1(1260)$ resonance into $K^\ast(\to K蟺)\bar{K}$ and subsequent rescattering through a triangle singularity into the coupled $f_0(980)蟺$ channel. The amplitude for this process is calculated using a new approach based on dispersion relations. The triangle-singularity model is fitted to the partial-wave data of the COMPASS experiment. Despite having less parameters, this fit shows a slightly better quality than the one using a resonance hypothesis and thus eliminates the need for an additional resonance in order to describe the data. We thereby demonstrate for the first time in the light-meson sector that a resonance-like structure in the experimental data can be described by rescattering through a triangle singularity, providing evidence for a genuine three-body effect. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.05342v3-abstract-full').style.display = 'none'; document.getElementById('2006.05342v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 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">7 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2020-104 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 127, 082501 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2003.11791">arXiv:2003.11791</a> <span> [<a href="https://arxiv.org/pdf/2003.11791">pdf</a>, <a href="https://arxiv.org/format/2003.11791">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2020.135600">10.1016/j.physletb.2020.135600 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Antiproton over proton and K$^-$ over K$^+$ multiplicity ratios at high $z$ in DIS </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Antoshkin%2C+A">A. Antoshkin</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Antequera%2C+J+B">J. Berenguer Antequera</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a>, <a href="/search/hep-ex?searchtype=author&query=Bradamante%2C+F">F. Bradamante</a>, <a href="/search/hep-ex?searchtype=author&query=Bressan%2C+A">A. Bressan</a>, <a href="/search/hep-ex?searchtype=author&query=Buechele%2C+M">M. Buechele</a>, <a href="/search/hep-ex?searchtype=author&query=Burtsev%2C+V+E">V. E. Burtsev</a>, <a href="/search/hep-ex?searchtype=author&query=Chang%2C+W+-">W. -C. Chang</a>, <a href="/search/hep-ex?searchtype=author&query=Chatterjee%2C+C">C. Chatterjee</a>, <a href="/search/hep-ex?searchtype=author&query=Chiosso%2C+M">M. Chiosso</a> , et al. (174 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="2003.11791v1-abstract-short" style="display: inline;"> The $\bar{\rm p} $ over p multiplicity ratio is measured in deep-inelastic scattering for the first time using (anti-) protons carrying a large fraction of the virtual-photon energy, $z>0.5$. The data were obtained by the COMPASS Collaboration using a 160 GeV muon beam impinging on an isoscalar $^6$LiD target. The regime of deep-inelastic scattering is ensured by requiring $Q^2$ > 1 (GeV/$c$)$^2$… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2003.11791v1-abstract-full').style.display = 'inline'; document.getElementById('2003.11791v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2003.11791v1-abstract-full" style="display: none;"> The $\bar{\rm p} $ over p multiplicity ratio is measured in deep-inelastic scattering for the first time using (anti-) protons carrying a large fraction of the virtual-photon energy, $z>0.5$. The data were obtained by the COMPASS Collaboration using a 160 GeV muon beam impinging on an isoscalar $^6$LiD target. The regime of deep-inelastic scattering is ensured by requiring $Q^2$ > 1 (GeV/$c$)$^2$ for the photon virtuality and $W > 5$ GeV/$c^2$ for the invariant mass of the produced hadronic system. The range in Bjorken-$x$ is restricted to $0.01 < x < 0.40$. Protons and antiprotons are identified in the momentum range $20 梅60$ GeV/$c$. In the whole studied $z$-region, the $\bar{\rm p}$ over p multiplicity ratio is found to be below the lower limit expected from calculations based on leading-order perturbative Quantum Chromodynamics (pQCD). Extending our earlier analysis of the K$^-$ over K$^+$ multiplicity ratio by including now events with larger virtual-photon energies, this ratio becomes closer to the expectation of next-to-leading order pQCD. The results of both analyses strengthen our earlier conclusion that the phase space available for hadronisation should be taken into account in the pQCD formalism. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2003.11791v1-abstract-full').style.display = 'none'; document.getElementById('2003.11791v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 March, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">19 pages, 7 figures, 3 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2020-041 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1912.10322">arXiv:1912.10322</a> <span> [<a href="https://arxiv.org/pdf/1912.10322">pdf</a>, <a href="https://arxiv.org/format/1912.10322">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </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.nuclphysb.2020.115039">10.1016/j.nuclphysb.2020.115039 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Contribution of exclusive diffractive processes to the measured azimuthal asymmetries in SIDIS </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Agarwala%2C+J">J. Agarwala</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anfimov%2C+N+V">N. V. Anfimov</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Antoshkin%2C+A">A. Antoshkin</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Antequera%2C+J+B">J. Berenguer Antequera</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a>, <a href="/search/hep-ex?searchtype=author&query=Bordalo%2C+P">P. Bordalo</a>, <a href="/search/hep-ex?searchtype=author&query=Bradamante%2C+F">F. Bradamante</a>, <a href="/search/hep-ex?searchtype=author&query=Bressan%2C+A">A. Bressan</a>, <a href="/search/hep-ex?searchtype=author&query=Buechele%2C+M">M. Buechele</a>, <a href="/search/hep-ex?searchtype=author&query=Burtsev%2C+V+E">V. E. Burtsev</a> , et al. (182 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="1912.10322v1-abstract-short" style="display: inline;"> Hadron leptoproduction in Semi-Inclusive measurements of Deep-Inelastic Scattering (SIDIS) on unpolarised nucleons allows one to get information on the intrinsic transverse momentum of quarks in a nucleon and on the Boer-Mulders function through the measurement of azimuthal modulations in the cross section. These modulations were recently measured by the HERMES experiment at DESY on proton and deu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1912.10322v1-abstract-full').style.display = 'inline'; document.getElementById('1912.10322v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1912.10322v1-abstract-full" style="display: none;"> Hadron leptoproduction in Semi-Inclusive measurements of Deep-Inelastic Scattering (SIDIS) on unpolarised nucleons allows one to get information on the intrinsic transverse momentum of quarks in a nucleon and on the Boer-Mulders function through the measurement of azimuthal modulations in the cross section. These modulations were recently measured by the HERMES experiment at DESY on proton and deuteron targets, and by the COMPASS experiment using the CERN SPS muon beam and a $^6$LiD target. In both cases, the amplitudes of the $\cos蠁_h$ and $\cos 2蠁_h$ modulations show strong kinematic dependences for both positive and negative hadrons. It has been known since some time that the measured final-state hadrons in those SIDIS experiments receive a contribution from exclusive diffractive production of vector mesons, particularly important at large values of $z$, the fraction of the virtual photon energy carried by the hadron. In previous measurements of azimuthal asymmetries this contribution was not taken into account, because it was not known that it could distort the azimuthal modulations. Presently, a method to evaluate the contribution of the exclusive reactions to the azimuthal asymmetries measured by COMPASS has been developed. The subtraction of this contribution results in a better understanding of the kinematic effects, and the remaining non-zero $\cos 2蠁_h$ modulation gives indication for a non-zero Boer-Mulders effect. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1912.10322v1-abstract-full').style.display = 'none'; document.getElementById('1912.10322v1-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, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">13 pages, 7 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2019-286 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1903.12030">arXiv:1903.12030</a> <span> [<a href="https://arxiv.org/pdf/1903.12030">pdf</a>, <a href="https://arxiv.org/format/1903.12030">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2020.135454">10.1016/j.physletb.2020.135454 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the cross section for hard exclusive $蟺^0$ leptoproduction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anfimov%2C+N+V">N. V. Anfimov</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Antoshkin%2C+A">A. Antoshkin</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a>, <a href="/search/hep-ex?searchtype=author&query=Bordalo%2C+P">P. Bordalo</a>, <a href="/search/hep-ex?searchtype=author&query=Bradamante%2C+F">F. Bradamante</a>, <a href="/search/hep-ex?searchtype=author&query=Bressan%2C+A">A. Bressan</a>, <a href="/search/hep-ex?searchtype=author&query=Buechele%2C+M">M. Buechele</a>, <a href="/search/hep-ex?searchtype=author&query=Burtsev%2C+V+E">V. E. Burtsev</a>, <a href="/search/hep-ex?searchtype=author&query=Chang%2C+W+-">W. -C. Chang</a>, <a href="/search/hep-ex?searchtype=author&query=Chatterjee%2C+C">C. Chatterjee</a> , et al. (178 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1903.12030v1-abstract-short" style="display: inline;"> We report on a measurement of hard exclusive $蟺^0$ muoproduction on the proton by COMPASS using 160 GeV/$c$ polarised $渭^+$ and $渭^-$ beams of the CERN SPS impinging on a liquid hydrogen target. From the average of the measured $渭^+$ and $渭^-$ cross sections, the virtual-photon proton cross section is determined as a function of the squared four-momentum transfer between initial and final proton i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1903.12030v1-abstract-full').style.display = 'inline'; document.getElementById('1903.12030v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1903.12030v1-abstract-full" style="display: none;"> We report on a measurement of hard exclusive $蟺^0$ muoproduction on the proton by COMPASS using 160 GeV/$c$ polarised $渭^+$ and $渭^-$ beams of the CERN SPS impinging on a liquid hydrogen target. From the average of the measured $渭^+$ and $渭^-$ cross sections, the virtual-photon proton cross section is determined as a function of the squared four-momentum transfer between initial and final proton in the range $0.08\,(\text{GeV/}c)^2 < |t| < 0.64\,(\text{GeV/}c)^2$. The average kinematics of the measurement are $\langle Q^2 \rangle =2.0\; {(\text{GeV}/c)^2}$, $\langle 谓\rangle = 12.8\; {\text{GeV}}$, $\langle x_{Bj} \rangle = 0.093 $ and $\langle -t \rangle = 0.256\; {(\text{GeV}/c)^2} $. Fitting the azimuthal dependence reveals a combined contribution by transversely and longitudinally polarised photons of $(8.1 \ \pm \ 0.9_{\text{stat}}{}_{- \ 1.0}^{+ \ 1.1}\big\rvert_{\text{sys}})\,{\text{nb}}/{(\text{GeV}/c)^{2}}$, as well as transverse-transverse and longitudinal-transverse interference contributions of $(-6.0 \pm 1.3_{\text{stat}}{}_{- \ 0.7}^{+ \ 0.7}\big\rvert_{\text{sys}})\,{\text{nb}}/{(\text{GeV}/c)^{2}}$ and $(1.4 \pm 0.5_{\text{stat}}{}_{- \ 0.2}^{+ \ 0.3}\big\rvert_{\text{sys}})\,{\text{nb}}/{(\text{GeV}/c)^{2}}$, respectively. Our results provide important input for modelling Generalised Parton Distributions. In the context of the phenomenological Goloskokov-Kroll model, the statistically significant transverse-transverse interference contribution constitutes clear experimental evidence for the chiral-odd GPD $\overline{E}_T$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1903.12030v1-abstract-full').style.display = 'none'; document.getElementById('1903.12030v1-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 March, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2019-049 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1809.02936">arXiv:1809.02936</a> <span> [<a href="https://arxiv.org/pdf/1809.02936">pdf</a>, <a href="https://arxiv.org/format/1809.02936">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </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.nuclphysb.2018.12.024">10.1016/j.nuclphysb.2018.12.024 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of $P_T$-weighted Sivers asymmetries in leptoproduction of hadrons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anfimov%2C+N+V">N. V. Anfimov</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Antoshkin%2C+A">A. Antoshkin</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barone%2C+V">V. Barone</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bicker%2C+K">K. Bicker</a>, <a href="/search/hep-ex?searchtype=author&query=Bielert%2C+E+R">E. R. Bielert</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a>, <a href="/search/hep-ex?searchtype=author&query=Bordalo%2C+P">P. Bordalo</a>, <a href="/search/hep-ex?searchtype=author&query=Bradamante%2C+F">F. Bradamante</a>, <a href="/search/hep-ex?searchtype=author&query=Bressan%2C+A">A. Bressan</a>, <a href="/search/hep-ex?searchtype=author&query=Buechele%2C+M">M. Buechele</a> , et al. (188 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="1809.02936v1-abstract-short" style="display: inline;"> The transverse spin asymmetries measured in semi-inclusive leptoproduction of hadrons, when weighted with the hadron transverse momentum $P_T$, allow for the extraction of important transverse-momentum-dependent distribution functions. In particular, the weighted Sivers asymmetries provide direct information on the Sivers function, which is a leading-twist distribution that arises from a correlati… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.02936v1-abstract-full').style.display = 'inline'; document.getElementById('1809.02936v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1809.02936v1-abstract-full" style="display: none;"> The transverse spin asymmetries measured in semi-inclusive leptoproduction of hadrons, when weighted with the hadron transverse momentum $P_T$, allow for the extraction of important transverse-momentum-dependent distribution functions. In particular, the weighted Sivers asymmetries provide direct information on the Sivers function, which is a leading-twist distribution that arises from a correlation between the transverse momentum of an unpolarised quark in a transversely polarised nucleon and the spin of the nucleon. Using the high-statistics data collected by the COMPASS Collaboration in 2010 with a transversely polarised proton target, we have evaluated two types of $P_T$-weighted Sivers asymmetries, which are both proportional to the product of the firsttransverse moment of the Sivers function and of the fragmentation function. The results are compared to the standard unweighted Sivers asymmetries and used to extract the first transverse moments of the Sivers distributions for $u$ and $d$ quarks. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.02936v1-abstract-full').style.display = 'none'; document.getElementById('1809.02936v1-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 September, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">23 pages, 12 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2018-242 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1808.00848">arXiv:1808.00848</a> <span> [<a href="https://arxiv.org/pdf/1808.00848">pdf</a>, <a href="https://arxiv.org/format/1808.00848">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Letter of Intent: A New QCD facility at the M2 beam line of the CERN SPS (COMPASS++/AMBER) </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Adams%2C+B">B. Adams</a>, <a href="/search/hep-ex?searchtype=author&query=Aidala%2C+C+A">C. A. Aidala</a>, <a href="/search/hep-ex?searchtype=author&query=Akhunzyanov%2C+R">R. Akhunzyanov</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anfimov%2C+N+V">N. V. Anfimov</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Antoshkin%2C+A">A. Antoshkin</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Azhibekov%2C+A">A. Azhibekov</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Antequera%2C+J+B">J. Berenguer Antequera</a>, <a href="/search/hep-ex?searchtype=author&query=Bernauer%2C+J+C">J. C. Bernauer</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a>, <a href="/search/hep-ex?searchtype=author&query=Bordalo%2C+P">P. Bordalo</a> , et al. (242 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="1808.00848v6-abstract-short" style="display: inline;"> A New QCD facility at the M2 beam line of the CERN SPS COMPASS++/AMBER </span> <span class="abstract-full has-text-grey-dark mathjax" id="1808.00848v6-abstract-full" style="display: none;"> A New QCD facility at the M2 beam line of the CERN SPS COMPASS++/AMBER <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.00848v6-abstract-full').style.display = 'none'; document.getElementById('1808.00848v6-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 August, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 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">91 pages, 51 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-SPSC-2019-003 (SPSC-I-250) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1802.05913">arXiv:1802.05913</a> <span> [<a href="https://arxiv.org/pdf/1802.05913">pdf</a>, <a href="https://arxiv.org/format/1802.05913">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.98.092003">10.1103/PhysRevD.98.092003 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Light isovector resonances in $蟺^- p \to 蟺^-蟺^-蟺^+ p$ at 190 GeV/${\it c}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Aghasyan%2C+M">M. Aghasyan</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anfimov%2C+N+V">N. V. Anfimov</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Antoshkin%2C+A">A. Antoshkin</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Austregesilo%2C+A">A. Austregesilo</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bicker%2C+K">K. Bicker</a>, <a href="/search/hep-ex?searchtype=author&query=Bielert%2C+E+R">E. R. Bielert</a>, <a href="/search/hep-ex?searchtype=author&query=Birsa%2C+R">R. Birsa</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a>, <a href="/search/hep-ex?searchtype=author&query=Bordalo%2C+P">P. Bordalo</a>, <a href="/search/hep-ex?searchtype=author&query=Bradamante%2C+F">F. Bradamante</a> , et al. (200 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="1802.05913v2-abstract-short" style="display: inline;"> We have performed the most comprehensive resonance-model fit of $蟺^-蟺^-蟺^+$ states using the results of our previously published partial-wave analysis (PWA) of a large data set of diffractive-dissociation events from the reaction $蟺^- + p \to 蟺^-蟺^-蟺^+ + p_\text{recoil}$ with a 190 GeV/$c$ pion beam. The PWA results, which were obtained in 100 bins of three-pion mass, $0.5 < m_{3蟺} < 2.5$ GeV/… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.05913v2-abstract-full').style.display = 'inline'; document.getElementById('1802.05913v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1802.05913v2-abstract-full" style="display: none;"> We have performed the most comprehensive resonance-model fit of $蟺^-蟺^-蟺^+$ states using the results of our previously published partial-wave analysis (PWA) of a large data set of diffractive-dissociation events from the reaction $蟺^- + p \to 蟺^-蟺^-蟺^+ + p_\text{recoil}$ with a 190 GeV/$c$ pion beam. The PWA results, which were obtained in 100 bins of three-pion mass, $0.5 < m_{3蟺} < 2.5$ GeV/$c^2$, and simultaneously in 11 bins of the reduced four-momentum transfer squared, $0.1 < t' < 1.0$ $($GeV$/c)^2$, are subjected to a resonance-model fit using Breit-Wigner amplitudes to simultaneously describe a subset of 14 selected waves using 11 isovector light-meson states with $J^{PC} = 0^{-+}$, $1^{++}$, $2^{++}$, $2^{-+}$, $4^{++}$, and spin-exotic $1^{-+}$ quantum numbers. The model contains the well-known resonances $蟺(1800)$, $a_1(1260)$, $a_2(1320)$, $蟺_2(1670)$, $蟺_2(1880)$, and $a_4(2040)$. In addition, it includes the disputed $蟺_1(1600)$, the excited states $a_1(1640)$, $a_2(1700)$, and $蟺_2(2005)$, as well as the resonancelike $a_1(1420)$. We measure the resonance parameters mass and width of these objects by combining the information from the PWA results obtained in the 11 $t'$ bins. We extract the relative branching fractions of the $蟻(770) 蟺$ and $f_2(1270) 蟺$ decays of $a_2(1320)$ and $a_4(2040)$, where the former one is measured for the first time. In a novel approach, we extract the $t'$ dependence of the intensity of the resonances and of their phases. The $t'$ dependence of the intensities of most resonances differs distinctly from the $t'$ dependence of the nonresonant components. For the first time, we determine the $t'$ dependence of the phases of the production amplitudes and confirm that the production mechanism of the Pomeron exchange is common to all resonances. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.05913v2-abstract-full').style.display = 'none'; document.getElementById('1802.05913v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 October, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">224 pages, 172 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2018-021 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 98, 092003 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1802.02739">arXiv:1802.02739</a> <span> [<a href="https://arxiv.org/pdf/1802.02739">pdf</a>, <a href="https://arxiv.org/format/1802.02739">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2019.04.038">10.1016/j.physletb.2019.04.038 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Transverse Extension of Partons in the Proton probed by Deeply Virtual Compton Scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Akhunzyanov%2C+R">R. Akhunzyanov</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anfimov%2C+N+V">N. V. Anfimov</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Antoshkin%2C+A">A. Antoshkin</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Austregesilo%2C+A">A. Austregesilo</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bicker%2C+K">K. Bicker</a>, <a href="/search/hep-ex?searchtype=author&query=Bielert%2C+E+R">E. R. Bielert</a>, <a href="/search/hep-ex?searchtype=author&query=Birsa%2C+R">R. Birsa</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a>, <a href="/search/hep-ex?searchtype=author&query=Bordalo%2C+P">P. Bordalo</a>, <a href="/search/hep-ex?searchtype=author&query=Bradamante%2C+F">F. Bradamante</a> , et al. (202 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="1802.02739v2-abstract-short" style="display: inline;"> We report on the first measurement of exclusive single-photon muoproduction on the proton by COMPASS using 160 GeV/$c$ polarized $渭^+$ and $渭^-$ beams of the CERN SPS impinging on a liquid hydrogen target. We determine the dependence of the average of the measured $渭^+$ and $渭^-$ cross sections for deeply virtual Compton scattering on the squared four-momentum transfer $t$ from the initial to the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.02739v2-abstract-full').style.display = 'inline'; document.getElementById('1802.02739v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1802.02739v2-abstract-full" style="display: none;"> We report on the first measurement of exclusive single-photon muoproduction on the proton by COMPASS using 160 GeV/$c$ polarized $渭^+$ and $渭^-$ beams of the CERN SPS impinging on a liquid hydrogen target. We determine the dependence of the average of the measured $渭^+$ and $渭^-$ cross sections for deeply virtual Compton scattering on the squared four-momentum transfer $t$ from the initial to the final final proton. The slope $B$ of the $t$-dependence is fitted with a single exponential function, which yields $B=(4.3 \ \pm \ 0.6_{\text{stat}}\_{- \ 0.3}^{+ \ 0.1}\big\rvert_{\text{sys}}) (\text{GeV}/c)^{-2}$. This result can be converted into an average transverse extension of partons in the proton, $\sqrt{\langle r_{\perp}^2 \rangle} = (0.58 \ \pm \ 0.04_{\text{stat}}\_{- \ 0.02}^{+ \ 0.01}\big\rvert_{\text{sys}})\text{fm}$. For this measurement, the average virtuality of the photon mediating the interaction is $\langle Q^2 \rangle = 1.8\,(\text{GeV/}c)^2$ and the average value of the Bjorken variable is $\langle x_{\text{Bj}} \rangle = 0.056$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.02739v2-abstract-full').style.display = 'none'; document.getElementById('1802.02739v2-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 December, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2018-016 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1802.00584">arXiv:1802.00584</a> <span> [<a href="https://arxiv.org/pdf/1802.00584">pdf</a>, <a href="https://arxiv.org/format/1802.00584">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </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.2018.09.052">10.1016/j.physletb.2018.09.052 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> K$^{-}$ over K$^{+}$ multiplicity ratio for kaons produced in DIS with a large fraction of the virtual-photon energy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Akhunzyanov%2C+R">R. Akhunzyanov</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anfimov%2C+N+V">N. V. Anfimov</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Antoshkin%2C+A">A. Antoshkin</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bicker%2C+K">K. Bicker</a>, <a href="/search/hep-ex?searchtype=author&query=Bielert%2C+E+R">E. R. Bielert</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a>, <a href="/search/hep-ex?searchtype=author&query=Bordalo%2C+P">P. Bordalo</a>, <a href="/search/hep-ex?searchtype=author&query=Bradamante%2C+F">F. Bradamante</a>, <a href="/search/hep-ex?searchtype=author&query=Bressan%2C+A">A. Bressan</a>, <a href="/search/hep-ex?searchtype=author&query=Buechele%2C+M">M. Buechele</a> , et al. (186 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="1802.00584v2-abstract-short" style="display: inline;"> The K$^{-}$ over K$^{+}$ multiplicity ratio is measured in deep-inelastic scattering, for the first time for kaons carrying a large fraction $z$ of the virtual-photon energy. The data were obtained by the COMPASS collaboration using a 160 GeV muon beam and an isoscalar $^6$LiD target. The regime of deep-inelastic scattering is ensured by requiring $Q^2>1$ (GeV/$c)^2$ for the photon virtuality and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.00584v2-abstract-full').style.display = 'inline'; document.getElementById('1802.00584v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1802.00584v2-abstract-full" style="display: none;"> The K$^{-}$ over K$^{+}$ multiplicity ratio is measured in deep-inelastic scattering, for the first time for kaons carrying a large fraction $z$ of the virtual-photon energy. The data were obtained by the COMPASS collaboration using a 160 GeV muon beam and an isoscalar $^6$LiD target. The regime of deep-inelastic scattering is ensured by requiring $Q^2>1$ (GeV/$c)^2$ for the photon virtuality and $W>5$ GeV/$c^2$ for the invariant mass of the produced hadronic system. Kaons are identified in the momentum range from 12 GeV/$c$ to 40 GeV/$c$, thereby restricting the range in Bjorken-$x$ to $0.01<x<0.40$. The $z$-dependence of the multiplicity ratio is studied for $z>0.75$. For very large values of $z$, $i.e.$ $z>0.8$, we observe the kaon multiplicity ratio to fall below the lower limits expected from calculations based on leading and next-to-leading order perturbative quantum chromodynamics. Also, the kaon multiplicity ratio shows a strong dependence on the missing mass of the single-kaon production process. This suggests that within the perturbative quantum chromodynamics formalism an additional correction may be required, which takes into account the phase space available for hadronisation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.00584v2-abstract-full').style.display = 'none'; document.getElementById('1802.00584v2-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 October, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, 7 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2018-012 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1710.01014">arXiv:1710.01014</a> <span> [<a href="https://arxiv.org/pdf/1710.01014">pdf</a>, <a href="https://arxiv.org/format/1710.01014">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </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.2018.03.044">10.1016/j.physletb.2018.03.044 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Longitudinal double-spin asymmetry $A_1^{\rm p}$ and spin-dependent structure function $g_1^{\rm p}$ of the proton at small values of $x$ and $Q^2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Aghasyan%2C+M">M. Aghasyan</a>, <a href="/search/hep-ex?searchtype=author&query=Akhunzyanov%2C+R">R. Akhunzyanov</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anfimov%2C+N+V">N. V. Anfimov</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Antoshkin%2C+A">A. Antoshkin</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Austregesilo%2C+A">A. Austregesilo</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bicker%2C+K">K. Bicker</a>, <a href="/search/hep-ex?searchtype=author&query=Bielert%2C+E+R">E. R. Bielert</a>, <a href="/search/hep-ex?searchtype=author&query=Birsa%2C+R">R. Birsa</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a>, <a href="/search/hep-ex?searchtype=author&query=Bordalo%2C+P">P. Bordalo</a> , et al. (204 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="1710.01014v1-abstract-short" style="display: inline;"> We present a precise measurement of the proton longitudinal double-spin asymmetry $A_1^{\rm p}$ and the proton spin-dependent structure function $g_1^{\rm p}$ at photon virtualities $0.006~({\rm GeV}/c)^2<Q^2 < 1~({\rm GeV}/c)^2$ in the Bjorken $x$ range of $4 \times 10^{-5} < x < 4 \times 10^{-2}$. The results are based on data collected by the COMPASS Collaboration at CERN using muon beam energi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.01014v1-abstract-full').style.display = 'inline'; document.getElementById('1710.01014v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1710.01014v1-abstract-full" style="display: none;"> We present a precise measurement of the proton longitudinal double-spin asymmetry $A_1^{\rm p}$ and the proton spin-dependent structure function $g_1^{\rm p}$ at photon virtualities $0.006~({\rm GeV}/c)^2<Q^2 < 1~({\rm GeV}/c)^2$ in the Bjorken $x$ range of $4 \times 10^{-5} < x < 4 \times 10^{-2}$. The results are based on data collected by the COMPASS Collaboration at CERN using muon beam energies of $160~{\rm GeV}$ and $200~{\rm GeV}$. The statistical precision is more than tenfold better than that of the previous measurement in this region. In the whole range of $x$, the measured values of $A_1^{\rm p}$ and $g_1^{\rm p}$ are found to be positive. It is for the first time that spin effects are found at such low values of $x$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.01014v1-abstract-full').style.display = 'none'; document.getElementById('1710.01014v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 October, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">19 pages, 7 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2017-263 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1709.07374">arXiv:1709.07374</a> <span> [<a href="https://arxiv.org/pdf/1709.07374">pdf</a>, <a href="https://arxiv.org/format/1709.07374">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.97.032006">10.1103/PhysRevD.97.032006 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Transverse-momentum-dependent Multiplicities of Charged Hadrons in Muon-Deuteron Deep Inelastic Scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Aghasyan%2C+M">M. Aghasyan</a>, <a href="/search/hep-ex?searchtype=author&query=Akhunzyanov%2C+R">R. Akhunzyanov</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anfimov%2C+N+V">N. V. Anfimov</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Antoshkin%2C+A">A. Antoshkin</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Austregesilo%2C+A">A. Austregesilo</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bicker%2C+K">K. Bicker</a>, <a href="/search/hep-ex?searchtype=author&query=Bielert%2C+E+R">E. R. Bielert</a>, <a href="/search/hep-ex?searchtype=author&query=Birsa%2C+R">R. Birsa</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a>, <a href="/search/hep-ex?searchtype=author&query=Bordalo%2C+P">P. Bordalo</a> , et al. (206 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1709.07374v1-abstract-short" style="display: inline;"> A semi-inclusive measurement of charged hadron multiplicities in deep inelastic muon scattering off an isoscalar target was performed using data collected by the COMPASS Collaboration at CERN. The following kinematic domain is covered by the data: photon virtuality $Q^{2}>1$ (GeV/$c$)$^2$, invariant mass of the hadronic system $W > 5$ GeV/$c^2$, Bjorken scaling variable in the range… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1709.07374v1-abstract-full').style.display = 'inline'; document.getElementById('1709.07374v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1709.07374v1-abstract-full" style="display: none;"> A semi-inclusive measurement of charged hadron multiplicities in deep inelastic muon scattering off an isoscalar target was performed using data collected by the COMPASS Collaboration at CERN. The following kinematic domain is covered by the data: photon virtuality $Q^{2}>1$ (GeV/$c$)$^2$, invariant mass of the hadronic system $W > 5$ GeV/$c^2$, Bjorken scaling variable in the range $0.003 < x < 0.4$, fraction of the virtual photon energy carried by the hadron in the range $0.2 < z < 0.8$, square of the hadron transverse momentum with respect to the virtual photon direction in the range 0.02 (GeV/$c)^2 < P_{\rm{hT}}^{2} < 3$ (GeV/$c$)$^2$. The multiplicities are presented as a function of $P_{\rm{hT}}^{2}$ in three-dimensional bins of $x$, $Q^2$, $z$ and compared to previous semi-inclusive measurements. We explore the small-$P_{\rm{hT}}^{2}$ region, i.e. $P_{\rm{hT}}^{2} < 1$ (GeV/$c$)$^2$, where hadron transverse momenta are expected to arise from non-perturbative effects, and also the domain of larger $P_{\rm{hT}}^{2}$, where contributions from higher-order perturbative QCD are expected to dominate. The multiplicities are fitted using a single-exponential function at small $P_{\rm{hT}}^{2}$ to study the dependence of the average transverse momentum $\langle P_{\rm{hT}}^{2}\rangle$ on $x$, $Q^2$ and $z$. The power-law behaviour of the multiplicities at large $P_{\rm{hT}}^{2}$ is investigated using various functional forms. The fits describe the data reasonably well over the full measured range. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1709.07374v1-abstract-full').style.display = 'none'; document.getElementById('1709.07374v1-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 September, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">28 pages, 20 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2017-253 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 97, 032006 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1707.02848">arXiv:1707.02848</a> <span> [<a href="https://arxiv.org/pdf/1707.02848">pdf</a>, <a href="https://arxiv.org/format/1707.02848">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> </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.2018.01.017">10.1016/j.physletb.2018.01.017 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> New analysis of $畏蟺$ tensor resonances measured at the COMPASS experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Jackura%2C+A">A. Jackura</a>, <a href="/search/hep-ex?searchtype=author&query=Fernandez-Ramirez%2C+C">C. Fernandez-Ramirez</a>, <a href="/search/hep-ex?searchtype=author&query=Mikhasenko%2C+M">M. Mikhasenko</a>, <a href="/search/hep-ex?searchtype=author&query=Pilloni%2C+A">A. Pilloni</a>, <a href="/search/hep-ex?searchtype=author&query=Mathieu%2C+V">V. Mathieu</a>, <a href="/search/hep-ex?searchtype=author&query=Nys%2C+J">J. Nys</a>, <a href="/search/hep-ex?searchtype=author&query=Pauk%2C+V">V. Pauk</a>, <a href="/search/hep-ex?searchtype=author&query=Szczepaniak%2C+A+P">A. P. Szczepaniak</a>, <a href="/search/hep-ex?searchtype=author&query=Fox%2C+G">G. Fox</a>, <a href="/search/hep-ex?searchtype=author&query=Aghasyan%2C+M">M. Aghasyan</a>, <a href="/search/hep-ex?searchtype=author&query=Akhunzyanov%2C+R">R. Akhunzyanov</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anfimov%2C+N+V">N. V. Anfimov</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Antoshkin%2C+A">A. Antoshkin</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Austregesilo%2C+A">A. Austregesilo</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a> , et al. (212 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1707.02848v1-abstract-short" style="display: inline;"> We present a new amplitude analysis of the $畏蟺$ $D$-wave in $蟺^- p\to 畏蟺^- p$ measured by COMPASS. Employing an analytical model based on the principles of the relativistic $S$-matrix, we find two resonances that can be identified with the $a_2(1320)$ and the excited $a_2^\prime(1700)$, and perform a comprehensive analysis of their pole positions. For the mass and width of the $a_2$ we find… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1707.02848v1-abstract-full').style.display = 'inline'; document.getElementById('1707.02848v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1707.02848v1-abstract-full" style="display: none;"> We present a new amplitude analysis of the $畏蟺$ $D$-wave in $蟺^- p\to 畏蟺^- p$ measured by COMPASS. Employing an analytical model based on the principles of the relativistic $S$-matrix, we find two resonances that can be identified with the $a_2(1320)$ and the excited $a_2^\prime(1700)$, and perform a comprehensive analysis of their pole positions. For the mass and width of the $a_2$ we find $M=(1307 \pm 1 \pm 6)$~MeV and $螕=(112 \pm 1 \pm 8)$~MeV, and for the excited state $a_2^\prime$ we obtain $M=(1720 \pm 10 \pm 60)$~MeV and $螕=(280\pm 10 \pm 70)$~MeV, respectively. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1707.02848v1-abstract-full').style.display = 'none'; document.getElementById('1707.02848v1-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 July, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2017-169 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1707.01796">arXiv:1707.01796</a> <span> [<a href="https://arxiv.org/pdf/1707.01796">pdf</a>, <a href="https://arxiv.org/format/1707.01796">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </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.2018.07.008">10.1016/j.physletb.2018.07.008 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for muoproduction of $X(3872)$ at COMPASS and indication of a new state $\widetilde{X}(3872)$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Aghasyan%2C+M">M. Aghasyan</a>, <a href="/search/hep-ex?searchtype=author&query=Akhunzyanov%2C+R">R. Akhunzyanov</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anfimov%2C+N+V">N. V. Anfimov</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Antoshkin%2C+A">A. Antoshkin</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Austregesilo%2C+A">A. Austregesilo</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bicker%2C+K">K. Bicker</a>, <a href="/search/hep-ex?searchtype=author&query=Bielert%2C+E+R">E. R. Bielert</a>, <a href="/search/hep-ex?searchtype=author&query=Birsa%2C+R">R. Birsa</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a>, <a href="/search/hep-ex?searchtype=author&query=Bordalo%2C+P">P. Bordalo</a> , et al. (203 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1707.01796v2-abstract-short" style="display: inline;"> We have searched for exclusive production of exotic charmonia in the reaction $渭^+~N \rightarrow 渭^+ (J\!/\!蠄蟺^+蟺^-)蟺^{\pm}~N'$ using COMPASS data collected with incoming muons of 160 GeV/$c$ and 200 GeV/$c$ momentum. In the $J\!/\!蠄蟺^+蟺^-$ mass distribution we observe a signal with a statistical significance of 4.1 $蟽$. Its mass and width are consistent with those of the $X(3872)$. The shape of t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1707.01796v2-abstract-full').style.display = 'inline'; document.getElementById('1707.01796v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1707.01796v2-abstract-full" style="display: none;"> We have searched for exclusive production of exotic charmonia in the reaction $渭^+~N \rightarrow 渭^+ (J\!/\!蠄蟺^+蟺^-)蟺^{\pm}~N'$ using COMPASS data collected with incoming muons of 160 GeV/$c$ and 200 GeV/$c$ momentum. In the $J\!/\!蠄蟺^+蟺^-$ mass distribution we observe a signal with a statistical significance of 4.1 $蟽$. Its mass and width are consistent with those of the $X(3872)$. The shape of the $蟺^+蟺^-$ mass distribution from the observed decay into $J\!/\!蠄蟺^+蟺^-$ shows disagreement with previous observations for $X(3872)$. The observed signal may be interpreted as a possible evidence of a new charmonium state. It could be associated with a neutral partner of $X(3872)$ with $C = -1$ predicted by a tetraquark model. The product of cross section and branching fraction of the decay of the observed state into $J\!/\!蠄蟺^+蟺^-$ is determined to be 71$\pm$28(stat)$\pm$39(syst) pb. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1707.01796v2-abstract-full').style.display = 'none'; document.getElementById('1707.01796v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 July, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 July, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">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">Report number:</span> CERN-EP-2017-165 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1704.00488">arXiv:1704.00488</a> <span> [<a href="https://arxiv.org/pdf/1704.00488">pdf</a>, <a href="https://arxiv.org/format/1704.00488">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </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.119.112002">10.1103/PhysRevLett.119.112002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First measurement of transverse-spin-dependent azimuthal asymmetries in the Drell-Yan process </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Aghasyan"> Aghasyan</a>, <a href="/search/hep-ex?searchtype=author&query=Akhunzyanov%2C+R">R. Akhunzyanov</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anfimov%2C+N+V">N. V. Anfimov</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Antoshkin%2C+A">A. Antoshkin</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Austregesilo%2C+A">A. Austregesilo</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bicker%2C+K">K. Bicker</a>, <a href="/search/hep-ex?searchtype=author&query=Bielert%2C+E+R">E. R. Bielert</a>, <a href="/search/hep-ex?searchtype=author&query=Birsa%2C+R">R. Birsa</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a>, <a href="/search/hep-ex?searchtype=author&query=Bordalo%2C+P">P. Bordalo</a> , et al. (195 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="1704.00488v1-abstract-short" style="display: inline;"> The first measurement of transverse-spin-dependent azimuthal asymmetries in the pion-induced Drell-Yan (DY) process is reported. We use the CERN SPS 190 GeV/$c$, $蟺^{-}$ beam and a transversely polarized ammonia target. Three azimuthal asymmetries giving access to different transverse-momentum-dependent (TMD) parton distribution functions (PDFs) are extracted using dimuon events with invariant mas… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1704.00488v1-abstract-full').style.display = 'inline'; document.getElementById('1704.00488v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1704.00488v1-abstract-full" style="display: none;"> The first measurement of transverse-spin-dependent azimuthal asymmetries in the pion-induced Drell-Yan (DY) process is reported. We use the CERN SPS 190 GeV/$c$, $蟺^{-}$ beam and a transversely polarized ammonia target. Three azimuthal asymmetries giving access to different transverse-momentum-dependent (TMD) parton distribution functions (PDFs) are extracted using dimuon events with invariant mass between 4.3 GeV/$c^2$ and 8.5 GeV/$c^2$. The observed sign of the Sivers asymmetry is found to be consistent with the fundamental prediction of Quantum Chromodynamics (QCD) that the Sivers TMD PDFs extracted from DY have a sign opposite to the one extracted from semi-inclusive deep-inelastic scattering (SIDIS) data. We present two other asymmetries originating from the pion Boer-Mulders TMD PDFs convoluted with either the nucleon transversity or pretzelosity TMD PDFs. These DY results are obtained at a hard scale comparable to that of a recent COMPASS SIDIS measurement and hence allow unique tests of fundamental QCD universality predictions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1704.00488v1-abstract-full').style.display = 'none'; document.getElementById('1704.00488v1-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 April, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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">11 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2017-059 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 119, 112002 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1702.05093">arXiv:1702.05093</a> <span> [<a href="https://arxiv.org/pdf/1702.05093">pdf</a>, <a href="https://arxiv.org/format/1702.05093">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2017.05.027">10.1016/j.nima.2017.05.027 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Large Ungated TPC with GEM Amplification </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Berger%2C+M">M. Berger</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Fabbietti%2C+L">L. Fabbietti</a>, <a href="/search/hep-ex?searchtype=author&query=Ketzer%2C+B">B. Ketzer</a>, <a href="/search/hep-ex?searchtype=author&query=Arora%2C+R">R. Arora</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=B%C3%B6hmer%2C+F">F. B枚hmer</a>, <a href="/search/hep-ex?searchtype=author&query=Chen%2C+J+-">J. -C. Chen</a>, <a href="/search/hep-ex?searchtype=author&query=Cusanno%2C+F">F. Cusanno</a>, <a href="/search/hep-ex?searchtype=author&query=D%C3%B8rheim%2C+S">S. D酶rheim</a>, <a href="/search/hep-ex?searchtype=author&query=Hehner%2C+J">J. Hehner</a>, <a href="/search/hep-ex?searchtype=author&query=Herrmann%2C+N">N. Herrmann</a>, <a href="/search/hep-ex?searchtype=author&query=H%C3%B6ppner%2C+C">C. H枚ppner</a>, <a href="/search/hep-ex?searchtype=author&query=Kaiser%2C+D">D. Kaiser</a>, <a href="/search/hep-ex?searchtype=author&query=Kis%2C+M">M. Kis</a>, <a href="/search/hep-ex?searchtype=author&query=Kleipa%2C+V">V. Kleipa</a>, <a href="/search/hep-ex?searchtype=author&query=Konorov%2C+I">I. Konorov</a>, <a href="/search/hep-ex?searchtype=author&query=Kunkel%2C+J">J. Kunkel</a>, <a href="/search/hep-ex?searchtype=author&query=Kurz%2C+N">N. Kurz</a>, <a href="/search/hep-ex?searchtype=author&query=Leifels%2C+Y">Y. Leifels</a>, <a href="/search/hep-ex?searchtype=author&query=M%C3%BCllner%2C+P">P. M眉llner</a>, <a href="/search/hep-ex?searchtype=author&query=M%C3%BCnzer%2C+R">R. M眉nzer</a>, <a href="/search/hep-ex?searchtype=author&query=Neubert%2C+S">S. Neubert</a>, <a href="/search/hep-ex?searchtype=author&query=Rauch%2C+J">J. Rauch</a>, <a href="/search/hep-ex?searchtype=author&query=Schmidt%2C+C+J">C. J. Schmidt</a> , et al. (6 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1702.05093v1-abstract-short" style="display: inline;"> A Time Projection Chamber (TPC) is an ideal device for the detection of charged particle tracks in a large volume covering a solid angle of almost $4蟺$. The high density of hits on a given particle track facilitates the task of pattern recognition in a high-occupancy environment and in addition provides particle identification by measuring the specific energy loss for each track. For these reasons… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1702.05093v1-abstract-full').style.display = 'inline'; document.getElementById('1702.05093v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1702.05093v1-abstract-full" style="display: none;"> A Time Projection Chamber (TPC) is an ideal device for the detection of charged particle tracks in a large volume covering a solid angle of almost $4蟺$. The high density of hits on a given particle track facilitates the task of pattern recognition in a high-occupancy environment and in addition provides particle identification by measuring the specific energy loss for each track. For these reasons, TPCs with Multiwire Proportional Chamber (MWPC) amplification have been and are widely used in experiments recording heavy-ion collisions. A significant drawback, however, is the large dead time of the order of 1 ms per event generated by the use of a gating grid, which is mandatory to prevent ions created in the amplification region from drifting back into the drift volume, where they would severely distort the drift path of subsequent tracks. For experiments with higher event rates this concept of a conventional TPC operating with a triggered gating grid can therefore not be applied without a significant loss of data. A continuous readout of the signals is the more appropriate way of operation. This, however, constitutes a change of paradigm with considerable challenges to be met concerning the amplification region, the design and bandwidth of the readout electronics, and the data handling. A mandatory prerequisite for such an operation is a sufficiently good suppression of the ion backflow from the avalanche region, which otherwise limits the tracking and particle identification capabilities of such a detector. Gas Electron Multipliers (GEM) are a promising candidate to combine excellent spatial resolution with an intrinsic suppression of ions. In this paper we describe the design, construction and the commissioning of a large TPC with GEM amplification and without gating grid (GEM-TPC). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1702.05093v1-abstract-full').style.display = 'none'; document.getElementById('1702.05093v1-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 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">73 pages, 55 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/1701.02453">arXiv:1701.02453</a> <span> [<a href="https://arxiv.org/pdf/1701.02453">pdf</a>, <a href="https://arxiv.org/format/1701.02453">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </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.2017.07.018">10.1016/j.physletb.2017.07.018 <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 Sivers asymmetry for gluons from SIDIS data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Adolph%2C+C">C. Adolph</a>, <a href="/search/hep-ex?searchtype=author&query=Aghasyan%2C+M">M. Aghasyan</a>, <a href="/search/hep-ex?searchtype=author&query=Akhunzyanov%2C+R">R. Akhunzyanov</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anfimov%2C+N+V">N. V. Anfimov</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Antoshkin%2C+A">A. Antoshkin</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Austregesilo%2C+A">A. Austregesilo</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bicker%2C+K">K. Bicker</a>, <a href="/search/hep-ex?searchtype=author&query=Bielert%2C+E+R">E. R. Bielert</a>, <a href="/search/hep-ex?searchtype=author&query=Birsa%2C+R">R. Birsa</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a> , et al. (202 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="1701.02453v1-abstract-short" style="display: inline;"> The Sivers function describes the correlation between the transverse spin of a nucleon and the transverse motion of its partons. It was extracted from measurements of the azimuthal asymmetry of hadrons produced in semi-inclusive deep inelastic scattering of leptons off transversely polarised nucleon targets, and it turned out to be non-zero for quarks. In this letter the evaluation of the Sivers a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1701.02453v1-abstract-full').style.display = 'inline'; document.getElementById('1701.02453v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1701.02453v1-abstract-full" style="display: none;"> The Sivers function describes the correlation between the transverse spin of a nucleon and the transverse motion of its partons. It was extracted from measurements of the azimuthal asymmetry of hadrons produced in semi-inclusive deep inelastic scattering of leptons off transversely polarised nucleon targets, and it turned out to be non-zero for quarks. In this letter the evaluation of the Sivers asymmetry for gluons in the same process is presented. The analysis method is based on a Monte Carlo simulation that includes three hard processes: photon-gluon fusion, QCD Compton scattering and leading-order virtual-photon absorption process. The Sivers asymmetries of the three processes are simultaneously extracted using the LEPTO event generator and a neural network approach. The method is applied to samples of events containing at least two hadrons with large transverse momentum from the COMPASS data taken with a 160 GeV/$c$ muon beam scattered off transversely polarised deuterons and protons. With a significance of more than two standard deviations a negative value is obtained for the gluon Sivers asymmetry. The result of a similar analysis for a Collins-like asymmetry for gluons is consistent with zero. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1701.02453v1-abstract-full').style.display = 'none'; document.getElementById('1701.02453v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 January, 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">18 pages, 8 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2017-003 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1612.00620">arXiv:1612.00620</a> <span> [<a href="https://arxiv.org/pdf/1612.00620">pdf</a>, <a href="https://arxiv.org/format/1612.00620">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </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.2017.03.018">10.1016/j.physletb.2017.03.018 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Final COMPASS results on the deuteron spin-dependent structure function $g_1^{\rm d}$ and the Bjorken sum rule </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Adolph%2C+C">C. Adolph</a>, <a href="/search/hep-ex?searchtype=author&query=Aghasyan%2C+M">M. Aghasyan</a>, <a href="/search/hep-ex?searchtype=author&query=Akhunzyanov%2C+R">R. Akhunzyanov</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anfimov%2C+N+V">N. V. Anfimov</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Austregesilo%2C+A">A. Austregesilo</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bicker%2C+K">K. Bicker</a>, <a href="/search/hep-ex?searchtype=author&query=Bielert%2C+E+R">E. R. Bielert</a>, <a href="/search/hep-ex?searchtype=author&query=Birsa%2C+R">R. Birsa</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a>, <a href="/search/hep-ex?searchtype=author&query=Bordalo%2C+P">P. Bordalo</a> , et al. (202 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="1612.00620v1-abstract-short" style="display: inline;"> Final results are presented from the inclusive measurement of deep-inelastic polarised-muon scattering on longitudinally polarised deuterons using a $^6$LiD target. The data were taken at $160~{\rm GeV}$ beam energy and the results are shown for the kinematic range $1~({\rm GeV}/c)^2 < Q^2 < 100~({\rm GeV}/c)^2$ in photon virtuality, $0.004<x<0.7$ in the Bjorken scaling variable and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1612.00620v1-abstract-full').style.display = 'inline'; document.getElementById('1612.00620v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1612.00620v1-abstract-full" style="display: none;"> Final results are presented from the inclusive measurement of deep-inelastic polarised-muon scattering on longitudinally polarised deuterons using a $^6$LiD target. The data were taken at $160~{\rm GeV}$ beam energy and the results are shown for the kinematic range $1~({\rm GeV}/c)^2 < Q^2 < 100~({\rm GeV}/c)^2$ in photon virtuality, $0.004<x<0.7$ in the Bjorken scaling variable and $W > 4~{\rm GeV}/c^2$ in the mass of the hadronic final state. The deuteron double-spin asymmetry $A_1^{\rm d}$ and the deuteron longitudinal-spin structure function $g_1^{\rm d}$ are presented in bins of $x$ and $Q^2$. Towards lowest accessible values of $x$, $g_1^{\rm d}$ decreases and becomes consistent with zero within uncertainties. The presented final $g_1^{\rm d}$ values together with the recently published final $g_1^{\rm p}$ values of COMPASS are used to again evaluate the Bjorken sum rule and perform the QCD fit to the $g_1$ world data at next-to-leading order of the strong coupling constant. In both cases, changes in central values of the resulting numbers are well within statistical uncertainties. The flavour-singlet axial charge $a_0$, {which is identified in the $\overline{\rm MS}$ renormalisation scheme with the total contribution of quark helicities to the nucleon spin}, is extracted from only the COMPASS deuteron data with negligible extrapolation uncertainty: $a_0 (Q^2 = 3~({\rm GeV}/c)^2) = 0.32 \pm 0.02_{\rm stat} \pm0.04_{\rm syst} \pm 0.05_{\rm evol}$. Together with the recent results on the proton spin structure function $g_1^{\rm p}$, the results on $g_1^{\rm d}$ constitute the COMPASS legacy on the measurements of $g_1$ through inclusive spin-dependent deep inelastic scattering. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1612.00620v1-abstract-full').style.display = 'none'; document.getElementById('1612.00620v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 December, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">16 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2016-299 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1610.02149">arXiv:1610.02149</a> <span> [<a href="https://arxiv.org/pdf/1610.02149">pdf</a>, <a href="https://arxiv.org/format/1610.02149">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="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.95.032003">10.1103/PhysRevD.95.032003 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Feasibility study for the measurement of $蟺N$ TDAs at PANDA in $\bar{p}p\to J/蠄蟺^0$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=PANDA+Collaboration"> PANDA Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Singh%2C+B">B. Singh</a>, <a href="/search/hep-ex?searchtype=author&query=Erni%2C+W">W. Erni</a>, <a href="/search/hep-ex?searchtype=author&query=Krusche%2C+B">B. Krusche</a>, <a href="/search/hep-ex?searchtype=author&query=Steinacher%2C+M">M. Steinacher</a>, <a href="/search/hep-ex?searchtype=author&query=Walford%2C+N">N. Walford</a>, <a href="/search/hep-ex?searchtype=author&query=Liu%2C+H">H. Liu</a>, <a href="/search/hep-ex?searchtype=author&query=Liu%2C+Z">Z. Liu</a>, <a href="/search/hep-ex?searchtype=author&query=Liu%2C+B">B. Liu</a>, <a href="/search/hep-ex?searchtype=author&query=Shen%2C+X">X. Shen</a>, <a href="/search/hep-ex?searchtype=author&query=Wang%2C+C">C. Wang</a>, <a href="/search/hep-ex?searchtype=author&query=Zhao%2C+J">J. Zhao</a>, <a href="/search/hep-ex?searchtype=author&query=Albrecht%2C+M">M. Albrecht</a>, <a href="/search/hep-ex?searchtype=author&query=Erlen%2C+T">T. Erlen</a>, <a href="/search/hep-ex?searchtype=author&query=Fink%2C+M">M. Fink</a>, <a href="/search/hep-ex?searchtype=author&query=Heinsius%2C+F+H">F. H. Heinsius</a>, <a href="/search/hep-ex?searchtype=author&query=Held%2C+T">T. Held</a>, <a href="/search/hep-ex?searchtype=author&query=Holtmann%2C+T">T. Holtmann</a>, <a href="/search/hep-ex?searchtype=author&query=Jasper%2C+S">S. Jasper</a>, <a href="/search/hep-ex?searchtype=author&query=Keshk%2C+I">I. Keshk</a>, <a href="/search/hep-ex?searchtype=author&query=Koch%2C+H">H. Koch</a>, <a href="/search/hep-ex?searchtype=author&query=Kopf%2C+B">B. Kopf</a>, <a href="/search/hep-ex?searchtype=author&query=Kuhlmann%2C+M">M. Kuhlmann</a>, <a href="/search/hep-ex?searchtype=author&query=K%C3%BCmmel%2C+M">M. K眉mmel</a>, <a href="/search/hep-ex?searchtype=author&query=Leiber%2C+S">S. Leiber</a> , et al. (488 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="1610.02149v1-abstract-short" style="display: inline;"> The exclusive charmonium production process in $\bar{p}p$ annihilation with an associated $蟺^0$ meson $\bar{p}p\to J/蠄蟺^0$ is studied in the framework of QCD collinear factorization. The feasibility of measuring this reaction through the $J/蠄\to e^+e^-$ decay channel with the PANDA (AntiProton ANnihilation at DArmstadt) experiment is investigated. Simulations on signal reconstruction efficiency as… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.02149v1-abstract-full').style.display = 'inline'; document.getElementById('1610.02149v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1610.02149v1-abstract-full" style="display: none;"> The exclusive charmonium production process in $\bar{p}p$ annihilation with an associated $蟺^0$ meson $\bar{p}p\to J/蠄蟺^0$ is studied in the framework of QCD collinear factorization. The feasibility of measuring this reaction through the $J/蠄\to e^+e^-$ decay channel with the PANDA (AntiProton ANnihilation at DArmstadt) experiment is investigated. Simulations on signal reconstruction efficiency as well as the background rejection from various sources including the $\bar{p}p\to蟺^+蟺^-蟺^0$ and $\bar{p}p\to J/蠄蟺^0蟺^0$ reactions are performed with PandaRoot, the simulation and analysis software framework of the PANDA experiment. It is shown that the measurement can be done at PANDA with significant constraining power under the assumption of an integrated luminosity attainable in four to five months of data taking at the maximum design luminosity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.02149v1-abstract-full').style.display = 'none'; document.getElementById('1610.02149v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 October, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">25 pages, 22 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 95, 032003 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1609.07374">arXiv:1609.07374</a> <span> [<a href="https://arxiv.org/pdf/1609.07374">pdf</a>, <a href="https://arxiv.org/format/1609.07374">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </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.2017.04.042">10.1016/j.physletb.2017.04.042 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Sivers asymmetry extracted in SIDIS at the hard scale of the Drell-Yan process at COMPASS </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Adolph%2C+C">C. Adolph</a>, <a href="/search/hep-ex?searchtype=author&query=Aghasyan%2C+M">M. Aghasyan</a>, <a href="/search/hep-ex?searchtype=author&query=Akhunzyanov%2C+R">R. Akhunzyanov</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anfimov%2C+N+V">N. V. Anfimov</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Austregesilo%2C+A">A. Austregesilo</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bicker%2C+K">K. Bicker</a>, <a href="/search/hep-ex?searchtype=author&query=Bielert%2C+E+R">E. R. Bielert</a>, <a href="/search/hep-ex?searchtype=author&query=Birsa%2C+R">R. Birsa</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a>, <a href="/search/hep-ex?searchtype=author&query=Bordalo%2C+P">P. Bordalo</a> , et al. (202 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="1609.07374v2-abstract-short" style="display: inline;"> Proton transverse-spin azimuthal asymmetries are extracted from the COMPASS 2010 semi-inclusive hadron measurements in deep inelastic muon-nucleon scattering in those four regions of the photon virtuality $Q^2$, which correspond to the four regions of the di-muon mass $\sqrt{Q^2}$ used in the ongoing analysis of the COMPASS Drell-Yan measurements. This allows for a future direct comparison of the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.07374v2-abstract-full').style.display = 'inline'; document.getElementById('1609.07374v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1609.07374v2-abstract-full" style="display: none;"> Proton transverse-spin azimuthal asymmetries are extracted from the COMPASS 2010 semi-inclusive hadron measurements in deep inelastic muon-nucleon scattering in those four regions of the photon virtuality $Q^2$, which correspond to the four regions of the di-muon mass $\sqrt{Q^2}$ used in the ongoing analysis of the COMPASS Drell-Yan measurements. This allows for a future direct comparison of the nucleon transverse-momentum-dependent parton distribution functions extracted from these two alternative measurements. Various two-dimensional kinematic dependences are presented for the azimuthal asymmetries induced by the Sivers transverse-momentum-dependent parton distribution function. The integrated Sivers asymmetries are found to be positive with an accuracy that appears to be sufficient to test the sign change of the Sivers function predicted by Quantum Chromodynamics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.07374v2-abstract-full').style.display = 'none'; document.getElementById('1609.07374v2-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 July, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 September, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 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">13 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2016--250 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1609.06062">arXiv:1609.06062</a> <span> [<a href="https://arxiv.org/pdf/1609.06062">pdf</a>, <a href="https://arxiv.org/format/1609.06062">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </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/epjc/s10052-018-6379-7">10.1140/epjc/s10052-018-6379-7 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Azimuthal asymmetries of charged hadrons produced in high-energy muon scattering off longitudinally polarised deuterons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Adolph%2C+C">C. Adolph</a>, <a href="/search/hep-ex?searchtype=author&query=Aghasyan%2C+M">M. Aghasyan</a>, <a href="/search/hep-ex?searchtype=author&query=Akhunzyanov%2C+R">R. Akhunzyanov</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anfimov%2C+N+V">N. V. Anfimov</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Austregesilo%2C+A">A. Austregesilo</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bicker%2C+K">K. Bicker</a>, <a href="/search/hep-ex?searchtype=author&query=Bielert%2C+E+R">E. R. Bielert</a>, <a href="/search/hep-ex?searchtype=author&query=Birsa%2C+R">R. Birsa</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a>, <a href="/search/hep-ex?searchtype=author&query=Bordalo%2C+P">P. Bordalo</a> , et al. (200 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="1609.06062v2-abstract-short" style="display: inline;"> Single hadron azimuthal asymmetries of positive and negative hadrons produced in muon semi-inclusive deep inelastic scattering off longitudinally polarised deuterons are determined using the 2006 COMPASS data and also combined all deuteron COMPASS data. For each hadron charge, the dependence of the azimuthal asymmetry on the hadron azimuthal angle $蠁$ is obtained by means of a five-parameter fitti… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.06062v2-abstract-full').style.display = 'inline'; document.getElementById('1609.06062v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1609.06062v2-abstract-full" style="display: none;"> Single hadron azimuthal asymmetries of positive and negative hadrons produced in muon semi-inclusive deep inelastic scattering off longitudinally polarised deuterons are determined using the 2006 COMPASS data and also combined all deuteron COMPASS data. For each hadron charge, the dependence of the azimuthal asymmetry on the hadron azimuthal angle $蠁$ is obtained by means of a five-parameter fitting function that besides a $蠁$-independent term includes four modulations predicted by theory: $\sin蠁$, $\sin 2 蠁$, $\sin 3蠁$ and $\cos蠁$. The amplitudes of the five terms have been extracted, first, for the hadrons in the whole available kinematic region. In further fits, performed for hadrons from a restricted kinematic region, the $蠁$-dependence is determined as a function of one of three variables (Bjorken-$x$, fractional energy of virtual photon taken by the outgoing hadron and hadron transverse momentum), while disregarding the others. Except the $蠁$-independent term, all the modulation amplitudes are very small, and no clear kinematic dependence could be observed within experimental uncertainties. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.06062v2-abstract-full').style.display = 'none'; document.getElementById('1609.06062v2-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, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 September, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 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">15 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2016-245 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Published in Eur.Phys.J. C78 (2018) no.11, 952 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1608.06760">arXiv:1608.06760</a> <span> [<a href="https://arxiv.org/pdf/1608.06760">pdf</a>, <a href="https://arxiv.org/format/1608.06760">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2017.01.053">10.1016/j.physletb.2017.01.053 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Multiplicities of charged kaons from deep-inelastic muon scattering off an isoscalar target </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Adolph%2C+C">C. Adolph</a>, <a href="/search/hep-ex?searchtype=author&query=Agarwala%2C+J">J. Agarwala</a>, <a href="/search/hep-ex?searchtype=author&query=Aghasyan%2C+M">M. Aghasyan</a>, <a href="/search/hep-ex?searchtype=author&query=Akhunzyanov%2C+R">R. Akhunzyanov</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Andrieux%2C+V">V. Andrieux</a>, <a href="/search/hep-ex?searchtype=author&query=Anfimov%2C+N+V">N. V. Anfimov</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V">V. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Augsten%2C+K">K. Augsten</a>, <a href="/search/hep-ex?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/hep-ex?searchtype=author&query=Austregesilo%2C+A">A. Austregesilo</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Badelek%2C+B">B. Badelek</a>, <a href="/search/hep-ex?searchtype=author&query=Balestra%2C+F">F. Balestra</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Barth%2C+J">J. Barth</a>, <a href="/search/hep-ex?searchtype=author&query=Beck%2C+R">R. Beck</a>, <a href="/search/hep-ex?searchtype=author&query=Bedfer%2C+Y">Y. Bedfer</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bicker%2C+K">K. Bicker</a>, <a href="/search/hep-ex?searchtype=author&query=Bielert%2C+E+R">E. R. Bielert</a>, <a href="/search/hep-ex?searchtype=author&query=Birsa%2C+R">R. Birsa</a>, <a href="/search/hep-ex?searchtype=author&query=Bodlak%2C+M">M. Bodlak</a> , et al. (202 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1608.06760v1-abstract-short" style="display: inline;"> Precise measurements of charged-kaon multiplicities in deep inelastic scattering were performed. The results are presented in three-dimensional bins of the Bjorken scaling variable x, the relative virtual-photon energy y, and the fraction z of the virtual-photon energy carried by the produced hadron. The data were obtained by the COMPASS Collaboration by scattering 160 GeV muons off an isoscalar 6… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.06760v1-abstract-full').style.display = 'inline'; document.getElementById('1608.06760v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1608.06760v1-abstract-full" style="display: none;"> Precise measurements of charged-kaon multiplicities in deep inelastic scattering were performed. The results are presented in three-dimensional bins of the Bjorken scaling variable x, the relative virtual-photon energy y, and the fraction z of the virtual-photon energy carried by the produced hadron. The data were obtained by the COMPASS Collaboration by scattering 160 GeV muons off an isoscalar 6 LiD target. They cover the kinematic domain 1 (GeV/c)2 < Q2 < 60 (GeV/c)^2 in the photon virtuality, 0.004 < x < 0.4, 0.1 < y < 0.7, 0.20 < z < 0.85, and W > 5 GeV/c^2 in the invariant mass of the hadronic system. The results from the sum of the z-integrated K+ and K- multiplicities at high x point to a value of the non-strange quark fragmentation function larger than obtained by the earlier DSS fit. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.06760v1-abstract-full').style.display = 'none'; document.getElementById('1608.06760v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 August, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 9 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2016--206 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1606.01118">arXiv:1606.01118</a> <span> [<a href="https://arxiv.org/pdf/1606.01118">pdf</a>, <a href="https://arxiv.org/ps/1606.01118">ps</a>, <a href="https://arxiv.org/format/1606.01118">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Feasibility studies of time-like proton electromagnetic form factors at PANDA at FAIR </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=PANDA+Collaboration"> PANDA Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Singh%2C+B">B. Singh</a>, <a href="/search/hep-ex?searchtype=author&query=Erni%2C+W">W. Erni</a>, <a href="/search/hep-ex?searchtype=author&query=Krusche%2C+B">B. Krusche</a>, <a href="/search/hep-ex?searchtype=author&query=Steinacher%2C+M">M. Steinacher</a>, <a href="/search/hep-ex?searchtype=author&query=Walford%2C+N">N. Walford</a>, <a href="/search/hep-ex?searchtype=author&query=Liu%2C+B">B. Liu</a>, <a href="/search/hep-ex?searchtype=author&query=Liu%2C+H">H. Liu</a>, <a href="/search/hep-ex?searchtype=author&query=Liu%2C+Z">Z. Liu</a>, <a href="/search/hep-ex?searchtype=author&query=Shen%2C+X">X. Shen</a>, <a href="/search/hep-ex?searchtype=author&query=Wang%2C+C">C. Wang</a>, <a href="/search/hep-ex?searchtype=author&query=Zhao%2C+J">J. Zhao</a>, <a href="/search/hep-ex?searchtype=author&query=Albrecht%2C+M">M. Albrecht</a>, <a href="/search/hep-ex?searchtype=author&query=Erlen%2C+T">T. Erlen</a>, <a href="/search/hep-ex?searchtype=author&query=Fink%2C+M">M. Fink</a>, <a href="/search/hep-ex?searchtype=author&query=Heinsius%2C+F">F. Heinsius</a>, <a href="/search/hep-ex?searchtype=author&query=Held%2C+T">T. Held</a>, <a href="/search/hep-ex?searchtype=author&query=Holtmann%2C+T">T. Holtmann</a>, <a href="/search/hep-ex?searchtype=author&query=Jasper%2C+S">S. Jasper</a>, <a href="/search/hep-ex?searchtype=author&query=Keshk%2C+I">I. Keshk</a>, <a href="/search/hep-ex?searchtype=author&query=Koch%2C+H">H. Koch</a>, <a href="/search/hep-ex?searchtype=author&query=Kopf%2C+B">B. Kopf</a>, <a href="/search/hep-ex?searchtype=author&query=Kuhlmann%2C+M">M. Kuhlmann</a>, <a href="/search/hep-ex?searchtype=author&query=K%C3%BCmmel%2C+M">M. K眉mmel</a>, <a href="/search/hep-ex?searchtype=author&query=Leiber%2C+S">S. Leiber</a> , et al. (482 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1606.01118v2-abstract-short" style="display: inline;"> Simulation results for future measurements of electromagnetic proton form factors at \PANDA (FAIR) within the PandaRoot software framework are reported. The statistical precision with which the proton form factors can be determined is estimated. The signal channel $\bar p p \to e^+ e^-$ is studied on the basis of two different but consistent procedures. The suppression of the main background chann… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1606.01118v2-abstract-full').style.display = 'inline'; document.getElementById('1606.01118v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1606.01118v2-abstract-full" style="display: none;"> Simulation results for future measurements of electromagnetic proton form factors at \PANDA (FAIR) within the PandaRoot software framework are reported. The statistical precision with which the proton form factors can be determined is estimated. The signal channel $\bar p p \to e^+ e^-$ is studied on the basis of two different but consistent procedures. The suppression of the main background channel, $\textit{i.e.}$ $\bar p p \to 蟺^+ 蟺^-$, is studied. Furthermore, the background versus signal efficiency, statistical and systematical uncertainties on the extracted proton form factors are evaluated using two different procedures. The results are consistent with those of a previous simulation study using an older, simplified framework. However, a slightly better precision is achieved in the PandaRoot study in a large range of momentum transfer, assuming the nominal beam conditions and detector performance. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1606.01118v2-abstract-full').style.display = 'none'; document.getElementById('1606.01118v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 September, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 3 June, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2016. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1501.05241">arXiv:1501.05241</a> <span> [<a href="https://arxiv.org/pdf/1501.05241">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Mu2e Technical Design Report </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Bartoszek%2C+L">L. Bartoszek</a>, <a href="/search/hep-ex?searchtype=author&query=Barnes%2C+E">E. Barnes</a>, <a href="/search/hep-ex?searchtype=author&query=Miller%2C+J+P">J. P. Miller</a>, <a href="/search/hep-ex?searchtype=author&query=Mott%2C+J">J. Mott</a>, <a href="/search/hep-ex?searchtype=author&query=Palladino%2C+A">A. Palladino</a>, <a href="/search/hep-ex?searchtype=author&query=Quirk%2C+J">J. Quirk</a>, <a href="/search/hep-ex?searchtype=author&query=Roberts%2C+B+L">B. L. Roberts</a>, <a href="/search/hep-ex?searchtype=author&query=Crnkovic%2C+J">J. Crnkovic</a>, <a href="/search/hep-ex?searchtype=author&query=Polychronakos%2C+V">V. Polychronakos</a>, <a href="/search/hep-ex?searchtype=author&query=Tishchenko%2C+V">V. Tishchenko</a>, <a href="/search/hep-ex?searchtype=author&query=Yamin%2C+P">P. Yamin</a>, <a href="/search/hep-ex?searchtype=author&query=Cheng%2C+C+-">C. -h. Cheng</a>, <a href="/search/hep-ex?searchtype=author&query=Echenard%2C+B">B. Echenard</a>, <a href="/search/hep-ex?searchtype=author&query=Flood%2C+K">K. Flood</a>, <a href="/search/hep-ex?searchtype=author&query=Hitlin%2C+D+G">D. G. Hitlin</a>, <a href="/search/hep-ex?searchtype=author&query=Kim%2C+J+H">J. H. Kim</a>, <a href="/search/hep-ex?searchtype=author&query=Miyashita%2C+T+S">T. S. Miyashita</a>, <a href="/search/hep-ex?searchtype=author&query=Porter%2C+F+C">F. C. Porter</a>, <a href="/search/hep-ex?searchtype=author&query=R%C3%B6hrken%2C+M">M. R枚hrken</a>, <a href="/search/hep-ex?searchtype=author&query=Trevor%2C+J">J. Trevor</a>, <a href="/search/hep-ex?searchtype=author&query=Zhu%2C+R+-">R. -Y. Zhu</a>, <a href="/search/hep-ex?searchtype=author&query=Heckmaier%2C+E">E. Heckmaier</a>, <a href="/search/hep-ex?searchtype=author&query=Kang%2C+T+I">T. I. Kang</a>, <a href="/search/hep-ex?searchtype=author&query=Lim%2C+G">G. Lim</a>, <a href="/search/hep-ex?searchtype=author&query=Molzon%2C+W">W. Molzon</a> , et al. (238 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="1501.05241v2-abstract-short" style="display: inline;"> The Mu2e experiment at Fermilab will search for charged lepton flavor violation via the coherent conversion process mu- N --> e- N with a sensitivity approximately four orders of magnitude better than the current world's best limits for this process. The experiment's sensitivity offers discovery potential over a wide array of new physics models and probes mass scales well beyond the reach of the L… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.05241v2-abstract-full').style.display = 'inline'; document.getElementById('1501.05241v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1501.05241v2-abstract-full" style="display: none;"> The Mu2e experiment at Fermilab will search for charged lepton flavor violation via the coherent conversion process mu- N --> e- N with a sensitivity approximately four orders of magnitude better than the current world's best limits for this process. The experiment's sensitivity offers discovery potential over a wide array of new physics models and probes mass scales well beyond the reach of the LHC. We describe herein the preliminary design of the proposed Mu2e experiment. This document was created in partial fulfillment of the requirements necessary to obtain DOE CD-2 approval. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.05241v2-abstract-full').style.display = 'none'; document.getElementById('1501.05241v2-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 March, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 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">compressed file, 888 pages, 621 figures, 126 tables; full resolution available at http://mu2e.fnal.gov; corrected typo in background summary, Table 3.4</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> Fermilab-TM-2594 , Fermilab-DESIGN-2014-1 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1209.0482">arXiv:1209.0482</a> <span> [<a href="https://arxiv.org/pdf/1209.0482">pdf</a>, <a href="https://arxiv.org/format/1209.0482">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Space-Charge Effects in an Ungated GEM-based TPC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=B%C3%B6hmer%2C+F+V">F. V. B枚hmer</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=D%C3%B8rheim%2C+S">S. D酶rheim</a>, <a href="/search/hep-ex?searchtype=author&query=H%C3%B6ppner%2C+C">C. H枚ppner</a>, <a href="/search/hep-ex?searchtype=author&query=Ketzer%2C+B">B. Ketzer</a>, <a href="/search/hep-ex?searchtype=author&query=Konorov%2C+I">I. Konorov</a>, <a href="/search/hep-ex?searchtype=author&query=Neubert%2C+S">S. Neubert</a>, <a href="/search/hep-ex?searchtype=author&query=Paul%2C+S">S. Paul</a>, <a href="/search/hep-ex?searchtype=author&query=Rauch%2C+J">J. Rauch</a>, <a href="/search/hep-ex?searchtype=author&query=Vandenbroucke%2C+M">M. Vandenbroucke</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="1209.0482v1-abstract-short" style="display: inline;"> A fundamental limit to the application of Time Projection Chambers (TPCs) in high-rate experiments is the accumulation of slowly drifting ions in the active gas volume, which compromises the homogeneity of the drift field and hence the detector resolution. Conventionally, this problem is overcome by the use of ion-gating structures. This method, however, introduces large dead times and restricts t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1209.0482v1-abstract-full').style.display = 'inline'; document.getElementById('1209.0482v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1209.0482v1-abstract-full" style="display: none;"> A fundamental limit to the application of Time Projection Chambers (TPCs) in high-rate experiments is the accumulation of slowly drifting ions in the active gas volume, which compromises the homogeneity of the drift field and hence the detector resolution. Conventionally, this problem is overcome by the use of ion-gating structures. This method, however, introduces large dead times and restricts trigger rates to a few hundred per second. The ion gate can be eliminated from the setup by the use of Gas Electron Multiplier (GEM) foils for gas amplification, which intrinsically suppress the backflow of ions. This makes the continuous operation of a TPC at high rates feasible. In this work, Monte Carlo simulations of the buildup of ion space charge in a GEM-based TPC and the correction of the resulting drift distortions are discussed, based on realistic numbers for the ion backflow in a triple-GEM amplification stack. A TPC in the future PANDA experiment at FAIR, in which antiproton-proton interaction rates up to 2 x 10^7 per second will be reached, serves as an example for the experimental environment. The simulations show that space charge densities up to 65 fC per cubic cm are reached, leading to electron drift distortions of up to 10 mm. The application of a laser calibration system to correct these distortions is investigated. Based on full simulations of the detector physics and response, we show that it is possible to correct for the drift distortions and to maintain the good momentum resolution of the GEM-TPC. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1209.0482v1-abstract-full').style.display = 'none'; document.getElementById('1209.0482v1-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 September, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Preprint submitted to Nuclear Instruments and Methods 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/1207.0013">arXiv:1207.0013</a> <span> [<a href="https://arxiv.org/pdf/1207.0013">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Technical Design Study for the PANDA Time Projection Chamber </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=B%C3%B6hmer%2C+F+V">F. V. B枚hmer</a>, <a href="/search/hep-ex?searchtype=author&query=D%C3%B8rheim%2C+S">S. D酶rheim</a>, <a href="/search/hep-ex?searchtype=author&query=H%C3%B6ppner%2C+C">C. H枚ppner</a>, <a href="/search/hep-ex?searchtype=author&query=Ketzer%2C+B">B. Ketzer</a>, <a href="/search/hep-ex?searchtype=author&query=Konorov%2C+I">I. Konorov</a>, <a href="/search/hep-ex?searchtype=author&query=Neubert%2C+S">S. Neubert</a>, <a href="/search/hep-ex?searchtype=author&query=Paul%2C+S">S. Paul</a>, <a href="/search/hep-ex?searchtype=author&query=Rauch%2C+J">J. Rauch</a>, <a href="/search/hep-ex?searchtype=author&query=Uhl%2C+S">S. Uhl</a>, <a href="/search/hep-ex?searchtype=author&query=Vandenbroucke%2C+M">M. Vandenbroucke</a>, <a href="/search/hep-ex?searchtype=author&query=Berger%2C+M">M. Berger</a>, <a href="/search/hep-ex?searchtype=author&query=Berger-Chen%2C+J+-">J. -C. Berger-Chen</a>, <a href="/search/hep-ex?searchtype=author&query=Cusanno%2C+F">F. Cusanno</a>, <a href="/search/hep-ex?searchtype=author&query=Fabbietti%2C+L">L. Fabbietti</a>, <a href="/search/hep-ex?searchtype=author&query=M%C3%BCnzer%2C+R">R. M眉nzer</a>, <a href="/search/hep-ex?searchtype=author&query=Arora%2C+R">R. Arora</a>, <a href="/search/hep-ex?searchtype=author&query=Fr%C3%BChauf%2C+J">J. Fr眉hauf</a>, <a href="/search/hep-ex?searchtype=author&query=Ki%C5%A1%2C+M">M. Ki拧</a>, <a href="/search/hep-ex?searchtype=author&query=Leifels%2C+Y">Y. Leifels</a>, <a href="/search/hep-ex?searchtype=author&query=Kleipa%2C+V">V. Kleipa</a>, <a href="/search/hep-ex?searchtype=author&query=Hehner%2C+J">J. Hehner</a>, <a href="/search/hep-ex?searchtype=author&query=Kunkel%2C+J">J. Kunkel</a>, <a href="/search/hep-ex?searchtype=author&query=Kurz%2C+N">N. Kurz</a>, <a href="/search/hep-ex?searchtype=author&query=Peters%2C+K">K. Peters</a> , et al. (16 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="1207.0013v1-abstract-short" style="display: inline;"> This document illustrates the technical layout and the expected performance of a Time Projection Chamber as the central tracking system of the PANDA experiment. The detector is based on a continuously operating TPC with Gas Electron Multiplier (GEM) amplification. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1207.0013v1-abstract-full" style="display: none;"> This document illustrates the technical layout and the expected performance of a Time Projection Chamber as the central tracking system of the PANDA experiment. The detector is based on a continuously operating TPC with Gas Electron Multiplier (GEM) amplification. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1207.0013v1-abstract-full').style.display = 'none'; document.getElementById('1207.0013v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 June, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Editors: B. Ketzer, L. Fabbietti (TU M眉nchen) 84 pages, 122 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/1206.6199">arXiv:1206.6199</a> <span> [<a href="https://arxiv.org/pdf/1206.6199">pdf</a>, <a href="https://arxiv.org/format/1206.6199">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Design and characterization of the SiPM tracking system of NEXT-DEMO, a demonstrator prototype of the NEXT-100 experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=NEXT+Collaboration"> NEXT Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%C3%81lvarez%2C+V">V. 脕lvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G+M">F. I. G. M. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=C%C3%A1rcel%2C+S">S. C谩rcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carmona%2C+J+M">J. M. Carmona</a>, <a href="/search/hep-ex?searchtype=author&query=Castel%2C+J">J. Castel</a>, <a href="/search/hep-ex?searchtype=author&query=Catal%C3%A1%2C+J+M">J. M. Catal谩</a>, <a href="/search/hep-ex?searchtype=author&query=Cebri%C3%A1n%2C+S">S. Cebri谩n</a>, <a href="/search/hep-ex?searchtype=author&query=Cervera%2C+A">A. Cervera</a>, <a href="/search/hep-ex?searchtype=author&query=Chan%2C+D">D. Chan</a>, <a href="/search/hep-ex?searchtype=author&query=Conde%2C+C+A+N">C. A. N. Conde</a>, <a href="/search/hep-ex?searchtype=author&query=Dafni%2C+T">T. Dafni</a>, <a href="/search/hep-ex?searchtype=author&query=Dias%2C+T+H+V+T">T. H. V. T. Dias</a>, <a href="/search/hep-ex?searchtype=author&query=D%C3%ADaz%2C+J">J. D铆az</a>, <a href="/search/hep-ex?searchtype=author&query=Egorov%2C+M">M. Egorov</a>, <a href="/search/hep-ex?searchtype=author&query=Esteve%2C+R">R. Esteve</a>, <a href="/search/hep-ex?searchtype=author&query=Evtoukhovitch%2C+P">P. Evtoukhovitch</a>, <a href="/search/hep-ex?searchtype=author&query=Fernandes%2C+L+M+P">L. M. P. Fernandes</a>, <a href="/search/hep-ex?searchtype=author&query=Ferrario%2C+P">P. Ferrario</a>, <a href="/search/hep-ex?searchtype=author&query=Ferreira%2C+A+L">A. L. Ferreira</a>, <a href="/search/hep-ex?searchtype=author&query=Ferrer-Ribas%2C+E">E. Ferrer-Ribas</a>, <a href="/search/hep-ex?searchtype=author&query=Freitas%2C+E+D+C">E. D. C. Freitas</a>, <a href="/search/hep-ex?searchtype=author&query=Garcia%2C+A+N+C">A. N. C. Garcia</a>, <a href="/search/hep-ex?searchtype=author&query=Gehman%2C+V+M">V. M. Gehman</a> , et al. (64 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1206.6199v2-abstract-short" style="display: inline;"> NEXT-100 experiment aims at searching the neutrinoless double-beta decay of the Xe-136 isotope using a TPC filled with a 100 kg of high-pressure gaseous xenon, with 90% isotopic enrichment. The experiment will take place at the Laboratorio Subterr谩neo de Canfranc (LSC), Spain. NEXT-100 uses electroluminescence (EL) technology for energy measurement with a resolution better than 1% FWHM. The gaseou… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1206.6199v2-abstract-full').style.display = 'inline'; document.getElementById('1206.6199v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1206.6199v2-abstract-full" style="display: none;"> NEXT-100 experiment aims at searching the neutrinoless double-beta decay of the Xe-136 isotope using a TPC filled with a 100 kg of high-pressure gaseous xenon, with 90% isotopic enrichment. The experiment will take place at the Laboratorio Subterr谩neo de Canfranc (LSC), Spain. NEXT-100 uses electroluminescence (EL) technology for energy measurement with a resolution better than 1% FWHM. The gaseous xenon in the TPC additionally allows the tracks of the two beta particles to be recorded, which are expected to have a length of up to 30 cm at 10 bar pressure. The ability to record the topological signature of the neutrinoless double-beta events provides a powerful background rejection factor for the double-beta experiment. In this paper, we present a novel 3D imaging concept using SiPMs coated with tetraphenyl butadiene (TPB) for the EL read out and its first implementation in NEXT-DEMO, a large-scale prototype of the NEXT-100 experiment. The design and the first characterization measurements of the NEXT-DEMO SiPM tracking system are presented. The SiPM response uniformity over the tracking plane drawn from its gain map is shown to be better than 4%. An automated active control system for the stabilization of the SiPMs gain was developed, based on the voltage supply compensation of the gain drifts. The gain is shown to be stabilized within 0.2% relative variation around its nominal value, provided by Hamamatsu, in a temperature range of 10 degree C. The noise level from the electronics and the SiPM dark noise is shown to lay typically below the level of 10 photoelectrons (pe) in the ADC. Hence, a detection threshold at 10 pe is set for the acquisition of the tracking signals. The ADC full dynamic range (4096 channels) is shown to be adequate for signal levels of up to 200 pe/microsecond, which enables recording most of the tracking signals. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1206.6199v2-abstract-full').style.display = 'none'; document.getElementById('1206.6199v2-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 February, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 June, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Submitted to JINST</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1201.2018">arXiv:1201.2018</a> <span> [<a href="https://arxiv.org/pdf/1201.2018">pdf</a>, <a href="https://arxiv.org/format/1201.2018">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/7/02/P02010">10.1088/1748-0221/7/02/P02010 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> SiPMs coated with TPB : coating protocol and characterization for NEXT </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=%C3%81lvarez%2C+V">V. 脕lvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Agramunt%2C+J">J. Agramunt</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Batall%C3%A9%2C+M">M. Batall茅</a>, <a href="/search/hep-ex?searchtype=author&query=Bayarri%2C+J">J. Bayarri</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G">F. I. G. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=Bolink%2C+H">H. Bolink</a>, <a href="/search/hep-ex?searchtype=author&query=Brine%2C+H">H. Brine</a>, <a href="/search/hep-ex?searchtype=author&query=C%C3%A1rcel%2C+S">S. C谩rcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carmona%2C+J+M">J. M. Carmona</a>, <a href="/search/hep-ex?searchtype=author&query=Castel%2C+J">J. Castel</a>, <a href="/search/hep-ex?searchtype=author&query=Catal%C3%A1%2C+J+M">J. M. Catal谩</a>, <a href="/search/hep-ex?searchtype=author&query=Cebri%C3%A1n%2C+S">S. Cebri谩n</a>, <a href="/search/hep-ex?searchtype=author&query=Cervera%2C+A">A. Cervera</a>, <a href="/search/hep-ex?searchtype=author&query=Chan%2C+D">D. Chan</a>, <a href="/search/hep-ex?searchtype=author&query=Conde%2C+C+A+N">C. A. N. Conde</a>, <a href="/search/hep-ex?searchtype=author&query=Dafni%2C+T">T. Dafni</a>, <a href="/search/hep-ex?searchtype=author&query=Dias%2C+T+H+V+T">T. H. V. T. Dias</a>, <a href="/search/hep-ex?searchtype=author&query=D%C3%ADaz%2C+J">J. D铆az</a>, <a href="/search/hep-ex?searchtype=author&query=Esteve%2C+R">R. Esteve</a>, <a href="/search/hep-ex?searchtype=author&query=Evtoukhovitch%2C+P">P. Evtoukhovitch</a>, <a href="/search/hep-ex?searchtype=author&query=Ferrando%2C+J">J. Ferrando</a>, <a href="/search/hep-ex?searchtype=author&query=Fernandes%2C+L+M+P">L. M. P. Fernandes</a>, <a href="/search/hep-ex?searchtype=author&query=Ferrario%2C+P">P. Ferrario</a>, <a href="/search/hep-ex?searchtype=author&query=Ferreira%2C+A+L">A. L. Ferreira</a> , et al. (69 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1201.2018v1-abstract-short" style="display: inline;"> Silicon photomultipliers (SiPM) are the photon detectors chosen for the tracking readout in NEXT, a neutrinoless 尾尾 decay experiment which uses a high pressure gaseous xenon time projection chamber (TPC). The reconstruction of event track and topology in this gaseous detector is a key handle for background rejection. Among the commercially available sensors that can be used for tracking, SiPMs off… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1201.2018v1-abstract-full').style.display = 'inline'; document.getElementById('1201.2018v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1201.2018v1-abstract-full" style="display: none;"> Silicon photomultipliers (SiPM) are the photon detectors chosen for the tracking readout in NEXT, a neutrinoless 尾尾 decay experiment which uses a high pressure gaseous xenon time projection chamber (TPC). The reconstruction of event track and topology in this gaseous detector is a key handle for background rejection. Among the commercially available sensors that can be used for tracking, SiPMs offer important advantages, mainly high gain, ruggedness, cost-effectiveness and radio-purity. Their main drawback, however, is their non sensitivity in the emission spectrum of the xenon scintillation (peak at 175 nm). This is overcome by coating these sensors with the organic wavelength shifter tetraphenyl butadienne (TPB). In this paper we describe the protocol developed for coating the SiPMs with TPB and the measurements performed for characterizing the coatings as well as the performance of the coated sensors in the UV-VUV range. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1201.2018v1-abstract-full').style.display = 'none'; document.getElementById('1201.2018v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 January, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Submitted to the Journal of Instrumentation on december 26th 2011</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> JINST 7 (2012) P02010 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1106.3630">arXiv:1106.3630</a> <span> [<a href="https://arxiv.org/pdf/1106.3630">pdf</a>, <a href="https://arxiv.org/format/1106.3630">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> The NEXT-100 experiment for neutrinoless double beta decay searches (Conceptual Design Report) </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=NEXT+Collaboration"> NEXT Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%C3%81lvarez%2C+V">V. 脕lvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Batall%C3%A9%2C+M">M. Batall茅</a>, <a href="/search/hep-ex?searchtype=author&query=Bayarri%2C+J">J. Bayarri</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G">F. I. G. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=C%C3%A1rcel%2C+S">S. C谩rcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carmona%2C+J+M">J. M. Carmona</a>, <a href="/search/hep-ex?searchtype=author&query=Castel%2C+J">J. Castel</a>, <a href="/search/hep-ex?searchtype=author&query=Catal%C3%A1%2C+J+M">J. M. Catal谩</a>, <a href="/search/hep-ex?searchtype=author&query=Cebri%C3%A1n%2C+S">S. Cebri谩n</a>, <a href="/search/hep-ex?searchtype=author&query=Cervera-Villanueva%2C+A">A. Cervera-Villanueva</a>, <a href="/search/hep-ex?searchtype=author&query=Chan%2C+D">D. Chan</a>, <a href="/search/hep-ex?searchtype=author&query=Conde%2C+C+A+N">C. A. N. Conde</a>, <a href="/search/hep-ex?searchtype=author&query=Dafni%2C+T">T. Dafni</a>, <a href="/search/hep-ex?searchtype=author&query=Dias%2C+T+H+V+T">T. H. V. T. Dias</a>, <a href="/search/hep-ex?searchtype=author&query=D%C3%ADaz%2C+J">J. D铆az</a>, <a href="/search/hep-ex?searchtype=author&query=Esteve%2C+R">R. Esteve</a>, <a href="/search/hep-ex?searchtype=author&query=Evtoukhovitch%2C+P">P. Evtoukhovitch</a>, <a href="/search/hep-ex?searchtype=author&query=Fernandes%2C+L+M+P">L. M. P. Fernandes</a>, <a href="/search/hep-ex?searchtype=author&query=Ferrario%2C+P">P. Ferrario</a>, <a href="/search/hep-ex?searchtype=author&query=Ferrer-Ribas%2C+E">E. Ferrer-Ribas</a>, <a href="/search/hep-ex?searchtype=author&query=Ferreira%2C+A+L">A. L. Ferreira</a>, <a href="/search/hep-ex?searchtype=author&query=Freitas%2C+E+D+C">E. D. C. Freitas</a>, <a href="/search/hep-ex?searchtype=author&query=Gil%2C+A">A. Gil</a> , et al. (58 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1106.3630v1-abstract-short" style="display: inline;"> We propose an EASY (Electroluminescent ApparatuS of high Yield) and SOFT (Separated Optimized FuncTion) time-projection chamber for the NEXT experiment, that will search for neutrinoless double beta decay (bb0nu) in Xe-136. Our experiment must be competitive with the new generation of bb0nu searches already in operation or in construction. This requires a detector with very good energy resolution… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1106.3630v1-abstract-full').style.display = 'inline'; document.getElementById('1106.3630v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1106.3630v1-abstract-full" style="display: none;"> We propose an EASY (Electroluminescent ApparatuS of high Yield) and SOFT (Separated Optimized FuncTion) time-projection chamber for the NEXT experiment, that will search for neutrinoless double beta decay (bb0nu) in Xe-136. Our experiment must be competitive with the new generation of bb0nu searches already in operation or in construction. This requires a detector with very good energy resolution (<1%), very low background con- tamination (1E-4 counts/(keV \bullet kg \bullet y)) and large target mass. In addition, it needs to be operational as soon as possible. The design described here optimizes energy resolution thanks to the use of proportional electroluminescent amplification (EL); it is compact, as the Xe gas is under high pressure; and it allows the measurement of the topological signature of the event to further reduce the background contamination. The SOFT design uses different sensors for tracking and calorimetry. We propose the use of SiPMs (MPPCs) coated with a suitable wavelength shifter for the tracking, and the use of radiopure photomultipliers for the measurement of the energy and the primary scintillation needed to estimate the t0. This design provides the best possible energy resolution compared with other NEXT designs based on avalanche gain devices. The baseline design is an Asymmetric Neutrino Gas EL apparatus (ANGEL), which was already outlined in the NEXT LOI. ANGEL is conceived to be easy to fabricate. It requires very little R&D and most of the proposed solutions have already been tested in the NEXT-1 prototypes. Therefore, the detector can be ready by 2013. In this Conceptual Design Report (CDR) we discuss first the physics case, present a full design of the detector, describe the NEXT-1 EL prototypes and their initial results, and outline a project to build a detector with 100 kg of enriched xenon to be installed in the Canfranc Underground Laboratory in 2013. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1106.3630v1-abstract-full').style.display = 'none'; document.getElementById('1106.3630v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 June, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2011. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0907.4054">arXiv:0907.4054</a> <span> [<a href="https://arxiv.org/pdf/0907.4054">pdf</a>, <a href="https://arxiv.org/format/0907.4054">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> NEXT, a HPGXe TPC for neutrinoless double beta decay searches </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=The+NEXT+Collaboration"> The NEXT Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Granena%2C+F">F. Granena</a>, <a href="/search/hep-ex?searchtype=author&query=Lux%2C+T">T. Lux</a>, <a href="/search/hep-ex?searchtype=author&query=Nova%2C+F">F. Nova</a>, <a href="/search/hep-ex?searchtype=author&query=Rico%2C+J">J. Rico</a>, <a href="/search/hep-ex?searchtype=author&query=Sanchez%2C+F">F. Sanchez</a>, <a href="/search/hep-ex?searchtype=author&query=Nygren%2C+D+R">D. R. Nygren</a>, <a href="/search/hep-ex?searchtype=author&query=Barata%2C+J+A+S">J. A. S. Barata</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G+M">F. I. G. M. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=Conde%2C+C+A+N">C. A. N. Conde</a>, <a href="/search/hep-ex?searchtype=author&query=Dias%2C+T+H+V+T">T. H. V. T. Dias</a>, <a href="/search/hep-ex?searchtype=author&query=Fernandes%2C+L+M+P">L. M. P. Fernandes</a>, <a href="/search/hep-ex?searchtype=author&query=Freitas%2C+E+D+C">E. D. C. Freitas</a>, <a href="/search/hep-ex?searchtype=author&query=Lopes%2C+J+A+M">J. A. M. Lopes</a>, <a href="/search/hep-ex?searchtype=author&query=Monteiro%2C+C+M+B">C. M. B. Monteiro</a>, <a href="/search/hep-ex?searchtype=author&query=Santos%2C+J+M+F+d">J. M. F. dos Santos</a>, <a href="/search/hep-ex?searchtype=author&query=Santos%2C+F+P">F. P. Santos</a>, <a href="/search/hep-ex?searchtype=author&query=Tavora%2C+L+M+N">L. M. N. Tavora</a>, <a href="/search/hep-ex?searchtype=author&query=Veloso%2C+J+F+C+A">J. F. C. A. Veloso</a>, <a href="/search/hep-ex?searchtype=author&query=Calvo%2C+E">E. Calvo</a>, <a href="/search/hep-ex?searchtype=author&query=Gil-Botella%2C+I">I. Gil-Botella</a>, <a href="/search/hep-ex?searchtype=author&query=Novella%2C+P">P. Novella</a>, <a href="/search/hep-ex?searchtype=author&query=Palomares%2C+C">C. Palomares</a>, <a href="/search/hep-ex?searchtype=author&query=Verdugo%2C+A">A. Verdugo</a>, <a href="/search/hep-ex?searchtype=author&query=Giomataris%2C+I">I. Giomataris</a> , et al. (39 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="0907.4054v1-abstract-short" style="display: inline;"> We propose a novel detection concept for neutrinoless double-beta decay searches. This concept is based on a Time Projection Chamber (TPC) filled with high-pressure gaseous xenon, and with separated-function capabilities for calorimetry and tracking. Thanks to its excellent energy resolution, together with its powerful background rejection provided by the distinct double-beta decay topological s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0907.4054v1-abstract-full').style.display = 'inline'; document.getElementById('0907.4054v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0907.4054v1-abstract-full" style="display: none;"> We propose a novel detection concept for neutrinoless double-beta decay searches. This concept is based on a Time Projection Chamber (TPC) filled with high-pressure gaseous xenon, and with separated-function capabilities for calorimetry and tracking. Thanks to its excellent energy resolution, together with its powerful background rejection provided by the distinct double-beta decay topological signature, the design discussed in this Letter Of Intent promises to be competitive and possibly out-perform existing proposals for next-generation neutrinoless double-beta decay experiments. We discuss the detection principles, design specifications, physics potential and R&D plans to construct a detector with 100 kg fiducial mass in the double-beta decay emitting isotope Xe(136), to be installed in the Canfranc Underground Laboratory. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0907.4054v1-abstract-full').style.display = 'none'; document.getElementById('0907.4054v1-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 July, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2009. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Letter of Intent to the LSC Scientific Committee 115 pages</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0905.2655">arXiv:0905.2655</a> <span> [<a href="https://arxiv.org/pdf/0905.2655">pdf</a>, <a href="https://arxiv.org/ps/0905.2655">ps</a>, <a href="https://arxiv.org/format/0905.2655">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2010.02.175">10.1016/j.nima.2010.02.175 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Cosmic Ray Tests of the Prototype TPC for the ILC Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Ackermann%2C+K">K. Ackermann</a>, <a href="/search/hep-ex?searchtype=author&query=Arai%2C+S">S. Arai</a>, <a href="/search/hep-ex?searchtype=author&query=Arogancia%2C+D+C">D. C. Arogancia</a>, <a href="/search/hep-ex?searchtype=author&query=Bacala%2C+A+M">A. M. Bacala</a>, <a href="/search/hep-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/hep-ex?searchtype=author&query=Behnke%2C+T">T. Behnke</a>, <a href="/search/hep-ex?searchtype=author&query=Bito%2C+H">H. Bito</a>, <a href="/search/hep-ex?searchtype=author&query=Eckardt%2C+V">V. Eckardt</a>, <a href="/search/hep-ex?searchtype=author&query=Fujii%2C+K">K. Fujii</a>, <a href="/search/hep-ex?searchtype=author&query=Fusayasu%2C+T">T. Fusayasu</a>, <a href="/search/hep-ex?searchtype=author&query=Ghodbane%2C+N">N. Ghodbane</a>, <a href="/search/hep-ex?searchtype=author&query=Gooc%2C+H+C">H. C. Gooc Jr.</a>, <a href="/search/hep-ex?searchtype=author&query=Kijima%2C+T">T. Kijima</a>, <a href="/search/hep-ex?searchtype=author&query=Hamann%2C+M">M. Hamann</a>, <a href="/search/hep-ex?searchtype=author&query=Habu%2C+M">M. Habu</a>, <a href="/search/hep-ex?searchtype=author&query=Heuer%2C+R+-">R. -D. Heuer</a>, <a href="/search/hep-ex?searchtype=author&query=Hiramatsu%2C+K">K. Hiramatsu</a>, <a href="/search/hep-ex?searchtype=author&query=Ikematsu%2C+K">K. Ikematsu</a>, <a href="/search/hep-ex?searchtype=author&query=Kaukher%2C+A">A. Kaukher</a>, <a href="/search/hep-ex?searchtype=author&query=Kuroiwa%2C+H">H. Kuroiwa</a>, <a href="/search/hep-ex?searchtype=author&query=Janssen%2C+M+E">M. E. Janssen</a>, <a href="/search/hep-ex?searchtype=author&query=Kato%2C+Y">Y. Kato</a>, <a href="/search/hep-ex?searchtype=author&query=Kobayashi%2C+M">M. Kobayashi</a>, <a href="/search/hep-ex?searchtype=author&query=Kuhl%2C+T">T. Kuhl</a>, <a href="/search/hep-ex?searchtype=author&query=Lux%2C+T">T. Lux</a> , et al. (25 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="0905.2655v1-abstract-short" style="display: inline;"> A time projection chamber (TPC) is a strong candidate for the central tracker of the international linear collider (ILC) experiment and we have been conducting a series of cosmic ray experiments under a magnetic field up to 4 T, using a small prototype TPC with a replaceable readout device: multi-wire proportional chamber (MWPC) or gas electron multiplier (GEM). We first confirmed that the MWPC… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0905.2655v1-abstract-full').style.display = 'inline'; document.getElementById('0905.2655v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0905.2655v1-abstract-full" style="display: none;"> A time projection chamber (TPC) is a strong candidate for the central tracker of the international linear collider (ILC) experiment and we have been conducting a series of cosmic ray experiments under a magnetic field up to 4 T, using a small prototype TPC with a replaceable readout device: multi-wire proportional chamber (MWPC) or gas electron multiplier (GEM). We first confirmed that the MWPC readout could not be a fall-back option of the ILC-TPC under a strong axial magnetic field of 4 T since its spatial resolution suffered severely from the so called E x B effect in the vicinity of the wire planes. The GEM readout, on the other hand, was found to be virtually free from the E x B effect as had been expected and gave the resolution determined by the transverse diffusion of the drift electrons (diffusion limited). Furthermore, GEMs allow a wider choice of gas mixtures than MWPCs. Among the gases we tried so far a mixture of Ar-CF4-isobutane, in which MWPCs could be prone to discharges, seems promising as the operating gas of the ILC-TPC because of its small diffusion constant especially under a strong magnetic field. We report the measured drift properties of this mixture including the diffusion constant as a function of the electric field and compare them with the predictions of Magboltz. Also presented is the spatial resolution of a GEM-based ILC-TPC estimated from the measurement with the prototype. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0905.2655v1-abstract-full').style.display = 'none'; document.getElementById('0905.2655v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 May, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2009. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 8 figures. Preprint submitted to TIPP09 Proceedings</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Instrum.Meth.A623:141-143,2010 </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 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