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breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Bacchetta%2C+A&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Bacchetta%2C+A&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Bacchetta%2C+A&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> <li> <a href="/search/?searchtype=author&query=Bacchetta%2C+A&start=100" class="pagination-link " aria-label="Page 3" aria-current="page">3 </a> </li> </ul> </nav> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2502.04166">arXiv:2502.04166</a> <span> [<a href="https://arxiv.org/pdf/2502.04166">pdf</a>, <a href="https://arxiv.org/format/2502.04166">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> <p class="title is-5 mathjax"> A Neural-Network Extraction of Unpolarised Transverse-Momentum-Dependent Distributions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Bertone%2C+V">Valerio Bertone</a>, <a href="/search/?searchtype=author&query=Bissolotti%2C+C">Chiara Bissolotti</a>, <a href="/search/?searchtype=author&query=Cerutti%2C+M">Matteo Cerutti</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</a>, <a href="/search/?searchtype=author&query=Rodini%2C+S">Simone Rodini</a>, <a href="/search/?searchtype=author&query=Rossi%2C+L">Lorenzo Rossi</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="2502.04166v1-abstract-short" style="display: inline;"> We present the first extraction of transverse-momentum-dependent distributions of unpolarised quarks from experimental Drell-Yan data using neural networks to parametrise their nonperturbative part. We show that neural networks outperform traditional parametrisations providing a more accurate description of data. This work establishes the feasibility of using neural networks to explore the multi-d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2502.04166v1-abstract-full').style.display = 'inline'; document.getElementById('2502.04166v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2502.04166v1-abstract-full" style="display: none;"> We present the first extraction of transverse-momentum-dependent distributions of unpolarised quarks from experimental Drell-Yan data using neural networks to parametrise their nonperturbative part. We show that neural networks outperform traditional parametrisations providing a more accurate description of data. This work establishes the feasibility of using neural networks to explore the multi-dimensional partonic structure of hadrons and paves the way for more accurate determinations based on machine-learning techniques. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2502.04166v1-abstract-full').style.display = 'none'; document.getElementById('2502.04166v1-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 February, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2025. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> DESY-25-022, JLAB-THY-25-4221 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.18078">arXiv:2409.18078</a> <span> [<a href="https://arxiv.org/pdf/2409.18078">pdf</a>, <a href="https://arxiv.org/format/2409.18078">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> </div> </div> <p class="title is-5 mathjax"> Exploring the three-dimensional momentum distribution of longitudinally polarized quarks in the proton </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Bongallino%2C+A">Alessia Bongallino</a>, <a href="/search/?searchtype=author&query=Cerutti%2C+M">Matteo Cerutti</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</a>, <a href="/search/?searchtype=author&query=Rossi%2C+L">Lorenzo Rossi</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="2409.18078v1-abstract-short" style="display: inline;"> By analyzing experimental data on semi-inclusive deep inelastic scattering off longitudinally polarized targets, we extract the transverse momentum dependence of the quark helicity distribution, i.e., the difference between the three-dimensional motion of quarks with polarization parallel or antiparallel to the longitudinal polarization of the parent hadron. We perform the analysis at next-to-lead… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.18078v1-abstract-full').style.display = 'inline'; document.getElementById('2409.18078v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.18078v1-abstract-full" style="display: none;"> By analyzing experimental data on semi-inclusive deep inelastic scattering off longitudinally polarized targets, we extract the transverse momentum dependence of the quark helicity distribution, i.e., the difference between the three-dimensional motion of quarks with polarization parallel or antiparallel to the longitudinal polarization of the parent hadron. We perform the analysis at next-to-leading (NLL) and next-to-next-to-leading (NNLL) perturbative accuracy. The quality of the fit is very good for both cases, reaching a $蠂^2$ per number of data points equal to $1.11$ and $1.09$, respectively. Although the limited number of data points leads to significant uncertainties, the data are consistent with an interpretation in which the helicity distribution is narrower in transverse momentum than the unpolarized distribution. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.18078v1-abstract-full').style.display = 'none'; document.getElementById('2409.18078v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-THY-24-4204 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2406.04893">arXiv:2406.04893</a> <span> [<a href="https://arxiv.org/pdf/2406.04893">pdf</a>, <a href="https://arxiv.org/format/2406.04893">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> </div> <p class="title is-5 mathjax"> Proton 3D reconstruction with T-odd TMD gluon densities </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Celiberto%2C+F+G">Francesco Giovanni Celiberto</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</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="2406.04893v1-abstract-short" style="display: inline;"> We present studies aimed at probing the 3D gluon content of the proton through spin-dependent TMD gluon densities, computed by means of the spectator-model approach. Our formalism incorporates a fit-based modulation function for the spectator mass, designed to capture longitudinal-momentum effects across a broad kinematic range. Special emphasis is placed on the time-reversal even Boer-Mulders and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.04893v1-abstract-full').style.display = 'inline'; document.getElementById('2406.04893v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.04893v1-abstract-full" style="display: none;"> We present studies aimed at probing the 3D gluon content of the proton through spin-dependent TMD gluon densities, computed by means of the spectator-model approach. Our formalism incorporates a fit-based modulation function for the spectator mass, designed to capture longitudinal-momentum effects across a broad kinematic range. Special emphasis is placed on the time-reversal even Boer-Mulders and the time-reversal odd Sivers functions. Accurate understanding of these functions is crucial for conducting precise 3D analyses of nucleons, highlighting the importance of collaborative efforts between the LHC and EIC Communities. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.04893v1-abstract-full').style.display = 'none'; document.getElementById('2406.04893v1-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 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 1 figure, presented by F.G. Celiberto at the 25th International Spin Physics Symposium (SPIN 2023), 24-29 September 2023, Durham, NC, USA</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2405.13833">arXiv:2405.13833</a> <span> [<a href="https://arxiv.org/pdf/2405.13833">pdf</a>, <a href="https://arxiv.org/format/2405.13833">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/JHEP08(2024)232">10.1007/JHEP08(2024)232 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Flavor dependence of unpolarized quark Transverse Momentum Distributions from a global fit </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Bertone%2C+V">Valerio Bertone</a>, <a href="/search/?searchtype=author&query=Bissolotti%2C+C">Chiara Bissolotti</a>, <a href="/search/?searchtype=author&query=Bozzi%2C+G">Giuseppe Bozzi</a>, <a href="/search/?searchtype=author&query=Cerutti%2C+M">Matteo Cerutti</a>, <a href="/search/?searchtype=author&query=Delcarro%2C+F">Filippo Delcarro</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</a>, <a href="/search/?searchtype=author&query=Rossi%2C+L">Lorenzo Rossi</a>, <a href="/search/?searchtype=author&query=Signori%2C+A">Andrea Signori</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="2405.13833v2-abstract-short" style="display: inline;"> We present an extraction of the unpolarized transverse-momentum-dependent parton distribution and fragmentation functions that takes into account possible differences between quark flavors and final-state hadrons. The extraction is based on experimental measurements from Drell-Yan processes and semi-inclusive deep-inelastic scattering, whose combination is essential to distinguish flavor differenc… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.13833v2-abstract-full').style.display = 'inline'; document.getElementById('2405.13833v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2405.13833v2-abstract-full" style="display: none;"> We present an extraction of the unpolarized transverse-momentum-dependent parton distribution and fragmentation functions that takes into account possible differences between quark flavors and final-state hadrons. The extraction is based on experimental measurements from Drell-Yan processes and semi-inclusive deep-inelastic scattering, whose combination is essential to distinguish flavor differences. The analysis is carried out at N$^3$LL accuracy. The extracted flavor-dependent distributions give a very good description of the data ($蠂^2/N_{\rm dat} = 1.08$). The resulting uncertainties take fully into account also the uncertainties in the determination of the corresponding collinear distributions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.13833v2-abstract-full').style.display = 'none'; document.getElementById('2405.13833v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Updated version as published in JHEP</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-THY-24-4066 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> JHEP 08 (2024), 232 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2402.17556">arXiv:2402.17556</a> <span> [<a href="https://arxiv.org/pdf/2402.17556">pdf</a>, <a href="https://arxiv.org/format/2402.17556">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> </div> <p class="title is-5 mathjax"> T-odd gluon distribution functions in a spectator model </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Celiberto%2C+F+G">Francesco Giovanni Celiberto</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2402.17556v1-abstract-short" style="display: inline;"> We present a model calculation of T-odd transverse-momentum-dependent distributions of gluons in the nucleon. The model is based on the assumption that a nucleon can emit a gluon, and what remains after the emission is treated as a single spectator particle. This spectator particle is considered to be on-shell, but its mass is allowed to take a continuous range of values, described by a spectral f… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.17556v1-abstract-full').style.display = 'inline'; document.getElementById('2402.17556v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.17556v1-abstract-full" style="display: none;"> We present a model calculation of T-odd transverse-momentum-dependent distributions of gluons in the nucleon. The model is based on the assumption that a nucleon can emit a gluon, and what remains after the emission is treated as a single spectator particle. This spectator particle is considered to be on-shell, but its mass is allowed to take a continuous range of values, described by a spectral function. The final-state interaction that is necessary to generate T-odd functions is modeled as the exchange of a single gluon between the spectator and the outgoing parton. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.17556v1-abstract-full').style.display = 'none'; document.getElementById('2402.17556v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">32 pages, 7 (multiple) figures, 2 appendices with details of calculations</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2310.19916">arXiv:2310.19916</a> <span> [<a href="https://arxiv.org/pdf/2310.19916">pdf</a>, <a href="https://arxiv.org/format/2310.19916">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> </div> </div> <p class="title is-5 mathjax"> Spectator-model studies for spin-dependent gluon TMD PDFs at the LHC and EIC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Celiberto%2C+F+G">Francesco Giovanni Celiberto</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</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="2310.19916v1-abstract-short" style="display: inline;"> We present novel analyses on accessing the 3D gluon content of the proton via spin-dependent TMD gluon densities, calculated through the spectator-model approach. Our formalism embodies a fit-based spectator-mass modulation function, suited to catch longitudinal-momentum effects in a wide kinematic range. Particular attention is paid to the time-reversal even Boer--Mulders and the time-reversal od… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.19916v1-abstract-full').style.display = 'inline'; document.getElementById('2310.19916v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2310.19916v1-abstract-full" style="display: none;"> We present novel analyses on accessing the 3D gluon content of the proton via spin-dependent TMD gluon densities, calculated through the spectator-model approach. Our formalism embodies a fit-based spectator-mass modulation function, suited to catch longitudinal-momentum effects in a wide kinematic range. Particular attention is paid to the time-reversal even Boer--Mulders and the time-reversal odd Sivers functions, whose accurate knowledge, needed to perform precise 3D analyses of nucleons, motivates synergies between LHC and EIC Communities. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.19916v1-abstract-full').style.display = 'none'; document.getElementById('2310.19916v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 1 figure, presented by F.G. Celiberto at the European Physical Society Conference on High Energy Physics (EPS-HEP) 2023, 20-25 August 2023, Universit盲t Hamburg</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2306.09360">arXiv:2306.09360</a> <span> [<a href="https://arxiv.org/pdf/2306.09360">pdf</a>, <a href="https://arxiv.org/format/2306.09360">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> </div> <p class="title is-5 mathjax"> Strong Interaction Physics at the Luminosity Frontier with 22 GeV Electrons at Jefferson Lab </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Accardi%2C+A">A. Accardi</a>, <a href="/search/?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/?searchtype=author&query=Adhikari%2C+D">D. Adhikari</a>, <a href="/search/?searchtype=author&query=Afanasev%2C+A">A. Afanasev</a>, <a href="/search/?searchtype=author&query=Akondi%2C+C+S">C. S. Akondi</a>, <a href="/search/?searchtype=author&query=Akopov%2C+N">N. Akopov</a>, <a href="/search/?searchtype=author&query=Albaladejo%2C+M">M. Albaladejo</a>, <a href="/search/?searchtype=author&query=Albataineh%2C+H">H. Albataineh</a>, <a href="/search/?searchtype=author&query=Albrecht%2C+M">M. Albrecht</a>, <a href="/search/?searchtype=author&query=Almeida-Zamora%2C+B">B. Almeida-Zamora</a>, <a href="/search/?searchtype=author&query=Amaryan%2C+M">M. Amaryan</a>, <a href="/search/?searchtype=author&query=Androi%C4%87%2C+D">D. Androi膰</a>, <a href="/search/?searchtype=author&query=Armstrong%2C+W">W. Armstrong</a>, <a href="/search/?searchtype=author&query=Armstrong%2C+D+S">D. S. Armstrong</a>, <a href="/search/?searchtype=author&query=Arratia%2C+M">M. Arratia</a>, <a href="/search/?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/?searchtype=author&query=Asaturyan%2C+A">A. Asaturyan</a>, <a href="/search/?searchtype=author&query=Austregesilo%2C+A">A. Austregesilo</a>, <a href="/search/?searchtype=author&query=Avagyan%2C+H">H. Avagyan</a>, <a href="/search/?searchtype=author&query=Averett%2C+T">T. Averett</a>, <a href="/search/?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/?searchtype=author&query=Bacchetta%2C+A">A. Bacchetta</a>, <a href="/search/?searchtype=author&query=Balantekin%2C+A+B">A. B. Balantekin</a>, <a href="/search/?searchtype=author&query=Baltzell%2C+N">N. Baltzell</a>, <a href="/search/?searchtype=author&query=Barion%2C+L">L. Barion</a> , et al. (419 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2306.09360v2-abstract-short" style="display: inline;"> This document presents the initial scientific case for upgrading the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab (JLab) to 22 GeV. It is the result of a community effort, incorporating insights from a series of workshops conducted between March 2022 and April 2023. With a track record of over 25 years in delivering the world's most intense and precise multi-GeV electron… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.09360v2-abstract-full').style.display = 'inline'; document.getElementById('2306.09360v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.09360v2-abstract-full" style="display: none;"> This document presents the initial scientific case for upgrading the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab (JLab) to 22 GeV. It is the result of a community effort, incorporating insights from a series of workshops conducted between March 2022 and April 2023. With a track record of over 25 years in delivering the world's most intense and precise multi-GeV electron beams, CEBAF's potential for a higher energy upgrade presents a unique opportunity for an innovative nuclear physics program, which seamlessly integrates a rich historical background with a promising future. The proposed physics program encompass a diverse range of investigations centered around the nonperturbative dynamics inherent in hadron structure and the exploration of strongly interacting systems. It builds upon the exceptional capabilities of CEBAF in high-luminosity operations, the availability of existing or planned Hall equipment, and recent advancements in accelerator technology. The proposed program cover various scientific topics, including Hadron Spectroscopy, Partonic Structure and Spin, Hadronization and Transverse Momentum, Spatial Structure, Mechanical Properties, Form Factors and Emergent Hadron Mass, Hadron-Quark Transition, and Nuclear Dynamics at Extreme Conditions, as well as QCD Confinement and Fundamental Symmetries. Each topic highlights the key measurements achievable at a 22 GeV CEBAF accelerator. Furthermore, this document outlines the significant physics outcomes and unique aspects of these programs that distinguish them from other existing or planned facilities. In summary, this document provides an exciting rationale for the energy upgrade of CEBAF to 22 GeV, outlining the transformative scientific potential that lies within reach, and the remarkable opportunities it offers for advancing our understanding of hadron physics and related fundamental phenomena. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.09360v2-abstract-full').style.display = 'none'; document.getElementById('2306.09360v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Updates to the list of authors; Preprint number changed from theory to experiment; Updates to sections 4 and 6, including additional figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-23-3840 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2306.04704">arXiv:2306.04704</a> <span> [<a href="https://arxiv.org/pdf/2306.04704">pdf</a>, <a href="https://arxiv.org/format/2306.04704">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> </div> <p class="title is-5 mathjax"> Signals of strong parity violation in deep inelastic scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Cerutti%2C+M">Matteo Cerutti</a>, <a href="/search/?searchtype=author&query=Manna%2C+L">Ludovico Manna</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</a>, <a href="/search/?searchtype=author&query=Zheng%2C+X">Xiaochao Zheng</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="2306.04704v2-abstract-short" style="display: inline;"> We include strong parity-violating contributions to inclusive deep inelastic scattering (DIS) of longitudinally polarized leptons off an unpolarized target. At variance with standard results, we obtain nonvanishing parity-violating structure functions in the case of pure photon exchange. The addition of these strong parity-violating contributions improves the description of existing experimental d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.04704v2-abstract-full').style.display = 'inline'; document.getElementById('2306.04704v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.04704v2-abstract-full" style="display: none;"> We include strong parity-violating contributions to inclusive deep inelastic scattering (DIS) of longitudinally polarized leptons off an unpolarized target. At variance with standard results, we obtain nonvanishing parity-violating structure functions in the case of pure photon exchange. The addition of these strong parity-violating contributions improves the description of existing experimental data on DIS parity-violating asymmetries. We find the size of these contributions small but exhibiting a deviation from zero of about 1.5 $蟽$. The associated $p$-value is 0.063, indicating that the probability of making an error by rejecting the hypothesis of no parity-violating contributions is 6.3\%, which is small but not negligible. Further improvement on the limit of the strong parity-violation can be expected from the future SoLID program at Jefferson Lab. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.04704v2-abstract-full').style.display = 'none'; document.getElementById('2306.04704v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 7 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Revised version, 10 pages, 3 figures, RevTeX style; accepted for publication in Phys. Lett. B</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2305.14572">arXiv:2305.14572</a> <span> [<a href="https://arxiv.org/pdf/2305.14572">pdf</a>, <a href="https://arxiv.org/ps/2305.14572">ps</a>, <a href="https://arxiv.org/format/2305.14572">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> <p class="title is-5 mathjax"> The case for an EIC Theory Alliance: Theoretical Challenges of the EIC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Abir%2C+R">Raktim Abir</a>, <a href="/search/?searchtype=author&query=Akushevich%2C+I">Igor Akushevich</a>, <a href="/search/?searchtype=author&query=Altinoluk%2C+T">Tolga Altinoluk</a>, <a href="/search/?searchtype=author&query=Anderle%2C+D+P">Daniele Paolo Anderle</a>, <a href="/search/?searchtype=author&query=Aslan%2C+F+P">Fatma P. Aslan</a>, <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Balantekin%2C+B">Baha Balantekin</a>, <a href="/search/?searchtype=author&query=Barata%2C+J">Joao Barata</a>, <a href="/search/?searchtype=author&query=Battaglieri%2C+M">Marco Battaglieri</a>, <a href="/search/?searchtype=author&query=Bertulani%2C+C+A">Carlos A. Bertulani</a>, <a href="/search/?searchtype=author&query=Beuf%2C+G">Guillaume Beuf</a>, <a href="/search/?searchtype=author&query=Bissolotti%2C+C">Chiara Bissolotti</a>, <a href="/search/?searchtype=author&query=Boer%2C+D">Dani毛l Boer</a>, <a href="/search/?searchtype=author&query=Boglione%2C+M">M. Boglione</a>, <a href="/search/?searchtype=author&query=Boughezal%2C+R">Radja Boughezal</a>, <a href="/search/?searchtype=author&query=Braaten%2C+E">Eric Braaten</a>, <a href="/search/?searchtype=author&query=Brambilla%2C+N">Nora Brambilla</a>, <a href="/search/?searchtype=author&query=Braun%2C+V">Vladimir Braun</a>, <a href="/search/?searchtype=author&query=Byer%2C+D">Duane Byer</a>, <a href="/search/?searchtype=author&query=Celiberto%2C+F+G">Francesco Giovanni Celiberto</a>, <a href="/search/?searchtype=author&query=Chien%2C+Y">Yang-Ting Chien</a>, <a href="/search/?searchtype=author&query=Clo%C3%ABt%2C+I+C">Ian C. Clo毛t</a>, <a href="/search/?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/?searchtype=author&query=Cosyn%2C+W">Wim Cosyn</a>, <a href="/search/?searchtype=author&query=Courtoy%2C+A">Aurore Courtoy</a> , et al. (146 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="2305.14572v1-abstract-short" style="display: inline;"> We outline the physics opportunities provided by the Electron Ion Collider (EIC). These include the study of the parton structure of the nucleon and nuclei, the onset of gluon saturation, the production of jets and heavy flavor, hadron spectroscopy and tests of fundamental symmetries. We review the present status and future challenges in EIC theory that have to be addressed in order to realize thi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.14572v1-abstract-full').style.display = 'inline'; document.getElementById('2305.14572v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.14572v1-abstract-full" style="display: none;"> We outline the physics opportunities provided by the Electron Ion Collider (EIC). These include the study of the parton structure of the nucleon and nuclei, the onset of gluon saturation, the production of jets and heavy flavor, hadron spectroscopy and tests of fundamental symmetries. We review the present status and future challenges in EIC theory that have to be addressed in order to realize this ambitious and impactful physics program, including how to engage a diverse and inclusive workforce. In order to address these many-fold challenges, we propose a coordinated effort involving theory groups with differing expertise is needed. We discuss the scientific goals and scope of such an EIC Theory Alliance. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.14572v1-abstract-full').style.display = 'none'; document.getElementById('2305.14572v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">44 pages, ReVTeX, White Paper on EIC Theory Alliance</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.04314">arXiv:2303.04314</a> <span> [<a href="https://arxiv.org/pdf/2303.04314">pdf</a>, <a href="https://arxiv.org/format/2303.04314">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.108.014005">10.1103/PhysRevD.108.014005 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Analogies between hadron-in-jet and dihadron fragmentation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</a>, <a href="/search/?searchtype=author&query=Rossi%2C+L">Lorenzo Rossi</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="2303.04314v1-abstract-short" style="display: inline;"> We describe the formal analogies in the description of the inclusive production in hard processes of hadron pairs (based on dihadron fragmentation functions) and of a single hadron inside a jet (based on hadron-in-jet fragmentation functions). Since several observables involving dihadron fragmentation functions have been proposed in the past, we are able to suggest new interesting observables invo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.04314v1-abstract-full').style.display = 'inline'; document.getElementById('2303.04314v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.04314v1-abstract-full" style="display: none;"> We describe the formal analogies in the description of the inclusive production in hard processes of hadron pairs (based on dihadron fragmentation functions) and of a single hadron inside a jet (based on hadron-in-jet fragmentation functions). Since several observables involving dihadron fragmentation functions have been proposed in the past, we are able to suggest new interesting observables involving hadron-in-jet fragmentation functions, in lepton-hadron deep-inelastic scattering and hadronic collisions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.04314v1-abstract-full').style.display = 'none'; document.getElementById('2303.04314v1-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 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">18 pages, 6 (composite) 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/2210.01733">arXiv:2210.01733</a> <span> [<a href="https://arxiv.org/pdf/2210.01733">pdf</a>, <a href="https://arxiv.org/format/2210.01733">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> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.107.014014">10.1103/PhysRevD.107.014014 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Extraction of Pion Transverse Momentum Distributions from Drell-Yan data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Cerutti%2C+M">Matteo Cerutti</a>, <a href="/search/?searchtype=author&query=Rossi%2C+L">Lorenzo Rossi</a>, <a href="/search/?searchtype=author&query=Venturini%2C+S">Simone Venturini</a>, <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Bertone%2C+V">Valerio Bertone</a>, <a href="/search/?searchtype=author&query=Bissolotti%2C+C">Chiara Bissolotti</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2210.01733v1-abstract-short" style="display: inline;"> We map the distribution of unpolarized quarks inside a unpolarized pion as a function of the quark's transverse momentum, encoded in unpolarized Transverse Momentum Distributions (TMDs). We extract the pion TMDs from available data of unpolarized pion-nucleus Drell-Yan processes, where the cross section is differential in the lepton-pair transverse momentum. In the cross section, pion TMDs are con… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.01733v1-abstract-full').style.display = 'inline'; document.getElementById('2210.01733v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.01733v1-abstract-full" style="display: none;"> We map the distribution of unpolarized quarks inside a unpolarized pion as a function of the quark's transverse momentum, encoded in unpolarized Transverse Momentum Distributions (TMDs). We extract the pion TMDs from available data of unpolarized pion-nucleus Drell-Yan processes, where the cross section is differential in the lepton-pair transverse momentum. In the cross section, pion TMDs are convoluted with nucleon TMDs that we consistently take from our previous studies. We obtain a fairly good agreement with data. We present also predictions for pion-nucleus scattering that is being measured by the COMPASS Collaboration. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.01733v1-abstract-full').style.display = 'none'; document.getElementById('2210.01733v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2208.06252">arXiv:2208.06252</a> <span> [<a href="https://arxiv.org/pdf/2208.06252">pdf</a>, <a href="https://arxiv.org/format/2208.06252">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> </div> </div> <p class="title is-5 mathjax"> Phenomenology of gluon TMDs from $畏_{b,c}$ production </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Celiberto%2C+F+G">Francesco Giovanni Celiberto</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</a>, <a href="/search/?searchtype=author&query=Signori%2C+A">Andrea Signori</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="2208.06252v2-abstract-short" style="display: inline;"> We present the potential of $畏_{b,c}$ production in proton collisions to access the gluon transverse-momentum dependent parton distributions (TMDs). In particular, we explore the phenomenology of the unpolarized and linearly-polarized gluon TMDs in unpolarized collisions for different kinematic settings, and the potential of a fixed-target experiment at the LHC. </span> <span class="abstract-full has-text-grey-dark mathjax" id="2208.06252v2-abstract-full" style="display: none;"> We present the potential of $畏_{b,c}$ production in proton collisions to access the gluon transverse-momentum dependent parton distributions (TMDs). In particular, we explore the phenomenology of the unpolarized and linearly-polarized gluon TMDs in unpolarized collisions for different kinematic settings, and the potential of a fixed-target experiment at the LHC. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.06252v2-abstract-full').style.display = 'none'; document.getElementById('2208.06252v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 August, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 August, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 1 figure. Presented by F.G. Celiberto at DIS2022: XXIX International Workshop on Deep-Inelastic Scattering and Related Subjects, Santiago de Compostela, Spain, May 2-6 2022</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2206.07815">arXiv:2206.07815</a> <span> [<a href="https://arxiv.org/pdf/2206.07815">pdf</a>, <a href="https://arxiv.org/format/2206.07815">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> </div> </div> <p class="title is-5 mathjax"> Unveiling the proton structure via transverse-momentum-dependent gluon distributions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Celiberto%2C+F+G">Francesco Giovanni Celiberto</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</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="2206.07815v1-abstract-short" style="display: inline;"> We present exploratory studies of the proton content via unpolarized and polarized transverse-momentum-dependent gluon distributions in the proton at leading twist. We make use of an enhanced spectator-model approach to encode in our densities both small- and moderate-$x$ effects. These studies are relevant to the investigation of the inner structure of hadrons via tomographic analyses at new-gene… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.07815v1-abstract-full').style.display = 'inline'; document.getElementById('2206.07815v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2206.07815v1-abstract-full" style="display: none;"> We present exploratory studies of the proton content via unpolarized and polarized transverse-momentum-dependent gluon distributions in the proton at leading twist. We make use of an enhanced spectator-model approach to encode in our densities both small- and moderate-$x$ effects. These studies are relevant to the investigation of the inner structure of hadrons via tomographic analyses at new-generation colliding machines. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.07815v1-abstract-full').style.display = 'none'; document.getElementById('2206.07815v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 June, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">5 pages, 1 figure, presented by F.G. Celiberto, contribution to the proceedings of the 19th International Conference on Hadron Spectroscopy and Structure in memoriam Simon Eidelman (HADRON2021), version accepted for publication in Rev. Mex. Phys</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2206.07598">arXiv:2206.07598</a> <span> [<a href="https://arxiv.org/pdf/2206.07598">pdf</a>, <a href="https://arxiv.org/format/2206.07598">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/JHEP10(2022)127">10.1007/JHEP10(2022)127 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Unpolarized Transverse Momentum Distributions from a global fit of Drell-Yan and Semi-Inclusive Deep-Inelastic Scattering data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Bertone%2C+V">Valerio Bertone</a>, <a href="/search/?searchtype=author&query=Bissolotti%2C+C">Chiara Bissolotti</a>, <a href="/search/?searchtype=author&query=Bozzi%2C+G">Giuseppe Bozzi</a>, <a href="/search/?searchtype=author&query=Cerutti%2C+M">Matteo Cerutti</a>, <a href="/search/?searchtype=author&query=Piacenza%2C+F">Fulvio Piacenza</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</a>, <a href="/search/?searchtype=author&query=Signori%2C+A">Andrea Signori</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="2206.07598v2-abstract-short" style="display: inline;"> We present an extraction of unpolarized transverse-momentum-dependent parton distribution and fragmentation functions based on more than two thousands data points from several experiments for two different processes: semi-inclusive deep-inelastic scattering and Drell-Yan production of lepton pairs. The baseline analysis is performed with a Monte Carlo replica method resumming large logarithms at N… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.07598v2-abstract-full').style.display = 'inline'; document.getElementById('2206.07598v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2206.07598v2-abstract-full" style="display: none;"> We present an extraction of unpolarized transverse-momentum-dependent parton distribution and fragmentation functions based on more than two thousands data points from several experiments for two different processes: semi-inclusive deep-inelastic scattering and Drell-Yan production of lepton pairs. The baseline analysis is performed with a Monte Carlo replica method resumming large logarithms at N3LL accuracy. The resulting description of the data is very good ($蠂^2/N_{\rm dat} = 1.06$). For semi-inclusive deep-inelastic scattering, predictions for multiplicities are normalized by factors that cure the discrepancy with data introduced by higher-order perturbative corrections. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.07598v2-abstract-full').style.display = 'none'; document.getElementById('2206.07598v2-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 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 June, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">Version accepted for publication. Results unchanged, only some clarifications have been added</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.13199">arXiv:2203.13199</a> <span> [<a href="https://arxiv.org/pdf/2203.13199">pdf</a>, <a href="https://arxiv.org/format/2203.13199">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> </div> <p class="title is-5 mathjax"> Snowmass 2021 White Paper: Electron Ion Collider for High Energy Physics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Khalek%2C+R+A">R. Abdul Khalek</a>, <a href="/search/?searchtype=author&query=D%27Alesio%2C+U">U. D'Alesio</a>, <a href="/search/?searchtype=author&query=Arratia%2C+M">M. Arratia</a>, <a href="/search/?searchtype=author&query=Bacchetta%2C+A">A. Bacchetta</a>, <a href="/search/?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/?searchtype=author&query=Begel%2C+M">M. Begel</a>, <a href="/search/?searchtype=author&query=Boglione%2C+M">M. Boglione</a>, <a href="/search/?searchtype=author&query=Boughezal%2C+R">R. Boughezal</a>, <a href="/search/?searchtype=author&query=Boussarie%2C+R">R. Boussarie</a>, <a href="/search/?searchtype=author&query=Bozzi%2C+G">G. Bozzi</a>, <a href="/search/?searchtype=author&query=Chekanov%2C+S+V">S. V. Chekanov</a>, <a href="/search/?searchtype=author&query=Celiberto%2C+F+G">F. G. Celiberto</a>, <a href="/search/?searchtype=author&query=Chirilli%2C+G">G. Chirilli</a>, <a href="/search/?searchtype=author&query=Cridge%2C+T">T. Cridge</a>, <a href="/search/?searchtype=author&query=Cruz-Torres%2C+R">R. Cruz-Torres</a>, <a href="/search/?searchtype=author&query=Corliss%2C+R">R. Corliss</a>, <a href="/search/?searchtype=author&query=Cotton%2C+C">C. Cotton</a>, <a href="/search/?searchtype=author&query=Davoudiasl%2C+H">H. Davoudiasl</a>, <a href="/search/?searchtype=author&query=Deshpande%2C+A">A. Deshpande</a>, <a href="/search/?searchtype=author&query=Dong%2C+X">X. Dong</a>, <a href="/search/?searchtype=author&query=Emmert%2C+A">A. Emmert</a>, <a href="/search/?searchtype=author&query=Fazio%2C+S">S. Fazio</a>, <a href="/search/?searchtype=author&query=Forte%2C+S">S. Forte</a>, <a href="/search/?searchtype=author&query=Furletova%2C+Y">Y. Furletova</a>, <a href="/search/?searchtype=author&query=Gal%2C+C">C. Gal</a> , et al. (83 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2203.13199v2-abstract-short" style="display: inline;"> Electron Ion Collider (EIC) is a particle accelerator facility planned for construction at Brookhaven National Laboratory on Long Island, New York by the United States Department of Energy. EIC will provide capabilities of colliding beams of polarized electrons with polarized beams of proton and light ions. EIC will be one of the largest and most sophisticated new accelerator facilities worldwide,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.13199v2-abstract-full').style.display = 'inline'; document.getElementById('2203.13199v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.13199v2-abstract-full" style="display: none;"> Electron Ion Collider (EIC) is a particle accelerator facility planned for construction at Brookhaven National Laboratory on Long Island, New York by the United States Department of Energy. EIC will provide capabilities of colliding beams of polarized electrons with polarized beams of proton and light ions. EIC will be one of the largest and most sophisticated new accelerator facilities worldwide, and the only new large-scale accelerator facility planned for construction in the United States in the next few decades. The versatility, resolving power and intensity of EIC will present many new opportunities to address some of the crucial and fundamental open scientific questions in particle physics. This document provides an overview of the science case of EIC from the perspective of the high energy physics community. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.13199v2-abstract-full').style.display = 'none'; document.getElementById('2203.13199v2-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 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Submitted to the Proceedings of the US Community Study on the Future of Particle Physics (Snowmass 2021)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.05090">arXiv:2203.05090</a> <span> [<a href="https://arxiv.org/pdf/2203.05090">pdf</a>, <a href="https://arxiv.org/format/2203.05090">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="Cosmology and Nongalactic Astrophysics">astro-ph.CO</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="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/10.1088/1361-6471/ac865e">10.1088/1361-6471/ac865e <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Forward Physics Facility at the High-Luminosity LHC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Feng%2C+J+L">Jonathan L. Feng</a>, <a href="/search/?searchtype=author&query=Kling%2C+F">Felix Kling</a>, <a href="/search/?searchtype=author&query=Reno%2C+M+H">Mary Hall Reno</a>, <a href="/search/?searchtype=author&query=Rojo%2C+J">Juan Rojo</a>, <a href="/search/?searchtype=author&query=Soldin%2C+D">Dennis Soldin</a>, <a href="/search/?searchtype=author&query=Anchordoqui%2C+L+A">Luis A. Anchordoqui</a>, <a href="/search/?searchtype=author&query=Boyd%2C+J">Jamie Boyd</a>, <a href="/search/?searchtype=author&query=Ismail%2C+A">Ahmed Ismail</a>, <a href="/search/?searchtype=author&query=Harland-Lang%2C+L">Lucian Harland-Lang</a>, <a href="/search/?searchtype=author&query=Kelly%2C+K+J">Kevin J. Kelly</a>, <a href="/search/?searchtype=author&query=Pandey%2C+V">Vishvas Pandey</a>, <a href="/search/?searchtype=author&query=Trojanowski%2C+S">Sebastian Trojanowski</a>, <a href="/search/?searchtype=author&query=Tsai%2C+Y">Yu-Dai Tsai</a>, <a href="/search/?searchtype=author&query=Alameddine%2C+J">Jean-Marco Alameddine</a>, <a href="/search/?searchtype=author&query=Araki%2C+T">Takeshi Araki</a>, <a href="/search/?searchtype=author&query=Ariga%2C+A">Akitaka Ariga</a>, <a href="/search/?searchtype=author&query=Ariga%2C+T">Tomoko Ariga</a>, <a href="/search/?searchtype=author&query=Asai%2C+K">Kento Asai</a>, <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Balazs%2C+K">Kincso Balazs</a>, <a href="/search/?searchtype=author&query=Barr%2C+A+J">Alan J. Barr</a>, <a href="/search/?searchtype=author&query=Battistin%2C+M">Michele Battistin</a>, <a href="/search/?searchtype=author&query=Bian%2C+J">Jianming Bian</a>, <a href="/search/?searchtype=author&query=Bertone%2C+C">Caterina Bertone</a>, <a href="/search/?searchtype=author&query=Bai%2C+W">Weidong Bai</a> , et al. (211 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2203.05090v1-abstract-short" style="display: inline;"> High energy collisions at the High-Luminosity Large Hadron Collider (LHC) produce a large number of particles along the beam collision axis, outside of the acceptance of existing LHC experiments. The proposed Forward Physics Facility (FPF), to be located several hundred meters from the ATLAS interaction point and shielded by concrete and rock, will host a suite of experiments to probe Standard Mod… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.05090v1-abstract-full').style.display = 'inline'; document.getElementById('2203.05090v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.05090v1-abstract-full" style="display: none;"> High energy collisions at the High-Luminosity Large Hadron Collider (LHC) produce a large number of particles along the beam collision axis, outside of the acceptance of existing LHC experiments. The proposed Forward Physics Facility (FPF), to be located several hundred meters from the ATLAS interaction point and shielded by concrete and rock, will host a suite of experiments to probe Standard Model (SM) processes and search for physics beyond the Standard Model (BSM). In this report, we review the status of the civil engineering plans and the experiments to explore the diverse physics signals that can be uniquely probed in the forward region. FPF experiments will be sensitive to a broad range of BSM physics through searches for new particle scattering or decay signatures and deviations from SM expectations in high statistics analyses with TeV neutrinos in this low-background environment. High statistics neutrino detection will also provide valuable data for fundamental topics in perturbative and non-perturbative QCD and in weak interactions. Experiments at the FPF will enable synergies between forward particle production at the LHC and astroparticle physics to be exploited. We report here on these physics topics, on infrastructure, detector, and simulation studies, and on future directions to realize the FPF's physics potential. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.05090v1-abstract-full').style.display = 'none'; document.getElementById('2203.05090v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">429 pages, contribution to Snowmass 2021</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> UCI-TR-2022-01, CERN-PBC-Notes-2022-001, FERMILAB-PUB-22-094-ND-SCD-T, INT-PUB-22-006, BONN-TH-2022-04 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2201.10508">arXiv:2201.10508</a> <span> [<a href="https://arxiv.org/pdf/2201.10508">pdf</a>, <a href="https://arxiv.org/ps/2201.10508">ps</a>, <a href="https://arxiv.org/format/2201.10508">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> </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/10.7566/JPSCP.37.020124">10.7566/JPSCP.37.020124 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Towards leading-twist $T$-odd TMD gluon distributions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Celiberto%2C+F+G">Francesco Giovanni Celiberto</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</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="2201.10508v2-abstract-short" style="display: inline;"> We present exploratory studies of the 3D proton tomography through polarized $T$-odd gluon TMDs at leading twist, obtained in a spectator-model framework. We embody in our approach a flexible parameterization for the spectator-mass spectral function, suited to catch both small- and moderate-$x$ effects. All these studies are relevant to unveil the gluon dynamics inside hadrons, which represents a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.10508v2-abstract-full').style.display = 'inline'; document.getElementById('2201.10508v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2201.10508v2-abstract-full" style="display: none;"> We present exploratory studies of the 3D proton tomography through polarized $T$-odd gluon TMDs at leading twist, obtained in a spectator-model framework. We embody in our approach a flexible parameterization for the spectator-mass spectral function, suited to catch both small- and moderate-$x$ effects. All these studies are relevant to unveil the gluon dynamics inside hadrons, which represents a core research line of studies at new-generation colliders, such as the Electron-Ion Collider, NICA-SPD, the High-Luminosity LHC, and the Forward Physics Facility. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.10508v2-abstract-full').style.display = 'none'; document.getElementById('2201.10508v2-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 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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">5 pages, 1 figure, presented by F.G. Celiberto at the the 24th International Spin Symposium (SPIN2021), 18-22 October 2021, Matsue, Shimane Prefecture, Japan</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2111.03567">arXiv:2111.03567</a> <span> [<a href="https://arxiv.org/pdf/2111.03567">pdf</a>, <a href="https://arxiv.org/format/2111.03567">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> </div> </div> <p class="title is-5 mathjax"> Toward twist-2 $T$-odd transverse-momentum-dependent gluon distributions: the $f$-type linearity function </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Celiberto%2C+F+G">Francesco Giovanni Celiberto</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</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="2111.03567v2-abstract-short" style="display: inline;"> We present preliminary results on the leading-twist transverse-momentum-dependent (TMD) gluon linearity function, which is directly connected to nucleon transverse-spin asymmetries originating from the density of linearly-polarized gluons. The function is calculated in a spectator-model framework for the parent proton and for the $f$-type gauge-link structure. Our work represents a further step to… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.03567v2-abstract-full').style.display = 'inline'; document.getElementById('2111.03567v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2111.03567v2-abstract-full" style="display: none;"> We present preliminary results on the leading-twist transverse-momentum-dependent (TMD) gluon linearity function, which is directly connected to nucleon transverse-spin asymmetries originating from the density of linearly-polarized gluons. The function is calculated in a spectator-model framework for the parent proton and for the $f$-type gauge-link structure. Our work represents a further step toward the definition of a complete set of gluon TMD distributions at twist-2 that can be used to access the gluon dynamics inside nucleons and nuclei at new-generation colliders. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.03567v2-abstract-full').style.display = 'none'; document.getElementById('2111.03567v2-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 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 November, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">5 pages, 1 figure. Presented by F.G. Celiberto at the 22nd Particles and Nuclei International Conference (PANIC2021), 5-10 September 2021; version accepted for publication in the conference proceedings by PoS</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2111.01686">arXiv:2111.01686</a> <span> [<a href="https://arxiv.org/pdf/2111.01686">pdf</a>, <a href="https://arxiv.org/format/2111.01686">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> </div> </div> <p class="title is-5 mathjax"> Toward twist-2 $T$-odd transverse-momentum-dependent gluon distributions: the $f$-type Sivers function </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Celiberto%2C+F+G">Francesco Giovanni Celiberto</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</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="2111.01686v2-abstract-short" style="display: inline;"> We report progresses on leading-twist transverse-momentum-dependent (TMD) gluon distributions, calculated in a spectator-model framework for the parent nucleon. We encode in our formalism a fit-based parameterization for the spectator-mass density, suited to describe the gluon content of the proton in a wide range of $x$. We present preliminary results on the $f$-type Sivers function, a key ingred… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.01686v2-abstract-full').style.display = 'inline'; document.getElementById('2111.01686v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2111.01686v2-abstract-full" style="display: none;"> We report progresses on leading-twist transverse-momentum-dependent (TMD) gluon distributions, calculated in a spectator-model framework for the parent nucleon. We encode in our formalism a fit-based parameterization for the spectator-mass density, suited to describe the gluon content of the proton in a wide range of $x$. We present preliminary results on the $f$-type Sivers function, a key ingredient to access relevant spin-asymmetries emerging when the nucleon is transversely polarized. These studies are helpful to shed light on the gluon dynamics inside nucleons and nuclei, which is one of the primary goals of new-generation colliding facilities, as the Electron-Ion Collider, the High-Luminosity LHC, NICA-SPD, and the Forward Physics Facility. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.01686v2-abstract-full').style.display = 'none'; document.getElementById('2111.01686v2-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 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 November, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 2 figures. Presented by F.G. Celiberto at the European Physical Society Conference on High Energy Physics (EPS-HEP2021), 26-30 July 2021; version accepted for publication in the conference proceedings by PoS</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2107.13446">arXiv:2107.13446</a> <span> [<a href="https://arxiv.org/pdf/2107.13446">pdf</a>, <a href="https://arxiv.org/format/2107.13446">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> </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/10.21468/ScipostPhysProc.8.040">10.21468/ScipostPhysProc.8.040 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A spectator-model way to transverse-momentum-dependent gluon distribution functions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Celiberto%2C+F+G">Francesco Giovanni Celiberto</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</a>, <a href="/search/?searchtype=author&query=Taels%2C+P">Pieter Taels</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2107.13446v4-abstract-short" style="display: inline;"> We present exploratory analyses of the 3D gluon content of the proton via a study of unpolarized and polarized gluon TMDs at twist-2, calculated in a spectator model for the parent nucleon. Our approach embodies a flexible parametrization for the spectator-mass function, suited to describe both moderate and small-$x$ effects. All these studies can serve as a useful guidance in the investigation of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.13446v4-abstract-full').style.display = 'inline'; document.getElementById('2107.13446v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2107.13446v4-abstract-full" style="display: none;"> We present exploratory analyses of the 3D gluon content of the proton via a study of unpolarized and polarized gluon TMDs at twist-2, calculated in a spectator model for the parent nucleon. Our approach embodies a flexible parametrization for the spectator-mass function, suited to describe both moderate and small-$x$ effects. All these studies can serve as a useful guidance in the investigation of the gluon dynamics inside nucleons and nuclei, which constitutes one of the major goals of new-generation colliding machines, as the EIC, the HL-LHC, NICA, and the FPF. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.13446v4-abstract-full').style.display = 'none'; document.getElementById('2107.13446v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 August, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 2 figures, contribution to the proceedings of the XXVIII International Workshop on Deep Inelastic Scattering and Related Subjects (DIS2021), Stony Brook, New York, USA, 12-16 April, 2021, version accepted for publication on SciPost Physics Proceedings</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> SciPost Phys. Proc. 8, 040 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2107.06772">arXiv:2107.06772</a> <span> [<a href="https://arxiv.org/pdf/2107.06772">pdf</a>, <a href="https://arxiv.org/ps/2107.06772">ps</a>, <a href="https://arxiv.org/format/2107.06772">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> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epja/i2016-16163-5">10.1140/epja/i2016-16163-5 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Where do we stand with a 3-D picture of the proton? </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2107.06772v1-abstract-short" style="display: inline;"> We are on the way to obtaining multi-dimensional "pictures" of the proton. The field is bursting with activities, both from the theoretical and experimental side. A brief selection of important achievements of the last years and open challenges for the future is presented. They are already well documented in the various reviews of this Special Issue, but they are gathered here in a more condensed… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.06772v1-abstract-full').style.display = 'inline'; document.getElementById('2107.06772v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2107.06772v1-abstract-full" style="display: none;"> We are on the way to obtaining multi-dimensional "pictures" of the proton. The field is bursting with activities, both from the theoretical and experimental side. A brief selection of important achievements of the last years and open challenges for the future is presented. They are already well documented in the various reviews of this Special Issue, but they are gathered here in a more condensed way for convenience, together with some additional remarks. The choice of the items included in this short overview is far from being complete and represents the view of the author. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.06772v1-abstract-full').style.display = 'none'; document.getElementById('2107.06772v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Article published in 2016 as a contribution to the EPJA Special Issue on "3D Structure of the Nucleon"</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur.Phys.J.A 52 (2016) 6, 163 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2103.09741">arXiv:2103.09741</a> <span> [<a href="https://arxiv.org/pdf/2103.09741">pdf</a>, <a href="https://arxiv.org/format/2103.09741">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjc/s10052-021-09508-8">10.1140/epjc/s10052-021-09508-8 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> TMDlib2 and TMDplotter: a platform for 3D hadron structure studies </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Abdulov%2C+N+A">N. A. Abdulov</a>, <a href="/search/?searchtype=author&query=Bacchetta%2C+A">A. Bacchetta</a>, <a href="/search/?searchtype=author&query=Baranov%2C+S">S. Baranov</a>, <a href="/search/?searchtype=author&query=Martinez%2C+A+B">A. Bermudez Martinez</a>, <a href="/search/?searchtype=author&query=Bertone%2C+V">V. Bertone</a>, <a href="/search/?searchtype=author&query=Bissolotti%2C+C">C. Bissolotti</a>, <a href="/search/?searchtype=author&query=Candelise%2C+V">V. Candelise</a>, <a href="/search/?searchtype=author&query=Banos%2C+L+I+E">L. I. Estevez Banos</a>, <a href="/search/?searchtype=author&query=Bury%2C+M">M. Bury</a>, <a href="/search/?searchtype=author&query=Connor%2C+P+L+S">P. L. S. Connor</a>, <a href="/search/?searchtype=author&query=Favart%2C+L">L. Favart</a>, <a href="/search/?searchtype=author&query=Guzman%2C+F">F. Guzman</a>, <a href="/search/?searchtype=author&query=Hautmann%2C+F">F. Hautmann</a>, <a href="/search/?searchtype=author&query=Hentschinski%2C+M">M. Hentschinski</a>, <a href="/search/?searchtype=author&query=Jung%2C+H">H. Jung</a>, <a href="/search/?searchtype=author&query=Keersmaekers%2C+L">L. Keersmaekers</a>, <a href="/search/?searchtype=author&query=Kotikov%2C+A">A. Kotikov</a>, <a href="/search/?searchtype=author&query=Kusina%2C+A">A. Kusina</a>, <a href="/search/?searchtype=author&query=Kutak%2C+K">K. Kutak</a>, <a href="/search/?searchtype=author&query=Lelek%2C+A">A. Lelek</a>, <a href="/search/?searchtype=author&query=Lidrych%2C+J">J. Lidrych</a>, <a href="/search/?searchtype=author&query=Lipatov%2C+A">A. Lipatov</a>, <a href="/search/?searchtype=author&query=Lykasov%2C+G">G. Lykasov</a>, <a href="/search/?searchtype=author&query=Malyshev%2C+M">M. Malyshev</a>, <a href="/search/?searchtype=author&query=Mendizabal%2C+M">M. Mendizabal</a> , et al. (13 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2103.09741v2-abstract-short" style="display: inline;"> A common library, TMDlib2, for Transverse-Momentum-Dependent distributions (TMDs) and unintegrated parton distributions (uPDFs) is described, which allows for easy access of commonly used TMDs and uPDFs, providing a three-dimensional (3D) picture of the partonic structure of hadrons. The tool TMDplotter allows for web-based plotting of distributions implemented in TMDlib2, together with collinear… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.09741v2-abstract-full').style.display = 'inline'; document.getElementById('2103.09741v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2103.09741v2-abstract-full" style="display: none;"> A common library, TMDlib2, for Transverse-Momentum-Dependent distributions (TMDs) and unintegrated parton distributions (uPDFs) is described, which allows for easy access of commonly used TMDs and uPDFs, providing a three-dimensional (3D) picture of the partonic structure of hadrons. The tool TMDplotter allows for web-based plotting of distributions implemented in TMDlib2, together with collinear pdfs as available in LHAPDF. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.09741v2-abstract-full').style.display = 'none'; document.getElementById('2103.09741v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 August, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">18 pages, 3 figures. Updated with version published in EPJC</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> DESY 21-026, IFJPAN-IV-2021-4, JLAB-THY-21-3337 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2103.05419">arXiv:2103.05419</a> <span> [<a href="https://arxiv.org/pdf/2103.05419">pdf</a>, <a href="https://arxiv.org/format/2103.05419">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nuclphysa.2022.122447">10.1016/j.nuclphysa.2022.122447 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Science Requirements and Detector Concepts for the Electron-Ion Collider: EIC Yellow Report </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Khalek%2C+R+A">R. Abdul Khalek</a>, <a href="/search/?searchtype=author&query=Accardi%2C+A">A. Accardi</a>, <a href="/search/?searchtype=author&query=Adam%2C+J">J. Adam</a>, <a href="/search/?searchtype=author&query=Adamiak%2C+D">D. Adamiak</a>, <a href="/search/?searchtype=author&query=Akers%2C+W">W. Akers</a>, <a href="/search/?searchtype=author&query=Albaladejo%2C+M">M. Albaladejo</a>, <a href="/search/?searchtype=author&query=Al-bataineh%2C+A">A. Al-bataineh</a>, <a href="/search/?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/?searchtype=author&query=Ameli%2C+F">F. Ameli</a>, <a href="/search/?searchtype=author&query=Antonioli%2C+P">P. Antonioli</a>, <a href="/search/?searchtype=author&query=Armesto%2C+N">N. Armesto</a>, <a href="/search/?searchtype=author&query=Armstrong%2C+W+R">W. R. Armstrong</a>, <a href="/search/?searchtype=author&query=Arratia%2C+M">M. Arratia</a>, <a href="/search/?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/?searchtype=author&query=Asaturyan%2C+A">A. Asaturyan</a>, <a href="/search/?searchtype=author&query=Asai%2C+M">M. Asai</a>, <a href="/search/?searchtype=author&query=Aschenauer%2C+E+C">E. C. Aschenauer</a>, <a href="/search/?searchtype=author&query=Aune%2C+S">S. Aune</a>, <a href="/search/?searchtype=author&query=Avagyan%2C+H">H. Avagyan</a>, <a href="/search/?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/?searchtype=author&query=Azmoun%2C+B">B. Azmoun</a>, <a href="/search/?searchtype=author&query=Bacchetta%2C+A">A. Bacchetta</a>, <a href="/search/?searchtype=author&query=Baker%2C+M+D">M. D. Baker</a>, <a href="/search/?searchtype=author&query=Barbosa%2C+F">F. Barbosa</a>, <a href="/search/?searchtype=author&query=Barion%2C+L">L. Barion</a> , et al. (390 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2103.05419v3-abstract-short" style="display: inline;"> This report describes the physics case, the resulting detector requirements, and the evolving detector concepts for the experimental program at the Electron-Ion Collider (EIC). The EIC will be a powerful new high-luminosity facility in the United States with the capability to collide high-energy electron beams with high-energy proton and ion beams, providing access to those regions in the nucleon… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.05419v3-abstract-full').style.display = 'inline'; document.getElementById('2103.05419v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2103.05419v3-abstract-full" style="display: none;"> This report describes the physics case, the resulting detector requirements, and the evolving detector concepts for the experimental program at the Electron-Ion Collider (EIC). The EIC will be a powerful new high-luminosity facility in the United States with the capability to collide high-energy electron beams with high-energy proton and ion beams, providing access to those regions in the nucleon and nuclei where their structure is dominated by gluons. Moreover, polarized beams in the EIC will give unprecedented access to the spatial and spin structure of the proton, neutron, and light ions. The studies leading to this document were commissioned and organized by the EIC User Group with the objective of advancing the state and detail of the physics program and developing detector concepts that meet the emerging requirements in preparation for the realization of the EIC. The effort aims to provide the basis for further development of concepts for experimental equipment best suited for the science needs, including the importance of two complementary detectors and interaction regions. This report consists of three volumes. Volume I is an executive summary of our findings and developed concepts. In Volume II we describe studies of a wide range of physics measurements and the emerging requirements on detector acceptance and performance. Volume III discusses general-purpose detector concepts and the underlying technologies to meet the physics requirements. These considerations will form the basis for a world-class experimental program that aims to increase our understanding of the fundamental structure of all visible matter <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.05419v3-abstract-full').style.display = 'none'; document.getElementById('2103.05419v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">902 pages, 415 authors, 151 institutions</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> BNL-220990-2021-FORE, JLAB-PHY-21-3198, LA-UR-21-20953 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl. Phys. A 1026 (2022) 122447 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2011.15005">arXiv:2011.15005</a> <span> [<a href="https://arxiv.org/pdf/2011.15005">pdf</a>, <a href="https://arxiv.org/ps/2011.15005">ps</a>, <a href="https://arxiv.org/format/2011.15005">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> <p class="title is-5 mathjax"> On the physics potential to study the gluon content of proton and deuteron at NICA SPD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Arbuzov%2C+A">A. Arbuzov</a>, <a href="/search/?searchtype=author&query=Bacchetta%2C+A">A. Bacchetta</a>, <a href="/search/?searchtype=author&query=Butenschoen%2C+M">M. Butenschoen</a>, <a href="/search/?searchtype=author&query=Celiberto%2C+F+G">F. G. Celiberto</a>, <a href="/search/?searchtype=author&query=D%27Alesio%2C+U">U. D'Alesio</a>, <a href="/search/?searchtype=author&query=Deka%2C+M">M. Deka</a>, <a href="/search/?searchtype=author&query=Denisenko%2C+I">I. Denisenko</a>, <a href="/search/?searchtype=author&query=Echevarria%2C+M+G">M. G. Echevarria</a>, <a href="/search/?searchtype=author&query=Efremov%2C+A">A. Efremov</a>, <a href="/search/?searchtype=author&query=Ivanov%2C+N+Y">N. Ya. Ivanov</a>, <a href="/search/?searchtype=author&query=Guskov%2C+A">A. Guskov</a>, <a href="/search/?searchtype=author&query=Karpishkov%2C+A">A. Karpishkov</a>, <a href="/search/?searchtype=author&query=Klopot%2C+Y">Ya. Klopot</a>, <a href="/search/?searchtype=author&query=Kniehl%2C+B+A">B. A. Kniehl</a>, <a href="/search/?searchtype=author&query=Kotzinian%2C+A">A. Kotzinian</a>, <a href="/search/?searchtype=author&query=Kumano%2C+S">S. Kumano</a>, <a href="/search/?searchtype=author&query=Lansberg%2C+J+P">J. P. Lansberg</a>, <a href="/search/?searchtype=author&query=Liu%2C+K">Keh-Fei Liu</a>, <a href="/search/?searchtype=author&query=Murgia%2C+F">F. Murgia</a>, <a href="/search/?searchtype=author&query=Nefedov%2C+M">M. Nefedov</a>, <a href="/search/?searchtype=author&query=Parsamyan%2C+B">B. Parsamyan</a>, <a href="/search/?searchtype=author&query=Pisano%2C+C">C. Pisano</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">M. Radici</a>, <a href="/search/?searchtype=author&query=Rymbekova%2C+A">A. Rymbekova</a>, <a href="/search/?searchtype=author&query=Saleev%2C+V">V. Saleev</a> , et al. (3 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2011.15005v4-abstract-short" style="display: inline;"> The Spin Physics Detector (SPD) is a future multipurpose experiment foreseen to run at the NICA collider, which is currently under construction at the Joint Institute for Nuclear Research (JINR, Dubna, Russia). The physics program of the experiment is based on collisions of longitudinally and transversely polarized protons and deuterons at $\sqrt{s}$ up to 27 GeV and luminosity up to 10$^{32}$ cm… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.15005v4-abstract-full').style.display = 'inline'; document.getElementById('2011.15005v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2011.15005v4-abstract-full" style="display: none;"> The Spin Physics Detector (SPD) is a future multipurpose experiment foreseen to run at the NICA collider, which is currently under construction at the Joint Institute for Nuclear Research (JINR, Dubna, Russia). The physics program of the experiment is based on collisions of longitudinally and transversely polarized protons and deuterons at $\sqrt{s}$ up to 27 GeV and luminosity up to 10$^{32}$ cm$^{-2}$ s$^{-1}$. The SPD will operate as a universal facility for comprehensive study of unpolarized and polarized gluon content of the nucleon, using different complementary probes such as: charmonia, open charm, and prompt photon production processes. The aim of this work is to make a thorough review of the physics objectives that can potentially be addressed at the SPD, underlining related theoretical aspects and discussing relevant experimental results when available. Among different pertinent phenomena particular attention is drawn to the study of the gluon helicity, gluon Sivers and Boer-Mulders functions in the nucleon, as well as the gluon transversity distribution in the deuteron, via the measurement of specific single and double spin asymmetries. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.15005v4-abstract-full').style.display = 'none'; document.getElementById('2011.15005v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">arXiv admin note: text overlap with arXiv:2102.00442</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2007.07755">arXiv:2007.07755</a> <span> [<a href="https://arxiv.org/pdf/2007.07755">pdf</a>, <a href="https://arxiv.org/format/2007.07755">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Azimuthal single- and double-spin asymmetries in semi-inclusive deep-inelastic lepton scattering by transversely polarized protons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=HERMES+Collaboration"> HERMES Collaboration</a>, <a href="/search/?searchtype=author&query=Airapetian%2C+A">A. Airapetian</a>, <a href="/search/?searchtype=author&query=Akopov%2C+N">N. Akopov</a>, <a href="/search/?searchtype=author&query=Akopov%2C+Z">Z. Akopov</a>, <a href="/search/?searchtype=author&query=Aschenauer%2C+E+C">E. C. Aschenauer</a>, <a href="/search/?searchtype=author&query=Augustyniak%2C+W">W. Augustyniak</a>, <a href="/search/?searchtype=author&query=Avakian%2C+R">R. Avakian</a>, <a href="/search/?searchtype=author&query=Bacchetta%2C+A">A. Bacchetta</a>, <a href="/search/?searchtype=author&query=Belostotski%2C+S">S. Belostotski</a>, <a href="/search/?searchtype=author&query=Bryzgalov%2C+V">V. Bryzgalov</a>, <a href="/search/?searchtype=author&query=Capitani%2C+G+P">G. P. Capitani</a>, <a href="/search/?searchtype=author&query=Cisbani%2C+E">E. Cisbani</a>, <a href="/search/?searchtype=author&query=Ciullo%2C+G">G. Ciullo</a>, <a href="/search/?searchtype=author&query=Contalbrigo%2C+M">M. Contalbrigo</a>, <a href="/search/?searchtype=author&query=Deconinck%2C+W">W. Deconinck</a>, <a href="/search/?searchtype=author&query=De+Leo%2C+R">R. De Leo</a>, <a href="/search/?searchtype=author&query=De+Sanctis%2C+E">E. De Sanctis</a>, <a href="/search/?searchtype=author&query=Diefenthaler%2C+M">M. Diefenthaler</a>, <a href="/search/?searchtype=author&query=Di+Nezza%2C+P">P. Di Nezza</a>, <a href="/search/?searchtype=author&query=D%C3%BCren%2C+M">M. D眉ren</a>, <a href="/search/?searchtype=author&query=Elbakian%2C+G">G. Elbakian</a>, <a href="/search/?searchtype=author&query=Ellinghaus%2C+F">F. Ellinghaus</a>, <a href="/search/?searchtype=author&query=Fantoni%2C+A">A. Fantoni</a>, <a href="/search/?searchtype=author&query=Felawka%2C+L">L. Felawka</a>, <a href="/search/?searchtype=author&query=Gavrilov%2C+G">G. Gavrilov</a> , et al. (50 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2007.07755v1-abstract-short" style="display: inline;"> A comprehensive set of azimuthal single-spin and double-spin asymmetries in semi-inclusive leptoproduction of pions, charged kaons, protons, and antiprotons from transversely polarized protons is presented. These asymmetries include the previously published HERMES results on Collins and Sivers asymmetries, the analysis of which has been extended to include protons and antiprotons and also to an ex… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.07755v1-abstract-full').style.display = 'inline'; document.getElementById('2007.07755v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2007.07755v1-abstract-full" style="display: none;"> A comprehensive set of azimuthal single-spin and double-spin asymmetries in semi-inclusive leptoproduction of pions, charged kaons, protons, and antiprotons from transversely polarized protons is presented. These asymmetries include the previously published HERMES results on Collins and Sivers asymmetries, the analysis of which has been extended to include protons and antiprotons and also to an extraction in a three-dimensional kinematic binning and enlarged phase space. They are complemented by corresponding results for the remaining four single-spin and four double-spin asymmetries allowed in the one-photon-exchange approximation of the semi-inclusive deep-inelastic scattering process for target-polarization orientation perpendicular to the direction of the incoming lepton beam. Among those results, significant non-vanishing $\cos{蠁-蠁_S}$ modulations provide evidence for a sizable worm-gear (II) distribution, $g_{1T}$. Most of the other modulations are found to be consistent with zero with the notable exception of large $\sin{蠁_S}$ modulations for charged pions and positive kaons. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.07755v1-abstract-full').style.display = 'none'; document.getElementById('2007.07755v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 July, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> DESY-20-119 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2005.02288">arXiv:2005.02288</a> <span> [<a href="https://arxiv.org/pdf/2005.02288">pdf</a>, <a href="https://arxiv.org/format/2005.02288">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> </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/s10052-020-8327-6">10.1140/epjc/s10052-020-8327-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Transverse-momentum-dependent gluon distribution functions in a spectator model </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Celiberto%2C+F+G">Francesco Giovanni Celiberto</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</a>, <a href="/search/?searchtype=author&query=Taels%2C+P">Pieter Taels</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="2005.02288v2-abstract-short" style="display: inline;"> We present a model calculation of transverse-momentum-dependent distributions (TMDs) of gluons in the nucleon. The model is based on the assumption that a nucleon can emit a gluon, and what remains after the emission is treated as a single spectator particle. This spectator particle is considered to be on-shell, but its mass is allowed to take a continuous range of values, described by a spectral… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.02288v2-abstract-full').style.display = 'inline'; document.getElementById('2005.02288v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2005.02288v2-abstract-full" style="display: none;"> We present a model calculation of transverse-momentum-dependent distributions (TMDs) of gluons in the nucleon. The model is based on the assumption that a nucleon can emit a gluon, and what remains after the emission is treated as a single spectator particle. This spectator particle is considered to be on-shell, but its mass is allowed to take a continuous range of values, described by a spectral function. The nucleon-gluon-spectator coupling is described by an effective vertex containing two form factors. We fix the model parameters to obtain the best agreement with collinear gluon distributions extracted from global fits. We study the tomography in momentum space of gluons inside nucleons for various combinations of their polarizations. These can be used to make predictions of observables relevant for gluon TMD studies at current and future collider facilities. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.02288v2-abstract-full').style.display = 'none'; document.getElementById('2005.02288v2-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, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">Small changes in the text. Correction after Eq. (5). Eq. (6) added. Fig. 1 slightly modified. Some references added. All results unchanged</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2004.14278">arXiv:2004.14278</a> <span> [<a href="https://arxiv.org/pdf/2004.14278">pdf</a>, <a href="https://arxiv.org/format/2004.14278">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2022.136961">10.1016/j.physletb.2022.136961 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The three-dimensional distribution of quarks in momentum space </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Delcarro%2C+F">Filippo Delcarro</a>, <a href="/search/?searchtype=author&query=Pisano%2C+C">Cristian Pisano</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2004.14278v2-abstract-short" style="display: inline;"> We present the distribution of unpolarized quarks in a transversely polarized proton in three-dimensional momentum space. Our results are based on consistent extractions of the unpolarized and Sivers transverse momentum dependent parton distributions (TMDs). </span> <span class="abstract-full has-text-grey-dark mathjax" id="2004.14278v2-abstract-full" style="display: none;"> We present the distribution of unpolarized quarks in a transversely polarized proton in three-dimensional momentum space. Our results are based on consistent extractions of the unpolarized and Sivers transverse momentum dependent parton distributions (TMDs). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2004.14278v2-abstract-full').style.display = 'none'; document.getElementById('2004.14278v2-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 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 April, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Several changes compared to first version. Additional equations inserted, additional explanations, inclusion of normalization errors, inclusion of Z and W data points and corresponding plots. Results remained qualitatively similar to first version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-THY-20-3186 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2002.12333">arXiv:2002.12333</a> <span> [<a href="https://arxiv.org/pdf/2002.12333">pdf</a>, <a href="https://arxiv.org/format/2002.12333">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> </div> <p class="title is-5 mathjax"> Probing Nucleons and Nuclei in High Energy Collisions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Aidala%2C+C+A">Christine A. Aidala</a>, <a href="/search/?searchtype=author&query=Aschenauer%2C+E">Elke Aschenauer</a>, <a href="/search/?searchtype=author&query=Aslan%2C+F">Fatma Aslan</a>, <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Balitsky%2C+I">Ian Balitsky</a>, <a href="/search/?searchtype=author&query=Benic%2C+S">Sanjin Benic</a>, <a href="/search/?searchtype=author&query=Bhattacharya%2C+S">Shohini Bhattacharya</a>, <a href="/search/?searchtype=author&query=Boglione%2C+M">Mariaelena Boglione</a>, <a href="/search/?searchtype=author&query=Burkardt%2C+M">Matthias Burkardt</a>, <a href="/search/?searchtype=author&query=Cammarota%2C+J">Justin Cammarota</a>, <a href="/search/?searchtype=author&query=Chirilli%2C+G+A">Giovanni A. Chirilli</a>, <a href="/search/?searchtype=author&query=Cocuzza%2C+C">Christopher Cocuzza</a>, <a href="/search/?searchtype=author&query=Courtoy%2C+A">Aurore Courtoy</a>, <a href="/search/?searchtype=author&query=de+Florian%2C+D">Daniel de Florian</a>, <a href="/search/?searchtype=author&query=Di+Nezza%2C+P">Pasquale Di Nezza</a>, <a href="/search/?searchtype=author&query=Dumitru%2C+A">Adrian Dumitru</a>, <a href="/search/?searchtype=author&query=Fucini%2C+S">Sara Fucini</a>, <a href="/search/?searchtype=author&query=Fukushima%2C+K">Kenji Fukushima</a>, <a href="/search/?searchtype=author&query=Furletova%2C+Y">Yulia Furletova</a>, <a href="/search/?searchtype=author&query=Gamberg%2C+L">Leonard Gamberg</a>, <a href="/search/?searchtype=author&query=Garcia-Montero%2C+O">Oscar Garcia-Montero</a>, <a href="/search/?searchtype=author&query=Gelis%2C+F">Fran莽ois Gelis</a>, <a href="/search/?searchtype=author&query=Guzey%2C+V">Vadim Guzey</a>, <a href="/search/?searchtype=author&query=Hatta%2C+Y">Yoshitaka Hatta</a>, <a href="/search/?searchtype=author&query=Hautmann%2C+F">Francesco Hautmann</a> , et al. (65 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="2002.12333v2-abstract-short" style="display: inline;"> This volume is a collection of contributions for the 7-week program "Probing Nucleons and Nuclei in High Energy Collisions" that was held at the Institute for Nuclear Theory in Seattle, WA, USA, from October 1 until November 16, 2018. The program was dedicated to the physics of the Electron Ion Collider (EIC), the world's first polarized electron-nucleon (ep) and electron-nucleus (eA) collider to… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.12333v2-abstract-full').style.display = 'inline'; document.getElementById('2002.12333v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2002.12333v2-abstract-full" style="display: none;"> This volume is a collection of contributions for the 7-week program "Probing Nucleons and Nuclei in High Energy Collisions" that was held at the Institute for Nuclear Theory in Seattle, WA, USA, from October 1 until November 16, 2018. The program was dedicated to the physics of the Electron Ion Collider (EIC), the world's first polarized electron-nucleon (ep) and electron-nucleus (eA) collider to be constructed in the USA. These proceedings are organized by chapters, corresponding to the weeks of the program: Week I, Generalized parton distributions; Week II, Transverse spin and TMDs; Week III, Longitudinal spin; Week IV, Symposium week; Weeks V & VI, eA collisions; Week VII, pA and AA collisions. We hope these proceedings will be useful to readers as a compilation of EIC-related science at the end of the second decade of the XXI century. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.12333v2-abstract-full').style.display = 'none'; document.getElementById('2002.12333v2-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 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 February, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Electron Ion Collider, INT 18-3 Program. Published by World Scientific. Duplicates content of arXiv:1912.10965, arXiv:1912.10724, arXiv:1910.03006, arXiv:1910.07982, arXiv:1912.13397, arXiv:1910.01979, arXiv:2001.07862, arXiv:2001.03700, arXiv:1910.01030, arXiv:1910.01273, arXiv:1912.13020, arXiv:1910.06003, arXiv:2001.03655, arXiv:1909.12591, arXiv:1909.09809, arXiv:1910.04806, arXiv:2001.05978</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1912.07550">arXiv:1912.07550</a> <span> [<a href="https://arxiv.org/pdf/1912.07550">pdf</a>, <a href="https://arxiv.org/format/1912.07550">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> </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/10.1007/JHEP07(2020)117">10.1007/JHEP07(2020)117 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Transverse-momentum-dependent parton distributions up to N$^3$LL from Drell-Yan data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Bertone%2C+V">Valerio Bertone</a>, <a href="/search/?searchtype=author&query=Bissolotti%2C+C">Chiara Bissolotti</a>, <a href="/search/?searchtype=author&query=Bozzi%2C+G">Giuseppe Bozzi</a>, <a href="/search/?searchtype=author&query=Delcarro%2C+F">Filippo Delcarro</a>, <a href="/search/?searchtype=author&query=Piacenza%2C+F">Fulvio Piacenza</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</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="1912.07550v3-abstract-short" style="display: inline;"> We present an extraction of unpolarised Transverse-Momentum-Dependent Parton Distribution Functions based on Drell-Yan production data from different experiments, including those at the LHC, and spanning a wide kinematic range. We deal with experimental uncertainties by properly taking into account correlations. We include resummation of logarithms of the transverse momentum of the vector boson up… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1912.07550v3-abstract-full').style.display = 'inline'; document.getElementById('1912.07550v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1912.07550v3-abstract-full" style="display: none;"> We present an extraction of unpolarised Transverse-Momentum-Dependent Parton Distribution Functions based on Drell-Yan production data from different experiments, including those at the LHC, and spanning a wide kinematic range. We deal with experimental uncertainties by properly taking into account correlations. We include resummation of logarithms of the transverse momentum of the vector boson up to N$^3$LL order, and we include non-perturbative contributions. These ingredients allow us to obtain a remarkable agreement with the data. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1912.07550v3-abstract-full').style.display = 'none'; document.getElementById('1912.07550v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 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">Latest version: added panels in Fig. 4, added chi2 values in Fig. 8, changes in App. C, extended discussion on comparison with ATLAS data (Sec. 4.1), footnote 5 added, other small changes in the text</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-THY-19-3121 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1907.06960">arXiv:1907.06960</a> <span> [<a href="https://arxiv.org/pdf/1907.06960">pdf</a>, <a href="https://arxiv.org/format/1907.06960">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.100.054039">10.1103/PhysRevD.100.054039 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Revisiting model relations between T-odd transverse-momentum dependent parton distributions and generalized parton distributions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Pasquini%2C+B">B. Pasquini</a>, <a href="/search/?searchtype=author&query=Rodini%2C+S">S. Rodini</a>, <a href="/search/?searchtype=author&query=Bacchetta%2C+A">A. Bacchetta</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1907.06960v2-abstract-short" style="display: inline;"> We revisit the connection between generalized parton distributions in impact parameter space and T-odd effects in single spin asymmetries of the semi-inclusive deep inelastic process. We show that nontrivial relations can be established only under very specific conditions, typically realized only in models that describe hadrons as two-body bound systems and involving a helicity-conserving coupling… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.06960v2-abstract-full').style.display = 'inline'; document.getElementById('1907.06960v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1907.06960v2-abstract-full" style="display: none;"> We revisit the connection between generalized parton distributions in impact parameter space and T-odd effects in single spin asymmetries of the semi-inclusive deep inelastic process. We show that nontrivial relations can be established only under very specific conditions, typically realized only in models that describe hadrons as two-body bound systems and involving a helicity-conserving coupling between the gauge boson and the spectator system. Examples of these models are the the scalar-diquark spectator model or the quark-target model for the nucleon, and relativistic models for the pion at the lowest order in the Fock-space expansion. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.06960v2-abstract-full').style.display = 'none'; document.getElementById('1907.06960v2-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, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 July, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, 2 figures, 1 table, v2: list of references has been corrected</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 100, 054039 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1906.07037">arXiv:1906.07037</a> <span> [<a href="https://arxiv.org/pdf/1906.07037">pdf</a>, <a href="https://arxiv.org/format/1906.07037">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> </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.2019.134850">10.1016/j.physletb.2019.134850 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Azimuthal asymmetries in unpolarized SIDIS and Drell-Yan processes: a case study towards TMD factorization at subleading twist </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Bozzi%2C+G">Giuseppe Bozzi</a>, <a href="/search/?searchtype=author&query=Echevarria%2C+M+G">Miguel G. Echevarria</a>, <a href="/search/?searchtype=author&query=Pisano%2C+C">Cristian Pisano</a>, <a href="/search/?searchtype=author&query=Prokudin%2C+A">Alexey Prokudin</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</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="1906.07037v1-abstract-short" style="display: inline;"> We consider the azimuthal distribution of the final observed hadron in semi-inclusive deep-inelastic scattering and the lepton pair in the Drell-Yan process. In particular, we focus on the $\cos 蠁$ modulation of the unpolarized cross section and on its dependence upon transverse momentum. At low transverse momentum, for these observables we propose a factorized expression based on tree-level appro… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1906.07037v1-abstract-full').style.display = 'inline'; document.getElementById('1906.07037v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1906.07037v1-abstract-full" style="display: none;"> We consider the azimuthal distribution of the final observed hadron in semi-inclusive deep-inelastic scattering and the lepton pair in the Drell-Yan process. In particular, we focus on the $\cos 蠁$ modulation of the unpolarized cross section and on its dependence upon transverse momentum. At low transverse momentum, for these observables we propose a factorized expression based on tree-level approach and conjecture that the same formula is valid in transverse-momentum dependent (TMD) factorization when written in terms of subtracted TMD parton distributions. Our formula correctly matches with the collinear factorization results at high transverse momentum, solves a long-standing problem and is a necessary step towards the extension of the TMD factorization theorems up to the subleading twist. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1906.07037v1-abstract-full').style.display = 'none'; document.getElementById('1906.07037v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 June, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-THY-19-2963 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1901.08002">arXiv:1901.08002</a> <span> [<a href="https://arxiv.org/pdf/1901.08002">pdf</a>, <a href="https://arxiv.org/format/1901.08002">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> <p class="title is-5 mathjax"> The LHCSpin Project </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Aidala%2C+C+A">C. A. Aidala</a>, <a href="/search/?searchtype=author&query=Bacchetta%2C+A">A. Bacchetta</a>, <a href="/search/?searchtype=author&query=Boglione%2C+M">M. Boglione</a>, <a href="/search/?searchtype=author&query=Bozzi%2C+G">G. Bozzi</a>, <a href="/search/?searchtype=author&query=Carassiti%2C+V">V. Carassiti</a>, <a href="/search/?searchtype=author&query=Chiosso%2C+M">M. Chiosso</a>, <a href="/search/?searchtype=author&query=Cimino%2C+R">R. Cimino</a>, <a href="/search/?searchtype=author&query=Ciullo%2C+G">G. Ciullo</a>, <a href="/search/?searchtype=author&query=Contalbrigo%2C+M">M. Contalbrigo</a>, <a href="/search/?searchtype=author&query=D%27Alesio%2C+U">U. D'Alesio</a>, <a href="/search/?searchtype=author&query=Di+Nezza%2C+P">P. Di Nezza</a>, <a href="/search/?searchtype=author&query=Engels%2C+R">R. Engels</a>, <a href="/search/?searchtype=author&query=Grigoryev%2C+K">K. Grigoryev</a>, <a href="/search/?searchtype=author&query=Keller%2C+D">D. Keller</a>, <a href="/search/?searchtype=author&query=Lenisa%2C+P">P. Lenisa</a>, <a href="/search/?searchtype=author&query=Liuti%2C+S">S. Liuti</a>, <a href="/search/?searchtype=author&query=Metz%2C+A">A. Metz</a>, <a href="/search/?searchtype=author&query=Mulders%2C+P+J">P. J. Mulders</a>, <a href="/search/?searchtype=author&query=Murgia%2C+F">F. Murgia</a>, <a href="/search/?searchtype=author&query=Nass%2C+A">A. Nass</a>, <a href="/search/?searchtype=author&query=Panzieri%2C+D">D. Panzieri</a>, <a href="/search/?searchtype=author&query=Pappalardo%2C+L+L">L. L. Pappalardo</a>, <a href="/search/?searchtype=author&query=Pasquini%2C+B">B. Pasquini</a>, <a href="/search/?searchtype=author&query=Pisano%2C+C">C. Pisano</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">M. Radici</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="1901.08002v1-abstract-short" style="display: inline;"> LHCSpin aims at installing a polarized gas target in front of the LHCb spectrometer, bringing, for the first time, polarized physics to the LHC. The project will benefit from the experience achieved with the installation of an unpolarized gas target at LHCb during the LHC Long Shutdown 2. LHCb will then become the first experiment simultaneously running in collider and fixed-target mode with polar… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.08002v1-abstract-full').style.display = 'inline'; document.getElementById('1901.08002v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1901.08002v1-abstract-full" style="display: none;"> LHCSpin aims at installing a polarized gas target in front of the LHCb spectrometer, bringing, for the first time, polarized physics to the LHC. The project will benefit from the experience achieved with the installation of an unpolarized gas target at LHCb during the LHC Long Shutdown 2. LHCb will then become the first experiment simultaneously running in collider and fixed-target mode with polarized targets, opening a whole new range of explorations to its exceptional spectrometer. LHCSpin will offer a unique opportunity to probe polarized quark and gluon parton distributions in nucleons and nuclei, especially at high $x$ and intermediate $Q^2$, where experimental data are still largely missing. Beside standard collinear parton distribution functions (PDFs), LHCSpin will make it possible to study multidimensional polarized parton distributions that depend also on parton transverse momentum. The study of the multidimensional partonic structure of the nucleon, particularly including polarization effects, can test our knowledge of QCD at an unprecedented level of sophistication, both in the perturbative and nonperturbative regime. At the same time, an accurate knowledge of hadron structure is necessary for precision measurements of Standard Model (SM) observables and discovery of physics beyond the SM. Due to the intricate nature of the strong interaction, it is indispensable to perform the widest possible suite of experimental measurements. It will be ideal to have two new projects complementing each other: a new facility for polarized electron-proton collisions and a new facility for polarized proton-proton collisions. LHCSpin stands out at the moment as the most promising candidate for the second type of project, going beyond the kinematic coverage and the accuracy of the existent experiments, especially on the heavy-quark sector. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.08002v1-abstract-full').style.display = 'none'; document.getElementById('1901.08002v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1901.06916">arXiv:1901.06916</a> <span> [<a href="https://arxiv.org/pdf/1901.06916">pdf</a>, <a href="https://arxiv.org/format/1901.06916">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/PhysRevD.100.014018">10.1103/PhysRevD.100.014018 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Difficulties in the description of Drell-Yan processes at moderate invariant mass and high transverse momentum </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Bozzi%2C+G">Giuseppe Bozzi</a>, <a href="/search/?searchtype=author&query=Lambertsen%2C+M">Martin Lambertsen</a>, <a href="/search/?searchtype=author&query=Piacenza%2C+F">Fulvio Piacenza</a>, <a href="/search/?searchtype=author&query=Steiglechner%2C+J">Julius Steiglechner</a>, <a href="/search/?searchtype=author&query=Vogelsang%2C+W">Werner Vogelsang</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="1901.06916v1-abstract-short" style="display: inline;"> We study the Drell-Yan cross section differential with respect to the transverse momentum of the produced lepton pair. We consider data with moderate invariant mass Q of the lepton pair, between 4.5 GeV and 13.5 GeV, and similar (although slightly smaller) values of the transverse momentum q_T. We approach the problem by deriving predictions based on standard collinear factorization, which are exp… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.06916v1-abstract-full').style.display = 'inline'; document.getElementById('1901.06916v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1901.06916v1-abstract-full" style="display: none;"> We study the Drell-Yan cross section differential with respect to the transverse momentum of the produced lepton pair. We consider data with moderate invariant mass Q of the lepton pair, between 4.5 GeV and 13.5 GeV, and similar (although slightly smaller) values of the transverse momentum q_T. We approach the problem by deriving predictions based on standard collinear factorization, which are expected to be valid toward the high-q_T end of the spectrum and to which any description of the spectrum at lower q_T using transverse-momentum dependent parton distributions ultimately needs to be matched. We find that the collinear framework predicts cross sections that in most cases are significantly below available data at high q_T. We discuss additional perturbative and possible non-perturbative effects that increase the predicted cross section, but not by a sufficient amount. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.06916v1-abstract-full').style.display = 'none'; document.getElementById('1901.06916v1-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 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> INT-PUB-19-002 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 100, 014018 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1810.02297">arXiv:1810.02297</a> <span> [<a href="https://arxiv.org/pdf/1810.02297">pdf</a>, <a href="https://arxiv.org/ps/1810.02297">ps</a>, <a href="https://arxiv.org/format/1810.02297">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 - Theory">hep-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2018.11.019">10.1016/j.physletb.2018.11.019 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> QCD$\times$QED evolution of TMDs </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Echevarria%2C+M+G">Miguel G. Echevarria</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="1810.02297v2-abstract-short" style="display: inline;"> We consider for the first time the QED corrections to the evolution of (un)polarized quark and gluon transverse-momentum-dependent distribution and fragmentation functions (TMDs in general). By extending their operator definition to QCD$\times$QED, we provide the mixed new anomalous dimensions up to ${\cal O}(伪_s伪)$ and the pure QED ones up to ${\cal O}(伪^2)$. These new corrections are universal f… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.02297v2-abstract-full').style.display = 'inline'; document.getElementById('1810.02297v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1810.02297v2-abstract-full" style="display: none;"> We consider for the first time the QED corrections to the evolution of (un)polarized quark and gluon transverse-momentum-dependent distribution and fragmentation functions (TMDs in general). By extending their operator definition to QCD$\times$QED, we provide the mixed new anomalous dimensions up to ${\cal O}(伪_s伪)$ and the pure QED ones up to ${\cal O}(伪^2)$. These new corrections are universal for all TMDs up to the flavor of the considered parton, i.e., the full flavor universality of TMD evolution found in pure QCD is broken in QCD$\times$QED by the presence of the electric charge. In addition, we provide the leading-order QED corrections to the matching coefficients of the unpolarized quark TMD parton distribution function onto its integrated counterparts at ${\cal O}(伪_s^0伪)$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.02297v2-abstract-full').style.display = 'none'; document.getElementById('1810.02297v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 November, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 October, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">9 pages, 3 figures. v2: minor corrections, accepted for publication in Phys. Lett. B</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1809.02056">arXiv:1809.02056</a> <span> [<a href="https://arxiv.org/pdf/1809.02056">pdf</a>, <a href="https://arxiv.org/format/1809.02056">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> </div> </div> <p class="title is-5 mathjax"> Gluon TMDs and NRQCD matrix elements in $J/蠄$ production at an EIC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Boer%2C+D">Dani毛l Boer</a>, <a href="/search/?searchtype=author&query=Pisano%2C+C">Cristian Pisano</a>, <a href="/search/?searchtype=author&query=Taels%2C+P">Pieter Taels</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1809.02056v2-abstract-short" style="display: inline;"> In this paper we analyze azimuthal asymmetries in the processes of unpolarized and polarized $J/蠄\,(违)$ production at an Electron-Ion Collider. Apart from giving access to various unknown gluon transverse momentum distributions, we suggest to use them as a new method to extract specific color-octet NRQCD long-distance matrix elements, i.e.\ $\langle0|{\cal O}_{8}^{J/蠄}(^{1}S_{0})|0\rangle$ and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.02056v2-abstract-full').style.display = 'inline'; document.getElementById('1809.02056v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1809.02056v2-abstract-full" style="display: none;"> In this paper we analyze azimuthal asymmetries in the processes of unpolarized and polarized $J/蠄\,(违)$ production at an Electron-Ion Collider. Apart from giving access to various unknown gluon transverse momentum distributions, we suggest to use them as a new method to extract specific color-octet NRQCD long-distance matrix elements, i.e.\ $\langle0|{\cal O}_{8}^{J/蠄}(^{1}S_{0})|0\rangle$ and $\langle0|{\cal O}_{8}^{J/蠄}(^{3}P_{0})|0\rangle$, whose values are still quite uncertain and for which lattice calculations are unavailable. The new method is based on combining measurements of analogous asymmetries in open heavy-quark pair production which can be performed at the same energy. To enhance the gluon contribution one can consider smaller values of $x$ and, in order to assess the impact of small-$x$ evolution, we perform a numerical study using the MV model as a starting input and evolve it with the JIMWLK equations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.02056v2-abstract-full').style.display = 'none'; document.getElementById('1809.02056v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 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">22 pages, 10 figures; v2: new section and figure added, references updated, conclusions unchanged</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1807.02101">arXiv:1807.02101</a> <span> [<a href="https://arxiv.org/pdf/1807.02101">pdf</a>, <a href="https://arxiv.org/format/1807.02101">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2018.11.002">10.1016/j.physletb.2018.11.002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Effect of flavor-dependent partonic transverse momentum on the determination of the $W$ boson mass in hadronic collisions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Bozzi%2C+G">Giuseppe Bozzi</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</a>, <a href="/search/?searchtype=author&query=Ritzmann%2C+M">Mathias Ritzmann</a>, <a href="/search/?searchtype=author&query=Signori%2C+A">Andrea Signori</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="1807.02101v2-abstract-short" style="display: inline;"> Within the framework of transverse-momentum-dependent factorization, we investigate for the first time the impact of a flavor-dependent intrinsic transverse momentum of quarks on the production of $W^{\pm}$ bosons in proton-proton collisions at $\sqrt{s}$ = 7 TeV. We estimate the shift in the extracted value of the $W$ boson mass $M_W$ induced by different choices of flavor-dependent parameters fo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1807.02101v2-abstract-full').style.display = 'inline'; document.getElementById('1807.02101v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1807.02101v2-abstract-full" style="display: none;"> Within the framework of transverse-momentum-dependent factorization, we investigate for the first time the impact of a flavor-dependent intrinsic transverse momentum of quarks on the production of $W^{\pm}$ bosons in proton-proton collisions at $\sqrt{s}$ = 7 TeV. We estimate the shift in the extracted value of the $W$ boson mass $M_W$ induced by different choices of flavor-dependent parameters for the intrinsic quark transverse momentum by means of a template fit to the transverse-mass and the lepton transverse-momentum distributions of the $W$-decay products. We obtain $-6\leq 螖M_{W^+} \leq 9$ MeV and $-4\leq 螖M_{W^-} \leq 3$ MeV with a statistical uncertainty of $\pm 2.5$ MeV. Our findings call for more detailed investigations of flavor-dependent nonperturbative effects linked to the proton structure at hadron colliders. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1807.02101v2-abstract-full').style.display = 'none'; document.getElementById('1807.02101v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 August, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 July, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 2 tables; revised version with new results with more statistics, more comments, conclusions unchanged, added one reference</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-THY-18-2757, NIKHEF 2018-032 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1802.05212">arXiv:1802.05212</a> <span> [<a href="https://arxiv.org/pdf/1802.05212">pdf</a>, <a href="https://arxiv.org/format/1802.05212">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.120.192001">10.1103/PhysRevLett.120.192001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First Extraction of Transversity from a Global Analysis of Electron-Proton and Proton-Proton Data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</a>, <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1802.05212v2-abstract-short" style="display: inline;"> We present the first extraction of the transversity distribution in the framework of collinear factorization based on the global analysis of pion-pair production in deep-inelastic scattering off transversely polarized targets and in proton-proton collisions with one transversely polarized proton. The extraction relies on the knowledge of di-hadron fragmentation functions, which are taken from the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.05212v2-abstract-full').style.display = 'inline'; document.getElementById('1802.05212v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1802.05212v2-abstract-full" style="display: none;"> We present the first extraction of the transversity distribution in the framework of collinear factorization based on the global analysis of pion-pair production in deep-inelastic scattering off transversely polarized targets and in proton-proton collisions with one transversely polarized proton. The extraction relies on the knowledge of di-hadron fragmentation functions, which are taken from the analysis of electron-positron annihilation data. For the first time, the chiral-odd transversity is extracted from a global analysis similar to what is usually done for the chiral-even spin-averaged and helicity distributions. The knowledge of transversity is important for, among other things, detecting possible signals of new physics in high-precision low-energy experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.05212v2-abstract-full').style.display = 'none'; document.getElementById('1802.05212v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 May, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 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">version identical to published one; supplemental material available at http://link.aps.org/supplemental/10.1103/PhysRevLett.120.192001</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 120, 192001 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1802.01578">arXiv:1802.01578</a> <span> [<a href="https://arxiv.org/pdf/1802.01578">pdf</a>, <a href="https://arxiv.org/format/1802.01578">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.97.074019">10.1103/PhysRevD.97.074019 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Semi-inclusive production of two back-to-back hadron pairs in $e^+e^-$ annihilation revisited </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Matevosyan%2C+H+H">Hrayr H. Matevosyan</a>, <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Boer%2C+D">Dani毛l Boer</a>, <a href="/search/?searchtype=author&query=Courtoy%2C+A">Aurore Courtoy</a>, <a href="/search/?searchtype=author&query=Kotzinian%2C+A">Aram Kotzinian</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</a>, <a href="/search/?searchtype=author&query=Thomas%2C+A+W">Anthony W. Thomas</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1802.01578v2-abstract-short" style="display: inline;"> The cross section for back-to-back hadron pair production in $e^+e^-$ annihilation provides access to the dihadron fragmentation functions (DiFF) needed to extract nucleon parton distribution functions from the semi-inclusive deep inelastic scattering (SIDIS) experiments with two detected final state hadrons. Particular attention is given to the so-called interference DiFF (IFF), which makes it po… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.01578v2-abstract-full').style.display = 'inline'; document.getElementById('1802.01578v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1802.01578v2-abstract-full" style="display: none;"> The cross section for back-to-back hadron pair production in $e^+e^-$ annihilation provides access to the dihadron fragmentation functions (DiFF) needed to extract nucleon parton distribution functions from the semi-inclusive deep inelastic scattering (SIDIS) experiments with two detected final state hadrons. Particular attention is given to the so-called interference DiFF (IFF), which makes it possible to extract the transversity parton distribution of the nucleon in the collinear framework. However, previously unnoticed discrepancies were recently highlighted between the definitions of the IFFs appearing in the collinear kinematics when reconstructed from DiFFs entering the unintegrated fully differential cross sections of SIDIS and $e^+e^-$ annihilation processes. In this work, to clarify this problem we rederive the fully differential cross section for $e^+e^-$ annihilation at the leading-twist approximation. We find a mistake in the definition of the kinematics in the original expression that systematically affects a subset of terms and that leads to two significant consequences. First, the discrepancy between the IFF definitions in the cross sections for SIDIS and $e^+e^-$ annihilation is resolved. Second, the previously derived azimuthal asymmetry for accessing the helicity dependent DiFF $G_1^\perp$ in $e^+e^-$ annihilation vanishes, which explains the nonobservation of this asymmetry in the recent experimental searches by the ${\tt BELLE}$ Collaboration. We discuss the recently proposed alternative option to extract $G_1^\perp$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.01578v2-abstract-full').style.display = 'none'; document.getElementById('1802.01578v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 July, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 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">15 pages, 2 figures. V2: Updated to version published in PRD with minor revisions of the text</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> ADP-17-30/T1036 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 97, 074019 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1801.08443">arXiv:1801.08443</a> <span> [<a href="https://arxiv.org/pdf/1801.08443">pdf</a>, <a href="https://arxiv.org/format/1801.08443">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> </div> </div> <p class="title is-5 mathjax"> A first determination of the unpolarized quark TMDs from a global analysis </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Pisano%2C+C">Cristian Pisano</a>, <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Delcarro%2C+F">Filippo Delcarro</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</a>, <a href="/search/?searchtype=author&query=Signori%2C+A">Andrea Signori</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="1801.08443v1-abstract-short" style="display: inline;"> Transverse momentum dependent distribution and fragmentation functions of unpolarized quarks inside unpolarized protons are extracted, for the first time, through a simultaneous analysis of semi-inclusive deep-inelastic scattering, Drell-Yan and $Z$ boson hadroproduction processes. This study is performed at leading order in perturbative QCD, with energy scale evolution at the next-to-leading loga… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1801.08443v1-abstract-full').style.display = 'inline'; document.getElementById('1801.08443v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1801.08443v1-abstract-full" style="display: none;"> Transverse momentum dependent distribution and fragmentation functions of unpolarized quarks inside unpolarized protons are extracted, for the first time, through a simultaneous analysis of semi-inclusive deep-inelastic scattering, Drell-Yan and $Z$ boson hadroproduction processes. This study is performed at leading order in perturbative QCD, with energy scale evolution at the next-to-leading logarithmic accuracy. Moreover, some specific choices are made to deal with low scale evolution around 1 GeV$^2$. Since only data in the low transverse momentum region are considered, no matching to fixed-order calculations at high transverse momentum is needed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1801.08443v1-abstract-full').style.display = 'none'; document.getElementById('1801.08443v1-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, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 6 figures, 1 table; to appear in the Proceedings of the QCD Evolution 2017 Workshop, Newport News, Virginia (USA), 22 - 26 May 2017</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-THY-18-2628 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1711.07916">arXiv:1711.07916</a> <span> [<a href="https://arxiv.org/pdf/1711.07916">pdf</a>, <a href="https://arxiv.org/format/1711.07916">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> </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.ppnp.2018.01.007">10.1016/j.ppnp.2018.01.007 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Parton distributions and lattice QCD calculations: a community white paper </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Lin%2C+H">Huey-Wen Lin</a>, <a href="/search/?searchtype=author&query=Nocera%2C+E+R">Emanuele R. Nocera</a>, <a href="/search/?searchtype=author&query=Olness%2C+F">Fred Olness</a>, <a href="/search/?searchtype=author&query=Orginos%2C+K">Kostas Orginos</a>, <a href="/search/?searchtype=author&query=Rojo%2C+J">Juan Rojo</a>, <a href="/search/?searchtype=author&query=Accardi%2C+A">Alberto Accardi</a>, <a href="/search/?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Bozzi%2C+G">Giuseppe Bozzi</a>, <a href="/search/?searchtype=author&query=Chen%2C+J">Jiunn-Wei Chen</a>, <a href="/search/?searchtype=author&query=Collins%2C+S">Sara Collins</a>, <a href="/search/?searchtype=author&query=Cooper-Sarkar%2C+A">Amanda Cooper-Sarkar</a>, <a href="/search/?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/?searchtype=author&query=Del+Debbio%2C+L">Luigi Del Debbio</a>, <a href="/search/?searchtype=author&query=Engelhardt%2C+M">Michael Engelhardt</a>, <a href="/search/?searchtype=author&query=Green%2C+J">Jeremy Green</a>, <a href="/search/?searchtype=author&query=Gupta%2C+R">Rajan Gupta</a>, <a href="/search/?searchtype=author&query=Harland-Lang%2C+L+A">Lucian A. Harland-Lang</a>, <a href="/search/?searchtype=author&query=Ishikawa%2C+T">Tomomi Ishikawa</a>, <a href="/search/?searchtype=author&query=Kusina%2C+A">Aleksander Kusina</a>, <a href="/search/?searchtype=author&query=Liu%2C+K">Keh-Fei Liu</a>, <a href="/search/?searchtype=author&query=Liuti%2C+S">Simonetta Liuti</a>, <a href="/search/?searchtype=author&query=Monahan%2C+C">Christopher Monahan</a>, <a href="/search/?searchtype=author&query=Nadolsky%2C+P">Pavel Nadolsky</a>, <a href="/search/?searchtype=author&query=Qiu%2C+J">Jian-Wei Qiu</a> , et al. (7 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1711.07916v3-abstract-short" style="display: inline;"> In the framework of quantum chromodynamics (QCD), parton distribution functions (PDFs) quantify how the momentum and spin of a hadron are divided among its quark and gluon constituents. Two main approaches exist to determine PDFs. The first approach, based on QCD factorization theorems, realizes a QCD analysis of a suitable set of hard-scattering measurements, often using a variety of hadronic obs… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.07916v3-abstract-full').style.display = 'inline'; document.getElementById('1711.07916v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.07916v3-abstract-full" style="display: none;"> In the framework of quantum chromodynamics (QCD), parton distribution functions (PDFs) quantify how the momentum and spin of a hadron are divided among its quark and gluon constituents. Two main approaches exist to determine PDFs. The first approach, based on QCD factorization theorems, realizes a QCD analysis of a suitable set of hard-scattering measurements, often using a variety of hadronic observables. The second approach, based on first-principle operator definitions of PDFs, uses lattice QCD to compute directly some PDF-related quantities, such as their moments. Motivated by recent progress in both approaches, in this document we present an overview of lattice-QCD and global-analysis techniques used to determine unpolarized and polarized proton PDFs and their moments. We provide benchmark numbers to validate present and future lattice-QCD calculations and we illustrate how they could be used to reduce the PDF uncertainties in current unpolarized and polarized global analyses. This document represents a first step towards establishing a common language between the two communities, to foster dialogue and to further improve our knowledge of PDFs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.07916v3-abstract-full').style.display = 'none'; document.getElementById('1711.07916v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">80 pages, 15 figures, 28 tables, minor typos corrected, published in Progress in Particle and Nuclear Physics</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> DESY 17-185, IFJPAN-IV-2017-19, INT-PUB-17-042, MSUHEP-17-017, Nikhef-2017-047, OUTP-17-15P, SMU-HEP-17-08 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1709.03324">arXiv:1709.03324</a> <span> [<a href="https://arxiv.org/pdf/1709.03324">pdf</a>, <a href="https://arxiv.org/format/1709.03324">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> </div> </div> <p class="title is-5 mathjax"> Extraction of partonic transverse momentum distributions from semi-inclusive deep inelastic scattering and Drell-Yan data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Pisano%2C+C">Cristian Pisano</a>, <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Delcarro%2C+F">Filippo Delcarro</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</a>, <a href="/search/?searchtype=author&query=Signori%2C+A">Andrea Signori</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="1709.03324v1-abstract-short" style="display: inline;"> We present a first attempt at a global fit of unpolarized quark transverse momentum dependent distribution and fragmentation functions from available data on semi-inclusive deep-inelastic scattering, Drell-Yan and $Z$ boson production processes. This analysis is performed in the low transverse momentum region, at leading order in perturbative QCD and with the inclusion of energy scale evolution ef… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1709.03324v1-abstract-full').style.display = 'inline'; document.getElementById('1709.03324v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1709.03324v1-abstract-full" style="display: none;"> We present a first attempt at a global fit of unpolarized quark transverse momentum dependent distribution and fragmentation functions from available data on semi-inclusive deep-inelastic scattering, Drell-Yan and $Z$ boson production processes. This analysis is performed in the low transverse momentum region, at leading order in perturbative QCD and with the inclusion of energy scale evolution effects at the next-to-leading logarithmic accuracy. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1709.03324v1-abstract-full').style.display = 'none'; document.getElementById('1709.03324v1-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 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">6 pages, 4 figures, to appear in the Proceedings of the XXV International Workshop on Deep Inelastic Scattering and Related Topics (DIS 2017), Birmingham (UK), 3-7 April 2017</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1706.02000">arXiv:1706.02000</a> <span> [<a href="https://arxiv.org/pdf/1706.02000">pdf</a>, <a href="https://arxiv.org/format/1706.02000">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.2017.08.074">10.1016/j.physletb.2017.08.074 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Accessing the nucleon transverse structure in inclusive deep inelastic scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Accardi%2C+A">Alberto Accardi</a>, <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1706.02000v2-abstract-short" style="display: inline;"> We revisit the standard analysis of inclusive Deep Inelastic Scattering off nucleons taking into account the fact that on-shell quarks cannot be present in the final state, but they rather decay into hadrons - a process that can be described in terms of suitable "jet" correlators. As a consequence, a spin-flip term associated with the invariant mass of the produced hadrons is generated non perturb… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.02000v2-abstract-full').style.display = 'inline'; document.getElementById('1706.02000v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1706.02000v2-abstract-full" style="display: none;"> We revisit the standard analysis of inclusive Deep Inelastic Scattering off nucleons taking into account the fact that on-shell quarks cannot be present in the final state, but they rather decay into hadrons - a process that can be described in terms of suitable "jet" correlators. As a consequence, a spin-flip term associated with the invariant mass of the produced hadrons is generated non perturbatively and couples to the target's transversity distribution function. In inclusive cross sections, this provides an hitherto neglected and large contribution to the twist-3 part of the g2 structure function, that can explain the discrepancy between recent calculations and fits of this quantity. It also provides an extension of the Burkhardt-Cottingham sum rule, putting constraints on the small-x behavior of the transversity function, as well as an extension of the Efremov-Teryaev-Leader sum rule, suggesting a novel way to measure the tensor charge of the proton. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.02000v2-abstract-full').style.display = 'none'; document.getElementById('1706.02000v2-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 September, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 June, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 3 figures. Extended discussion on small-x transversity asymptotics. References added</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-THY-17-2483 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1703.10157">arXiv:1703.10157</a> <span> [<a href="https://arxiv.org/pdf/1703.10157">pdf</a>, <a href="https://arxiv.org/format/1703.10157">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> </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/10.1007/JHEP06(2017)081">10.1007/JHEP06(2017)081 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Extraction of partonic transverse momentum distributions from semi-inclusive deep-inelastic scattering, Drell-Yan and Z-boson production </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Delcarro%2C+F">Filippo Delcarro</a>, <a href="/search/?searchtype=author&query=Pisano%2C+C">Cristian Pisano</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</a>, <a href="/search/?searchtype=author&query=Signori%2C+A">Andrea Signori</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="1703.10157v1-abstract-short" style="display: inline;"> We present an extraction of unpolarized partonic transverse momentum distributions (TMDs) from a simultaneous fit of available data measured in semi-inclusive deep-inelastic scattering, Drell-Yan and Z-boson production. To connect data at different scales, we use TMD evolution at next-to-leading logarithmic accuracy. The analysis is restricted to the low-transverse-momentum region, with no matchin… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.10157v1-abstract-full').style.display = 'inline'; document.getElementById('1703.10157v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1703.10157v1-abstract-full" style="display: none;"> We present an extraction of unpolarized partonic transverse momentum distributions (TMDs) from a simultaneous fit of available data measured in semi-inclusive deep-inelastic scattering, Drell-Yan and Z-boson production. To connect data at different scales, we use TMD evolution at next-to-leading logarithmic accuracy. The analysis is restricted to the low-transverse-momentum region, with no matching to fixed-order calculations at high transverse momentum. We introduce specific choices to deal with TMD evolution at low scales, of the order of 1 GeV$^2$. This could be considered as a first attempt at a global fit of TMDs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.10157v1-abstract-full').style.display = 'none'; document.getElementById('1703.10157v1-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 March, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB THY 17-2437 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1703.07669">arXiv:1703.07669</a> <span> [<a href="https://arxiv.org/pdf/1703.07669">pdf</a>, <a href="https://arxiv.org/format/1703.07669">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> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2017.05.072">10.1016/j.physletb.2017.05.072 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The transverse structure of the pion in momentum space inspired by the AdS/QCD correspondence </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Cotogno%2C+S">Sabrina Cotogno</a>, <a href="/search/?searchtype=author&query=Pasquini%2C+B">Barbara Pasquini</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="1703.07669v1-abstract-short" style="display: inline;"> We study the internal structure of the pion using a model inspired by the AdS/QCD correspondence. The holographic approach provides the light-front wave function (LFWF) for the leading Fock state component of the pion. We adopt two different forms for the LFWF derived from the AdS/QCD soft-wall model, with free parameters fitted to the available experimental information on the pion electromagnetic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.07669v1-abstract-full').style.display = 'inline'; document.getElementById('1703.07669v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1703.07669v1-abstract-full" style="display: none;"> We study the internal structure of the pion using a model inspired by the AdS/QCD correspondence. The holographic approach provides the light-front wave function (LFWF) for the leading Fock state component of the pion. We adopt two different forms for the LFWF derived from the AdS/QCD soft-wall model, with free parameters fitted to the available experimental information on the pion electromagnetic form factor and the leading-twist parton distribution function. The intrinsic scale of the model is taken as an additional fit parameter. Within this framework, we provide predictions for the unpolarized transverse momentum dependent parton distribution (TMD), and discuss its property both at the scale of the model and after TMD evolution to higher scales that are relevant for upcoming experimental measurements. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.07669v1-abstract-full').style.display = 'none'; document.getElementById('1703.07669v1-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 March, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 6 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1609.00746">arXiv:1609.00746</a> <span> [<a href="https://arxiv.org/pdf/1609.00746">pdf</a>, <a href="https://arxiv.org/format/1609.00746">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.94.116005">10.1103/PhysRevD.94.116005 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Revisiting the equivalence of light-front and covariant QED in the light-cone gauge </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Mantovani%2C+L">Luca Mantovani</a>, <a href="/search/?searchtype=author&query=Pasquini%2C+B">Barbara Pasquini</a>, <a href="/search/?searchtype=author&query=Xiong%2C+X">Xiaonu Xiong</a>, <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</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="1609.00746v1-abstract-short" style="display: inline;"> We discuss the equivalence between light-front time-ordered-perturbation theory and covariant quantum field theory in light-front quantization, in the case of quantum electrodynamics at one-loop level. In particular, we review the one-loop calculation of the vertex correction, fermion self-energy and vacuum polarization. We apply the procedure of integration by residue over the light-front energy… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.00746v1-abstract-full').style.display = 'inline'; document.getElementById('1609.00746v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1609.00746v1-abstract-full" style="display: none;"> We discuss the equivalence between light-front time-ordered-perturbation theory and covariant quantum field theory in light-front quantization, in the case of quantum electrodynamics at one-loop level. In particular, we review the one-loop calculation of the vertex correction, fermion self-energy and vacuum polarization. We apply the procedure of integration by residue over the light-front energy in the loop to show how the perturbative expansion in covariant terms can be reduced to a sum of propagating and instantaneous diagrams of light-front time-ordered perturbation theory. The detailed proof of equivalence between the two formulations of the theory resolves the controversial question on which form should be used for the gauge-field propagator in the light-cone gauge in the covariant approach. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.00746v1-abstract-full').style.display = 'none'; document.getElementById('1609.00746v1-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 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">18 pages, 5 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 94, 116005 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1608.07638">arXiv:1608.07638</a> <span> [<a href="https://arxiv.org/pdf/1608.07638">pdf</a>, <a href="https://arxiv.org/format/1608.07638">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.95.014036">10.1103/PhysRevD.95.014036 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Reconstructing parton densities at large fractional momenta </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</a>, <a href="/search/?searchtype=author&query=Pasquini%2C+B">Barbara Pasquini</a>, <a href="/search/?searchtype=author&query=Xiong%2C+X">Xiaonu Xiong</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1608.07638v1-abstract-short" style="display: inline;"> Parton distribution functions (PDFs) are nonperturbative objects defined by nonlocal light-cone correlations. They cannot be computed directly from Quantum Chromodynamics (QCD). Using a standard lattice QCD approach, it is possible to compute moments of PDFs, which are matrix elements of local operators. Recently, an alternative approach has been proposed, based on the introduction of quasi-parton… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.07638v1-abstract-full').style.display = 'inline'; document.getElementById('1608.07638v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1608.07638v1-abstract-full" style="display: none;"> Parton distribution functions (PDFs) are nonperturbative objects defined by nonlocal light-cone correlations. They cannot be computed directly from Quantum Chromodynamics (QCD). Using a standard lattice QCD approach, it is possible to compute moments of PDFs, which are matrix elements of local operators. Recently, an alternative approach has been proposed, based on the introduction of quasi-parton distribution functions (quasi-PDFs), which are matrix elements of equal-time spatial correlations and hence calculable on lattice. Quasi-PDFs approach standard PDFs in the limit of very large longitudinal proton momenta $P^z$. This limit is not attainable in lattice simulations, and quasi-PDFs fail to reproduce PDFs at high fractional longitudinal momenta. In this paper, we propose a method to improve the reconstruction of PDFs by combining information from quasi-PDFs and from the Mellin moments of regular PDFs. We test our method using the diquark spectator model for up and down valence distributions of both unpolarized and helicity PDFs. In the future, the method can be used to produce PDFs entirely based on lattice QCD results. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.07638v1-abstract-full').style.display = 'none'; document.getElementById('1608.07638v1-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 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">12 pages, 7 double-panel figures in pdf, RevTeX4-1</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, 014036 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1604.06585">arXiv:1604.06585</a> <span> [<a href="https://arxiv.org/pdf/1604.06585">pdf</a>, <a href="https://arxiv.org/format/1604.06585">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.94.034012">10.1103/PhysRevD.94.034012 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Exploring universality of transversity in proton-proton collisions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</a>, <a href="/search/?searchtype=author&query=Ricci%2C+A+M">Alessandro M. Ricci</a>, <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Mukherjee%2C+A">Asmita Mukherjee</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="1604.06585v1-abstract-short" style="display: inline;"> We consider the azimuthal correlations of charged hadron pairs with large total transverse momentum and small relative momentum, produced in proton-proton collisions with one transversely polarized proton. One of these correlations directly probes the chiral-odd transversity parton distribution in connection with a chiral-odd interference fragmentation function. We present predictions for this obs… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1604.06585v1-abstract-full').style.display = 'inline'; document.getElementById('1604.06585v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1604.06585v1-abstract-full" style="display: none;"> We consider the azimuthal correlations of charged hadron pairs with large total transverse momentum and small relative momentum, produced in proton-proton collisions with one transversely polarized proton. One of these correlations directly probes the chiral-odd transversity parton distribution in connection with a chiral-odd interference fragmentation function. We present predictions for this observable based on previous extractions of transversity (from charged pion pair production in semi-inclusive deep-inelastic scattering) and of the interference fragmentation function (from the production of back-to-back charged pion pairs in electron-positron annihilations). All analyses are performed in the framework of collinear factorization. We compare our predictions to the recent data on proton-proton collisions released by the STAR collaboration at RHIC, and we find them reasonably compatible. This comparison confirms for the first time the predicted role of transversity in proton-proton collisions and it allows to test its universality. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1604.06585v1-abstract-full').style.display = 'none'; document.getElementById('1604.06585v1-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 April, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, revtex4-1 with pdflatex, 4 figures in pdf format</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 94, 034012 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1601.01499">arXiv:1601.01499</a> <span> [<a href="https://arxiv.org/pdf/1601.01499">pdf</a>, <a href="https://arxiv.org/format/1601.01499">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> <p class="title is-5 mathjax"> Summary of workshop on Future Physics with HERA Data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">A. Bacchetta</a>, <a href="/search/?searchtype=author&query=Bl%C3%BCmlein%2C+J">J. Bl眉mlein</a>, <a href="/search/?searchtype=author&query=Behnke%2C+O">O. Behnke</a>, <a href="/search/?searchtype=author&query=Dainton%2C+J">J. Dainton</a>, <a href="/search/?searchtype=author&query=Diehl%2C+M">M. Diehl</a>, <a href="/search/?searchtype=author&query=Hautmann%2C+F">F. Hautmann</a>, <a href="/search/?searchtype=author&query=Geiser%2C+A">A. Geiser</a>, <a href="/search/?searchtype=author&query=Jung%2C+H">H. Jung</a>, <a href="/search/?searchtype=author&query=Karshon%2C+U">U. Karshon</a>, <a href="/search/?searchtype=author&query=Kang%2C+D">D. Kang</a>, <a href="/search/?searchtype=author&query=Kroll%2C+P">P. Kroll</a>, <a href="/search/?searchtype=author&query=Lee%2C+C">C. Lee</a>, <a href="/search/?searchtype=author&query=Levonian%2C+S">S. Levonian</a>, <a href="/search/?searchtype=author&query=Levy%2C+A">A. Levy</a>, <a href="/search/?searchtype=author&query=Lohrmann%2C+E">E. Lohrmann</a>, <a href="/search/?searchtype=author&query=Moch%2C+S">S. Moch</a>, <a href="/search/?searchtype=author&query=Motyka%2C+L">L. Motyka</a>, <a href="/search/?searchtype=author&query=McNulty%2C+R">R. McNulty</a>, <a href="/search/?searchtype=author&query=Myronenko%2C+V">V. Myronenko</a>, <a href="/search/?searchtype=author&query=Nocera%2C+E+R">E. R. Nocera</a>, <a href="/search/?searchtype=author&query=Pl%C3%A4tzer%2C+S">S. Pl盲tzer</a>, <a href="/search/?searchtype=author&query=Rostomyan%2C+A">A. Rostomyan</a>, <a href="/search/?searchtype=author&query=Ruspa%2C+M">M. Ruspa</a>, <a href="/search/?searchtype=author&query=Sauter%2C+M">M. Sauter</a>, <a href="/search/?searchtype=author&query=Schnell%2C+G">G. Schnell</a> , et al. (8 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1601.01499v1-abstract-short" style="display: inline;"> Recent highlights from the HERA experiments, Hermes, H1 and ZEUS, are reviewed and ideas for future analyses to fully exploit this unique data set are proposed. This document is a summary of a workshop on future physics with HERA data held at DESY, Hamburg at the end of 2014. All areas of HERA physics are covered and contributions from both experimentalists and theorists are included. The document… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.01499v1-abstract-full').style.display = 'inline'; document.getElementById('1601.01499v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1601.01499v1-abstract-full" style="display: none;"> Recent highlights from the HERA experiments, Hermes, H1 and ZEUS, are reviewed and ideas for future analyses to fully exploit this unique data set are proposed. This document is a summary of a workshop on future physics with HERA data held at DESY, Hamburg at the end of 2014. All areas of HERA physics are covered and contributions from both experimentalists and theorists are included. The document outlines areas where HERA physics can still make a significant contribution, principally in a deeper understanding of QCD, and its relevance to other facilities. Within the framework of the Data Preservation in High Energy Physics, the HERA data have been preserved for analyses to take place over a timescale of 10 years and more. Therefore, although an extensive list of possibilities is presented here, safe storage of the data ensures that it can also be used in the far future should new ideas and analyses be proposed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.01499v1-abstract-full').style.display = 'none'; document.getElementById('1601.01499v1-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 January, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">39 pages, 16 figures, write-up of contributions to HERA workshop, DESY, November 2014</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> DESY-15-253, IPPP/15/76, DCPT/15/152, MAN/HEP/2015/21 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1508.06964">arXiv:1508.06964</a> <span> [<a href="https://arxiv.org/pdf/1508.06964">pdf</a>, <a href="https://arxiv.org/format/1508.06964">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.93.013005">10.1103/PhysRevD.93.013005 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The electron in three-dimensional momentum space </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Mantovani%2C+L">Luca Mantovani</a>, <a href="/search/?searchtype=author&query=Pasquini%2C+B">Barbara Pasquini</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="1508.06964v2-abstract-short" style="display: inline;"> We study the electron as a system composed by an electron and a photon, using lowest order perturbation theory. We derive the leading-twist transverse-momentum-dependent distribution functions for both the electron and photon in the dressed electron, thereby offering a three-dimensional description of the dressed electron in momentum space. To obtain the distribution functions, we apply both the f… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1508.06964v2-abstract-full').style.display = 'inline'; document.getElementById('1508.06964v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1508.06964v2-abstract-full" style="display: none;"> We study the electron as a system composed by an electron and a photon, using lowest order perturbation theory. We derive the leading-twist transverse-momentum-dependent distribution functions for both the electron and photon in the dressed electron, thereby offering a three-dimensional description of the dressed electron in momentum space. To obtain the distribution functions, we apply both the formalism of light-front wave function overlap representation and the diagrammatic approach. We perform the calculations both in light-cone gauge and Feynman gauge, and we present a detailed discussion of the role of the Wilson lines to obtain gauge-independent results. We provide numerical results and plots for many of the computed distributions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1508.06964v2-abstract-full').style.display = 'none'; document.getElementById('1508.06964v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 December, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 August, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">25 pages, 14 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/1508.00402">arXiv:1508.00402</a> <span> [<a href="https://arxiv.org/pdf/1508.00402">pdf</a>, <a href="https://arxiv.org/format/1508.00402">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/JHEP11(2015)076">10.1007/JHEP11(2015)076 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Effects of TMD evolution and partonic flavor on $e^+e^-$ annihilation into hadrons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/?searchtype=author&query=Echevarria%2C+M+G">Miguel G. Echevarria</a>, <a href="/search/?searchtype=author&query=Mulders%2C+P+J+G">Piet J. G. Mulders</a>, <a href="/search/?searchtype=author&query=Radici%2C+M">Marco Radici</a>, <a href="/search/?searchtype=author&query=Signori%2C+A">Andrea Signori</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="1508.00402v1-abstract-short" style="display: inline;"> We calculate the transverse momentum dependence in the production of two back-to-back hadrons in electron-positron annihilations at the medium/large energy scales of BES-III and BELLE experiments. We use the parameters of the transverse-momentum-dependent (TMD) fragmentation functions that were recently extracted from the semi-inclusive deep-inelastic-scattering multiplicities at low energy from H… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1508.00402v1-abstract-full').style.display = 'inline'; document.getElementById('1508.00402v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1508.00402v1-abstract-full" style="display: none;"> We calculate the transverse momentum dependence in the production of two back-to-back hadrons in electron-positron annihilations at the medium/large energy scales of BES-III and BELLE experiments. We use the parameters of the transverse-momentum-dependent (TMD) fragmentation functions that were recently extracted from the semi-inclusive deep-inelastic-scattering multiplicities at low energy from HERMES. TMD evolution is applied according to different approaches and using different parameters for the nonperturbative part of the evolution kernel, thus exploring the sensitivity of our results to these different choices and to the flavor dependence of parton fragmentation functions. We discuss how experimental measurements could discriminate among the various scenarios. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1508.00402v1-abstract-full').style.display = 'none'; document.getElementById('1508.00402v1-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 August, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">33 pages, 10 composite figures, JHEP style file</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> NIKHEF preprint number 2014-035 </p> </li> </ol> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" 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