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is-link">Go</button> </div> </div> </form> </div> </div> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Guzey%2C+V&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Guzey%2C+V&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Guzey%2C+V&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> <li> <a href="/search/?searchtype=author&query=Guzey%2C+V&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/2411.10103">arXiv:2411.10103</a> <span> [<a href="https://arxiv.org/pdf/2411.10103">pdf</a>, <a href="https://arxiv.org/format/2411.10103">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"> Suppression of diffraction in DIS on nuclei and dynamical mechanism of leading twist nuclear shadowing </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</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="2411.10103v1-abstract-short" style="display: inline;"> Using the leading twist approach (LTA) to nuclear shadowing (NS), we calculate the ratio of the diffractive-to-total DIS cross sections $R_{\rm diff/tot}$ for a heavy nucleus and proton and confirm that $R_{\rm diff/tot} \approx 0.5-1$ in contrast with $R_{\rm diff/tot} \approx 1.5-2$ in the dipole model. We show that the magnitude of $R_{\rm diff/tot}$ is controlled by an effective dipole cross s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.10103v1-abstract-full').style.display = 'inline'; document.getElementById('2411.10103v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.10103v1-abstract-full" style="display: none;"> Using the leading twist approach (LTA) to nuclear shadowing (NS), we calculate the ratio of the diffractive-to-total DIS cross sections $R_{\rm diff/tot}$ for a heavy nucleus and proton and confirm that $R_{\rm diff/tot} \approx 0.5-1$ in contrast with $R_{\rm diff/tot} \approx 1.5-2$ in the dipole model. We show that the magnitude of $R_{\rm diff/tot}$ is controlled by an effective dipole cross section so that $R_{\rm diff/tot} \to 1$ in the black disk limit. We also argue that strong leading twist NS as well as the dilute nuclear density deplete nuclear enhancement of the saturation scale leading to $Q_{sA}^2(b=0)/Q_{sp}^2(b=0) \sim 1$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.10103v1-abstract-full').style.display = 'none'; document.getElementById('2411.10103v1-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 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 2 figures. Contribution to the Proceedings of Diffraction and Low-$x$ 2024, Palermo, Italy, September 8-14, 2024</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.02171">arXiv:2407.02171</a> <span> [<a href="https://arxiv.org/pdf/2407.02171">pdf</a>, <a href="https://arxiv.org/format/2407.02171">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"> Dijet photoproduction and transverse-plane geometry in ultra-peripheral nucleus-nucleus collisions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Eskola%2C+K+J">Kari J. Eskola</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">Vadim Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Helenius%2C+I">Ilkka Helenius</a>, <a href="/search/hep-ph?searchtype=author&query=Paakkinen%2C+P">Petja Paakkinen</a>, <a href="/search/hep-ph?searchtype=author&query=Paukkunen%2C+H">Hannu Paukkunen</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="2407.02171v1-abstract-short" style="display: inline;"> We present new NLO pQCD predictions for the inclusive photoproduction of dijets in ultra-peripheral (UPC) lead-lead collisions at 5.02 TeV with a realistic impact-parameter dependent effective photon flux obtained through the Woods-Saxon nuclear profile. For the first time in NLO inclusive UPC dijet predictions, we take into account also the modelling of the forward-neutron event class required in… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.02171v1-abstract-full').style.display = 'inline'; document.getElementById('2407.02171v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.02171v1-abstract-full" style="display: none;"> We present new NLO pQCD predictions for the inclusive photoproduction of dijets in ultra-peripheral (UPC) lead-lead collisions at 5.02 TeV with a realistic impact-parameter dependent effective photon flux obtained through the Woods-Saxon nuclear profile. For the first time in NLO inclusive UPC dijet predictions, we take into account also the modelling of the forward-neutron event class required in the experimental measurements. We show that since the dijet photoproduction at forward rapidities requires an energetic photon in the initial state, this biases the cross section to be dominated by events with relatively small impact parameters between the nuclei, of the order of a few nuclear radii. This leads to a sensitivity to the transverse-plane collision geometry, which we take properly into account by including effects from the finite extent of both the photon-emitting and the target nucleus. We also test the potential sensitivity to the spatial dependence of nuclear parton distribution functions in connection with this finding. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.02171v1-abstract-full').style.display = 'none'; document.getElementById('2407.02171v1-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 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">5 pages, 2 figures, presented at the 31st International Workshop on Deep Inelastic Scattering (DIS2024)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2406.12936">arXiv:2406.12936</a> <span> [<a href="https://arxiv.org/pdf/2406.12936">pdf</a>, <a href="https://arxiv.org/format/2406.12936">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"> Global fits of proton PDFs with non-linear corrections from gluon recombination </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Duwent%C3%A4ster%2C+P">Pit Duwent盲ster</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">Vadim Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Helenius%2C+I">Ilkka Helenius</a>, <a href="/search/hep-ph?searchtype=author&query=Paukkunen%2C+H">Hannu Paukkunen</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="2406.12936v1-abstract-short" style="display: inline;"> We present numerical studies of the leading non-linear corrections to the DGLAP evolution equations of parton distribution functions (PDFs) resulting from gluon recombination, which reduce the pace of evolution at small momentum fractions $x$. The non-linear evolution is implemented in the \textsc{HOPPET} and \textsc{xFitter} toolkits and used to carry out fits of proton PDFs using lepton-proton d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.12936v1-abstract-full').style.display = 'inline'; document.getElementById('2406.12936v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.12936v1-abstract-full" style="display: none;"> We present numerical studies of the leading non-linear corrections to the DGLAP evolution equations of parton distribution functions (PDFs) resulting from gluon recombination, which reduce the pace of evolution at small momentum fractions $x$. The non-linear evolution is implemented in the \textsc{HOPPET} and \textsc{xFitter} toolkits and used to carry out fits of proton PDFs using lepton-proton deep inelastic scattering data from HERA, BCDMS and NMC. While we do not find evidence for non-linear effects, we are able to set upper limits for their strength. We also quantify the potential impact of longitudinal structure function measurements at the Electron-Ion Collider and the Large Hadron Electron Collider on future fits. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.12936v1-abstract-full').style.display = 'none'; document.getElementById('2406.12936v1-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, 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">to appear in the proceedings of the 31st International Workshop on Deep Inelastic Scattering (DIS2024), 8-12 April 2024, Grenoble, France</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2405.03337">arXiv:2405.03337</a> <span> [<a href="https://arxiv.org/pdf/2405.03337">pdf</a>, <a href="https://arxiv.org/format/2405.03337">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"> Collision geometry in UPC dijet production </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Eskola%2C+K+J">Kari J. Eskola</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">Vadim Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Helenius%2C+I">Ilkka Helenius</a>, <a href="/search/hep-ph?searchtype=author&query=Paakkinen%2C+P">Petja Paakkinen</a>, <a href="/search/hep-ph?searchtype=author&query=Paukkunen%2C+H">Hannu Paukkunen</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="2405.03337v1-abstract-short" style="display: inline;"> We present a comprehensive NLO pQCD study on inclusive dijet photoproduction in ultraperipheral nucleus-nucleus collisions (UPCs). Our analysis takes into account the finite size of both the photon-emitting and the target nucleus, estimated using the Wood-Saxon nuclear density profile. We show that a significant part of the measured dijets at large $z_纬$ in UPC Pb+Pb collisions at 5.02 TeV come fr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.03337v1-abstract-full').style.display = 'inline'; document.getElementById('2405.03337v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2405.03337v1-abstract-full" style="display: none;"> We present a comprehensive NLO pQCD study on inclusive dijet photoproduction in ultraperipheral nucleus-nucleus collisions (UPCs). Our analysis takes into account the finite size of both the photon-emitting and the target nucleus, estimated using the Wood-Saxon nuclear density profile. We show that a significant part of the measured dijets at large $z_纬$ in UPC Pb+Pb collisions at 5.02 TeV come from events with relatively small impact parameters of the order of a few nuclear radii, and the cross section predictions thus become sensitive to the modelling of the collision geometry and photon flux near the source nucleus. In addition, we include the modelling of electromagnetic breakup survival factor needed for a direct comparison with the experimental data and study the resolution power of this process in terms of the impact-parameter dependent nuclear parton distribution functions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.03337v1-abstract-full').style.display = 'none'; document.getElementById('2405.03337v1-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 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">8 pages, 5 figures, 1st International Workshop on the physics of Ultra Peripheral Collisions (UPC 2023)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2404.17476">arXiv:2404.17476</a> <span> [<a href="https://arxiv.org/pdf/2404.17476">pdf</a>, <a href="https://arxiv.org/format/2404.17476">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Nuclear suppression of coherent $J/蠄$ photoproduction in heavy-ion UPCs and leading twist nuclear shadowing </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Strikman%2C+M">M. Strikman</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="2404.17476v2-abstract-short" style="display: inline;"> We determine the nuclear suppression factor $S_{Pb}(x)$, where $x=M_{J/蠄}^2/W_{纬p}^2$ with $M_{J/蠄}$ the $J/蠄$ mass and $W_{纬p}$ the photon-nucleon energy, for the cross section of coherent $J/蠄$ photoproduction in heavy-ion ultraperipheral collisions (UPCs) at the Large Hadron Collider (LHC) and Relativistic Heavy Ion Collider (RHIC) by performing the $蠂^2$ fit to all available data on the cross… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.17476v2-abstract-full').style.display = 'inline'; document.getElementById('2404.17476v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2404.17476v2-abstract-full" style="display: none;"> We determine the nuclear suppression factor $S_{Pb}(x)$, where $x=M_{J/蠄}^2/W_{纬p}^2$ with $M_{J/蠄}$ the $J/蠄$ mass and $W_{纬p}$ the photon-nucleon energy, for the cross section of coherent $J/蠄$ photoproduction in heavy-ion ultraperipheral collisions (UPCs) at the Large Hadron Collider (LHC) and Relativistic Heavy Ion Collider (RHIC) by performing the $蠂^2$ fit to all available data on the cross section $d蟽^{AA \to J/蠄AA}/dy$ as a function of the $J/蠄$ rapidity $y$ and the photoproduction cross section $蟽^{纬A \to J/蠄A}(W_{纬p})$ as a function of $W_{纬p}$. We find that while the $d蟽^{AA \to J/蠄AA}/dy$ data alone constrain $S_{Pb}(x)$ for $x \geq 10^{-3}$, the combined $d蟽^{AA \to J/蠄AA}/dy$ and $蟽^{纬A \to J/蠄A}(W_{纬p})$ data allow us to determine $S_{Pb}(x)$ in the wide interval $10^{-5} < x < 0.05$. In particular, the data favor $S_{Pb}(x)$, which decreases with a decrease of $x$ in the $10^{-4} < x < 0.01$ interval, and can be both decreasing or constant for $x< 10^{-4}$. Identifying $S_{Pb}(x)$ with the ratio of the gluon distributions in Pb and the proton $R_g(x,Q_0^2)=g_A(x,Q_0^2)/[A g_p(x,Q_0^2)]$, we demonstrate that the leading twist approximation (LTA) for nuclear shadowing provides a good description of all the data on $d蟽^{AA \to J/蠄AA}/dy$ and $蟽^{纬A \to J/蠄A}(W_{纬p})$ as well as on the experimental values for $S_{Pb}(x)$ derived from $蟽^{纬A \to J/蠄A}(W_{纬p})$. We also show that modern nuclear PDFs reasonably reproduce $S_{Pb}(x)$ as well. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.17476v2-abstract-full').style.display = 'none'; document.getElementById('2404.17476v2-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 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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">18 pages, 11 figures. Final version matching the published one</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2404.09731">arXiv:2404.09731</a> <span> [<a href="https://arxiv.org/pdf/2404.09731">pdf</a>, <a href="https://arxiv.org/format/2404.09731">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"> Spatial resolution of dijet photoproduction in near-encounter ultraperipheral nuclear collisions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Eskola%2C+K+J">Kari J. Eskola</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">Vadim Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Helenius%2C+I">Ilkka Helenius</a>, <a href="/search/hep-ph?searchtype=author&query=Paakkinen%2C+P">Petja Paakkinen</a>, <a href="/search/hep-ph?searchtype=author&query=Paukkunen%2C+H">Hannu Paukkunen</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="2404.09731v2-abstract-short" style="display: inline;"> We present next-to-leading order perturbative QCD predictions for inclusive dijet photoproduction in ultra-peripheral nucleus-nucleus collisions (UPCs) within the impact-parameter dependent equivalent photon approximation. Taking into account the finite size of both the photon-emitting and the target nucleus, we show that this process is sensitive to the transverse-plane geometry of the UPC events… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.09731v2-abstract-full').style.display = 'inline'; document.getElementById('2404.09731v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2404.09731v2-abstract-full" style="display: none;"> We present next-to-leading order perturbative QCD predictions for inclusive dijet photoproduction in ultra-peripheral nucleus-nucleus collisions (UPCs) within the impact-parameter dependent equivalent photon approximation. Taking into account the finite size of both the photon-emitting and the target nucleus, we show that this process is sensitive to the transverse-plane geometry of the UPC events. We show that this leads to a sizeable, 20-40% effect for large values of the $z_纬$ variable in the dijet photoproduction cross section in lead-lead UPCs at 5.02 TeV compared to the widely-used pointlike approximation where the nuclear radius is accounted for only as a sharp cut-off in the photon flux calculation. This resolution of the spatial degrees of freedom is a result of having high-transverse-momentum jets in the final state, which at the large-$z_纬$ kinematics requires a highly energetic photon in the initial state, thus biasing the collisions to small impact-parameter ''near-encounter'' configurations. We further discuss the role of the forward-neutron event-class selection in isolating the photonuclear cross section in the nucleus-nucleus collisions, and employ the needed electromagnetic breakup survival factor in our predictions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.09731v2-abstract-full').style.display = 'none'; document.getElementById('2404.09731v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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">13 pages, 10 figures; accepted for publication in Physical Review C</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.17449">arXiv:2403.17449</a> <span> [<a href="https://arxiv.org/pdf/2403.17449">pdf</a>, <a href="https://arxiv.org/format/2403.17449">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Inclusive and diffractive dijet photoproduction in ultraperipheral Pb-Pb collisions at the LHC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</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="2403.17449v1-abstract-short" style="display: inline;"> In this contribution, we summarize NLO pQCD predictions for inclusive and diffractive dijet photoproduction in Pb-Pb UPCs at the LHC. We demonstrate that the theory describes well the preliminary ATLAS data on the inclusive cross section, which probes nuclear parton distributions (PDFs) down to $x_A \approx 0.005$ and which can reduce current uncertainties of the small-$x$ nuclear gluon distributi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.17449v1-abstract-full').style.display = 'inline'; document.getElementById('2403.17449v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.17449v1-abstract-full" style="display: none;"> In this contribution, we summarize NLO pQCD predictions for inclusive and diffractive dijet photoproduction in Pb-Pb UPCs at the LHC. We demonstrate that the theory describes well the preliminary ATLAS data on the inclusive cross section, which probes nuclear parton distributions (PDFs) down to $x_A \approx 0.005$ and which can reduce current uncertainties of the small-$x$ nuclear gluon distribution by approximately a factor of 2. Employing predictions of the leading twist approach to nuclear shadowing for nuclear diffractive PDFs, we calculate the cross section of diffractive dijet photoproduction and show that its $x_纬$ dependence is sensitive to the effect of nuclear shadowing and the mechanism of QCD factorization breaking in hard diffraction. We also find that due to large leading twist nuclear shadowing and restricted kinematics, the diffractive contribution to the inclusive cross section of dijet photoproduction does not exceed $5-10$%, which helps with an ambiguous interpretation of the ATLAS data. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.17449v1-abstract-full').style.display = 'none'; document.getElementById('2403.17449v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 6 figures. Contains some updated results compared to published ones. Contribution to Proc. of 1st International Workshop on the physics of Ultra Peripheral Collisions (UPC 2023)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.08342">arXiv:2403.08342</a> <span> [<a href="https://arxiv.org/pdf/2403.08342">pdf</a>, <a href="https://arxiv.org/format/2403.08342">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Suppression of diffraction in deep-inelastic scattering on nuclei and dynamical mechanism of leading twist nuclear shadowing </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Strikman%2C+M">M. Strikman</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="2403.08342v2-abstract-short" style="display: inline;"> Using the leading twist approach (LTA) to nuclear shadowing, we calculate the ratios of diffractive and usual parton distributions for a heavy nucleus (Pb) and the proton, $R_{A/p}=(f_{i/A}^{D(3)}/f_{i/A})/(f_{i/p}^{D(3)}/f_{i/p})$, for coherent and summed (coherent plus quasi-elastic) nuclear deep-inelastic scattering. We find that $R_{A/p} \approx 0.5-1$ for quarks as well as for the ratio of th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.08342v2-abstract-full').style.display = 'inline'; document.getElementById('2403.08342v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.08342v2-abstract-full" style="display: none;"> Using the leading twist approach (LTA) to nuclear shadowing, we calculate the ratios of diffractive and usual parton distributions for a heavy nucleus (Pb) and the proton, $R_{A/p}=(f_{i/A}^{D(3)}/f_{i/A})/(f_{i/p}^{D(3)}/f_{i/p})$, for coherent and summed (coherent plus quasi-elastic) nuclear deep-inelastic scattering. We find that $R_{A/p} \approx 0.5-1$ for quarks as well as for the ratio of the diffractive and total cross sections $[(d蟽_{\rm diff}/dM_X^2)/蟽_{\rm tot}]_{eA}/[(d蟽_{\rm diff}/dM_X^2)/蟽_{\rm tot}]_{ep}$ and $R_{A/p} \approx 0.5-1.3$ for gluons in a broad range of $x$, including the kinematics of the Electron-Ion Collider, which reaffirms the difference from the nuclear enhancement of $R_{A/p}$ predicted in the gluon saturation framework. We demonstrate that the magnitude of $R_{A/p}$ is controlled by the cross section of the interaction of hadronic fluctuations of the virtual photon with target nucleons, which explains an enhancement of $R_{A/p}$ in the color dipole model and its suppression in LTA. We argue that the black disk limit corresponds to $R_{A/p}=1$ and $R^{\rm coh}_{A/p}=0.86$ for the summed and coherent scattering, respectively. Relying on an intuitive definition of the saturation scale, we show that the ratio of the saturation scales of a heavy nucleus and proton $Q_{sA}^2(b)/Q_{sp}^2(b) \approx 1$ at small impact parameters $b$ due to the strong leading twist nuclear shadowing and diluteness of the nuclear density. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.08342v2-abstract-full').style.display = 'none'; document.getElementById('2403.08342v2-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, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, 8 figures. Final version matching the published one</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2402.19060">arXiv:2402.19060</a> <span> [<a href="https://arxiv.org/pdf/2402.19060">pdf</a>, <a href="https://arxiv.org/format/2402.19060">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Slicing Pomerons in ultraperipheral collisions using forward neutrons from nuclear breakup </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Alvioli%2C+M">M. Alvioli</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Strikman%2C+M">M. Strikman</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="2402.19060v2-abstract-short" style="display: inline;"> We argue that measurements of forward neutrons from nuclear breakup in inclusive high energy photon-nucleus ($纬A$) scattering provide a novel way to study small-$x$ dynamics of QCD in heavy-ion ultraperipheral collisions (UPCs). Using models for hadronic fluctuations of the real photon and neutron emission in nuclear fragmentation, we calculate the distribution over the number of evaporation neutr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.19060v2-abstract-full').style.display = 'inline'; document.getElementById('2402.19060v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.19060v2-abstract-full" style="display: none;"> We argue that measurements of forward neutrons from nuclear breakup in inclusive high energy photon-nucleus ($纬A$) scattering provide a novel way to study small-$x$ dynamics of QCD in heavy-ion ultraperipheral collisions (UPCs). Using models for hadronic fluctuations of the real photon and neutron emission in nuclear fragmentation, we calculate the distribution over the number of evaporation neutrons produced in $纬Pb$ collisions at the LHC. We show that it is correlated with the number of wounded nucleons (inelastic collisions) and, hence, can constrain the mechanism of nuclear shadowing and its $x$ dependence. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.19060v2-abstract-full').style.display = 'none'; document.getElementById('2402.19060v2-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 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 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">9 pages, 4 figures. Revised version</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.12993">arXiv:2312.12993</a> <span> [<a href="https://arxiv.org/pdf/2312.12993">pdf</a>, <a href="https://arxiv.org/format/2312.12993">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"> Proton PDFs with non-linear corrections from gluon recombination </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Duwent%C3%A4ster%2C+P">Pit Duwent盲ster</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">Vadim Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Helenius%2C+I">Ilkka Helenius</a>, <a href="/search/hep-ph?searchtype=author&query=Paukkunen%2C+H">Hannu Paukkunen</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2312.12993v1-abstract-short" style="display: inline;"> We present numerical studies of the leading non-linear corrections to the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi evolution equations of parton distribution functions (PDFs) resulting from gluon recombination. The effect of these corrections is to reduce the pace of evolution at small momentum fractions $x$, while slightly increasing it at intermediate $x$. By implementing the non-linear evolut… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.12993v1-abstract-full').style.display = 'inline'; document.getElementById('2312.12993v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.12993v1-abstract-full" style="display: none;"> We present numerical studies of the leading non-linear corrections to the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi evolution equations of parton distribution functions (PDFs) resulting from gluon recombination. The effect of these corrections is to reduce the pace of evolution at small momentum fractions $x$, while slightly increasing it at intermediate $x$. By implementing the non-linear evolution in the xFitter framework, we have carried out fits of proton PDFs using data on lepton-proton deep inelastic scattering from HERA, BCDMS and NMC. While we find no evidence for the presence of non-linearities, they cannot be entirely excluded either and we are able to set limits for their strength. In terms of the recombination scale $Q_r$, which plays a similar role as the saturation scale in the dipole picture of the proton, we find that $Q_r \lesssim 2.5\,{\rm GeV}$. We also quantify the impact of the non-linear terms for the longitudinal structure function at the Electron-Ion Collider and the Large Hadron Electron Collider and find that these measurements could provide stronger constraints on the projected effects. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.12993v1-abstract-full').style.display = 'none'; document.getElementById('2312.12993v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">20 pages, 9 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/2311.17611">arXiv:2311.17611</a> <span> [<a href="https://arxiv.org/pdf/2311.17611">pdf</a>, <a href="https://arxiv.org/format/2311.17611">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"> Illuminating the impact-parameter dependence of UPC dijet photoproduction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Eskola%2C+K+J">Kari J. Eskola</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">Vadim Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Helenius%2C+I">Ilkka Helenius</a>, <a href="/search/hep-ph?searchtype=author&query=Paakkinen%2C+P">Petja Paakkinen</a>, <a href="/search/hep-ph?searchtype=author&query=Paukkunen%2C+H">Hannu Paukkunen</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="2311.17611v1-abstract-short" style="display: inline;"> We present new NLO pQCD predictions for photoproduction of dijets in ultraperipheral PbPb collisions at 5.02 TeV with a realistic photon flux and up-to-date nuclear PDFs. Our calculation of the impact parameter dependence of the photon flux includes the effects of the nuclear form factor in the photon-emitting nucleus and the spatial dependence of nuclear PDFs of the target nucleus, which are esti… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.17611v1-abstract-full').style.display = 'inline'; document.getElementById('2311.17611v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.17611v1-abstract-full" style="display: none;"> We present new NLO pQCD predictions for photoproduction of dijets in ultraperipheral PbPb collisions at 5.02 TeV with a realistic photon flux and up-to-date nuclear PDFs. Our calculation of the impact parameter dependence of the photon flux includes the effects of the nuclear form factor in the photon-emitting nucleus and the spatial dependence of nuclear PDFs of the target nucleus, which are estimated using the Wood-Saxon nuclear density profile. We show that a significant portion of the measured dijets at large $z_纬$ originate from events with impact parameters of the order of a few nuclear radii, and that the cross section predictions therefore become sensitive to the modelling of the nuclear geometry and photon flux close to the source nucleus. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.17611v1-abstract-full').style.display = 'none'; document.getElementById('2311.17611v1-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 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">4 pages, 2 figures, presented at the XXXth International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2023), Houston, Texas, 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/2308.06984">arXiv:2308.06984</a> <span> [<a href="https://arxiv.org/pdf/2308.06984">pdf</a>, <a href="https://arxiv.org/format/2308.06984">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> <p class="title is-5 mathjax"> Exclusive quarkonium photoproduction in $A$+$A$ UPCs at the LHC in NLO pQCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Eskola%2C+K+J">Kari J. Eskola</a>, <a href="/search/hep-ph?searchtype=author&query=Flett%2C+C+A">Christopher A. Flett</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">Vadim Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=L%C3%B6yt%C3%A4inen%2C+T">Topi L枚yt盲inen</a>, <a href="/search/hep-ph?searchtype=author&query=Paukkunen%2C+H">Hannu Paukkunen</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="2308.06984v1-abstract-short" style="display: inline;"> We present the first study of coherent exclusive quarkonium ($J/蠄$, $违$) photoproduction in ultraperipheral nucleus-nucleus collisions (UPCs) at the LHC in the framework of collinear factorization and next-to-leading order (NLO) perturbative QCD (pQCD). We make NLO predictions for the $J/蠄$ and $违$ rapidity distributions for lead (Pb) and oxygen (O) beams, and quantify their dependence on the fact… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.06984v1-abstract-full').style.display = 'inline'; document.getElementById('2308.06984v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2308.06984v1-abstract-full" style="display: none;"> We present the first study of coherent exclusive quarkonium ($J/蠄$, $违$) photoproduction in ultraperipheral nucleus-nucleus collisions (UPCs) at the LHC in the framework of collinear factorization and next-to-leading order (NLO) perturbative QCD (pQCD). We make NLO predictions for the $J/蠄$ and $违$ rapidity distributions for lead (Pb) and oxygen (O) beams, and quantify their dependence on the factorization/renormalization scale, nuclear parton distribution functions (PDFs) and their uncertainties, and on differences between nuclear PDFs and generalized parton distribution functions (GPDs). We show that within the PDF-originating uncertainties our approach provides a good description of the available $J/蠄$ photoproduction data in Pb+Pb UPCs at the LHC but that the scale uncertainty is significant. We demonstrate that at NLO pQCD the quark contributions are important in the $J/蠄$ case but that gluons clearly dominate the $违$ cross sections. We also study how the scale dependence could be tamed by considering O+O/Pb+Pb ratios of the exclusive $J/蠄$ UPC cross sections, and how HERA and p+p/Pb LHC data can help in obtaining better-controlled NLO predictions in the $违$ case. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.06984v1-abstract-full').style.display = 'none'; document.getElementById('2308.06984v1-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 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 5 figures, contributed talk by K.J.E. at the 11th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, Hard Probes 2023, 26-31 March 2023, Aschaffenburg, Germany</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2308.04746">arXiv:2308.04746</a> <span> [<a href="https://arxiv.org/pdf/2308.04746">pdf</a>, <a href="https://arxiv.org/format/2308.04746">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> UPCs as probes of partonic structure -- exclusive and inclusive processes </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</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="2308.04746v1-abstract-short" style="display: inline;"> Ultraperipheral collisions (UPCs) at the LHC and RHIC provide important new information on the partonic structure of the proton and nuclei and small-$x$ dynamics in QCD. We review phenomenological applications of the collinear factorization at leading and next-to-leading orders of perturbative QCD and the dipole model to coherent and incoherent $J/蠄$ photoproduction in Pb-Pb UPCs at the LHC emphas… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.04746v1-abstract-full').style.display = 'inline'; document.getElementById('2308.04746v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2308.04746v1-abstract-full" style="display: none;"> Ultraperipheral collisions (UPCs) at the LHC and RHIC provide important new information on the partonic structure of the proton and nuclei and small-$x$ dynamics in QCD. We review phenomenological applications of the collinear factorization at leading and next-to-leading orders of perturbative QCD and the dipole model to coherent and incoherent $J/蠄$ photoproduction in Pb-Pb UPCs at the LHC emphasizing the strong leading twist gluon nuclear shadowing, the role of quark-antiquark-gluon dipoles, and a possible onset the gluon saturation in nuclei. We also discuss inclusive and diffractive dijet photoproduction in UPCs, which give complementary constraints on nuclear parton distributions and the pattern of factorization breaking in diffraction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.04746v1-abstract-full').style.display = 'none'; document.getElementById('2308.04746v1-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 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 2 figures. Proceedings for Hard Probes 2023, Aschaffenburg, Germany</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.12630">arXiv:2303.12630</a> <span> [<a href="https://arxiv.org/pdf/2303.12630">pdf</a>, <a href="https://arxiv.org/format/2303.12630">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Exclusive heavy vector meson photoproduction on nuclei in NLO perturbative QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Eskola%2C+K+J">K. J. Eskola</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=L%C3%B6yt%C3%A4inen%2C+T">T. L枚yt盲inen</a>, <a href="/search/hep-ph?searchtype=author&query=Paukkunen%2C+H">H. Paukkunen</a>, <a href="/search/hep-ph?searchtype=author&query=Flett%2C+C+A">C. A. Flett</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="2303.12630v1-abstract-short" style="display: inline;"> We make predictions for the cross section of coherent $J/蠄$ photoproduction in Pb-Pb and O-O ultraperipheral collisions (UPCs) at the LHC as a function of the $J/蠄$ rapidity $y$ in the framework of collinear factorization and next-to-leading order (NLO) perturbative QCD. We quantify the strong scale dependence and significant uncertainties due to nuclear PDFs and show that our approach provides a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.12630v1-abstract-full').style.display = 'inline'; document.getElementById('2303.12630v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.12630v1-abstract-full" style="display: none;"> We make predictions for the cross section of coherent $J/蠄$ photoproduction in Pb-Pb and O-O ultraperipheral collisions (UPCs) at the LHC as a function of the $J/蠄$ rapidity $y$ in the framework of collinear factorization and next-to-leading order (NLO) perturbative QCD. We quantify the strong scale dependence and significant uncertainties due to nuclear PDFs and show that our approach provides a reasonable description of the LHC data on coherent $J/蠄$ photoproduction in Pb-Pb UPCs. We demonstrate that these uncertainties are reduced by approximately a factor of 10 in the scaled ratio of the O-O and Pb-Pb UPC cross sections. Our analysis indicates the dominance of the quark contribution to the UPC cross section at central rapidities, which affects the interpretation of the UPC data. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.12630v1-abstract-full').style.display = 'none'; document.getElementById('2303.12630v1-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, 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">10 pages, 6 figures. Contribution to Proceedings of XXIX Cracow EPIPHANY Conference on Physics at the Electron-Ion Collider and Future Facilities, Cracow, Poland, January 16-19, 2023</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.05182">arXiv:2303.05182</a> <span> [<a href="https://arxiv.org/pdf/2303.05182">pdf</a>, <a href="https://arxiv.org/ps/2303.05182">ps</a>, <a href="https://arxiv.org/format/2303.05182">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Inclusive and diffractive dijet photoproduction at the Electron-Ion Collider in NLO QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Klasen%2C+M">M. Klasen</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="2303.05182v2-abstract-short" style="display: inline;"> In the framework of collinear factorization and next-to-leading order (NLO) perturbative QCD, we make predictions for inclusive and diffractive dijet photoproduction in electron-proton and electron-nucleus scattering in the EIC kinematics. We establish kinematic ranges in the ${\bar p}_T$, ${\bar 畏}$, $x_A^{\rm obs}$ and $x_纬^{\rm obs}$ variables, quantify sensitivity to small-$x$ nuclear PDFs, an… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.05182v2-abstract-full').style.display = 'inline'; document.getElementById('2303.05182v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.05182v2-abstract-full" style="display: none;"> In the framework of collinear factorization and next-to-leading order (NLO) perturbative QCD, we make predictions for inclusive and diffractive dijet photoproduction in electron-proton and electron-nucleus scattering in the EIC kinematics. We establish kinematic ranges in the ${\bar p}_T$, ${\bar 畏}$, $x_A^{\rm obs}$ and $x_纬^{\rm obs}$ variables, quantify sensitivity to small-$x$ nuclear PDFs, and analyze various scenarios of factorization breaking in the case of diffractive scattering. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.05182v2-abstract-full').style.display = 'none'; document.getElementById('2303.05182v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 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">10 pages, 5 figures. Contribution to Proceedings of XXIX Cracow EPIPHANY Conference on Physics at the Electron-Ion Collider and Future Facilities, Cracow, Poland, January 16-19, 2023</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MS-TP-23-08 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.03007">arXiv:2303.03007</a> <span> [<a href="https://arxiv.org/pdf/2303.03007">pdf</a>, <a href="https://arxiv.org/format/2303.03007">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"> Predictions for exclusive $违$ photoproduction in ultraperipheral ${\rm Pb}+{\rm Pb}$ collisions at the LHC at next-to-leading order in perturbative QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Eskola%2C+K+J">Kari J. Eskola</a>, <a href="/search/hep-ph?searchtype=author&query=Flett%2C+C+A">Christopher A. Flett</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">Vadim Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=L%C3%B6yt%C3%A4inen%2C+T">Topi L枚yt盲inen</a>, <a href="/search/hep-ph?searchtype=author&query=Paukkunen%2C+H">Hannu Paukkunen</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="2303.03007v1-abstract-short" style="display: inline;"> We present predictions for the rapidity-differential cross sections of exclusive $违$ photoproduction in ultraperipheral collisions (UPCs) of lead ions at the Large Hadron Collider (LHC). We work in the framework of collinear factorization at next-to-leading order (NLO) in perturbative QCD, modeling the generalized parton distributions (GPDs) through the Shuvaev transform of nuclear parton distribu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.03007v1-abstract-full').style.display = 'inline'; document.getElementById('2303.03007v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.03007v1-abstract-full" style="display: none;"> We present predictions for the rapidity-differential cross sections of exclusive $违$ photoproduction in ultraperipheral collisions (UPCs) of lead ions at the Large Hadron Collider (LHC). We work in the framework of collinear factorization at next-to-leading order (NLO) in perturbative QCD, modeling the generalized parton distributions (GPDs) through the Shuvaev transform of nuclear parton distribution functions (nPDFs). While the effects due to the GPD modeling turn out to be small, the direct NLO predictions still carry significant nPDF-originating uncertainties and depend strongly on the choices of the factorization and renormalization scales. To tame the scale dependence and to account for the fact that the NLO calculations generally underpredict the photoproduction measurements on protons, we also present alternative, data-driven predictions. In this approach the underlying photoproduction cross sections on lead are found by combining their nuclear modifications calculated at NLO with the measured photoproduction cross sections on protons. The data-driven strategy reduces the uncertainties associated with the scale choices, and essentially eliminates the effects of GPD modeling thereby leaving the cross sections sensitive mainly to the input nPDFs. Our estimates indicate that the process is measurable in ${\rm Pb}+{\rm Pb}$ collisions at the LHC. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.03007v1-abstract-full').style.display = 'none'; document.getElementById('2303.03007v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">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">14 pages</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.14094">arXiv:2211.14094</a> <span> [<a href="https://arxiv.org/pdf/2211.14094">pdf</a>, <a href="https://arxiv.org/format/2211.14094">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.107.054003">10.1103/PhysRevD.107.054003 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Numerical evaluation of the nonlinear Gribov-Levin-Ryskin-Mueller-Qiu evolution equations for nuclear parton distribution functions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Rausch%2C+J">J. Rausch</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Klasen%2C+M">M. Klasen</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="2211.14094v2-abstract-short" style="display: inline;"> We numerically study for the first time the nonlinear GLR-MQ evolution equations for nuclear parton distribution function (nPDFs) to next-to-leading order accuracy and quantify the impact of gluon recombination at small $x$. Using the nCTEQ15 nPDFs as input, we confirm the importance of the nonlinear corrections for small $x \lesssim 10^{-3}$, whose magnitude increases with a decrease of $x$ and a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.14094v2-abstract-full').style.display = 'inline'; document.getElementById('2211.14094v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.14094v2-abstract-full" style="display: none;"> We numerically study for the first time the nonlinear GLR-MQ evolution equations for nuclear parton distribution function (nPDFs) to next-to-leading order accuracy and quantify the impact of gluon recombination at small $x$. Using the nCTEQ15 nPDFs as input, we confirm the importance of the nonlinear corrections for small $x \lesssim 10^{-3}$, whose magnitude increases with a decrease of $x$ and an increase of the atomic number $A$. We find that at $x=10^{-5}$ and for heavy nuclei, after the upward evolution from $Q_0=2$ GeV to $Q=10$ GeV, the quark singlet $惟(x,Q^2)$ and the gluon $G(x,Q^2)$ distributions become reduced by $9-15$%, respectively. The relative effect is much stronger for the downward evolution from $Q_0=10$ GeV to $Q=2$ GeV, where we find that $惟(x,Q^2)$ is suppressed by 40%, while $G(x, Q^2)$ is enhanced by 140%. These trends propagate into the $F_2^A(x,Q^2)$ nuclear structure function and the $F_L^A(x,Q^2)$ longitudinal structure function, which after the downward evolution become reduced by 45% and enhanced by 80%, respectively. Our analysis indicates that the nonlinear effects are most pronounced in $F_L^A(x,Q^2)$ and are already quite sizable at $x \sim 10^{-3}$ for heavy nuclei. We have checked that our conclusions very weakly depend on the choice of input nPDFs. In particular, using the EPPS21 nPDFs as input, we obtain quantitatively similar results. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.14094v2-abstract-full').style.display = 'none'; document.getElementById('2211.14094v2-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, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">10 pages, 5 figures, final published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MS-TP-22-48 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.16048">arXiv:2210.16048</a> <span> [<a href="https://arxiv.org/pdf/2210.16048">pdf</a>, <a href="https://arxiv.org/format/2210.16048">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/PhysRevC.107.044912">10.1103/PhysRevC.107.044912 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Next-to-leading order perturbative QCD predictions for exclusive $J/蠄$ photoproduction in oxygen-oxygen and lead-lead collisions at the LHC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Eskola%2C+K+J">Kari J. Eskola</a>, <a href="/search/hep-ph?searchtype=author&query=Flett%2C+C+A">Christopher A. Flett</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">Vadim Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=L%C3%B6yt%C3%A4inen%2C+T">Topi L枚yt盲inen</a>, <a href="/search/hep-ph?searchtype=author&query=Paukkunen%2C+H">Hannu Paukkunen</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="2210.16048v2-abstract-short" style="display: inline;"> We present predictions for the cross sections of coherent $J/蠄$ photoproduction in lead-lead and oxygen-oxygen ultraperipheral collisions (UPCs) as a function of the $J/蠄$ rapidity at the LHC in the framework of collinear factorization at next-to-leading order (NLO) in perturbative QCD. Taking generalized parton distribution functions in their forward limit and using the EPPS21, nNNPDF3.0, and nCT… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.16048v2-abstract-full').style.display = 'inline'; document.getElementById('2210.16048v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.16048v2-abstract-full" style="display: none;"> We present predictions for the cross sections of coherent $J/蠄$ photoproduction in lead-lead and oxygen-oxygen ultraperipheral collisions (UPCs) as a function of the $J/蠄$ rapidity at the LHC in the framework of collinear factorization at next-to-leading order (NLO) in perturbative QCD. Taking generalized parton distribution functions in their forward limit and using the EPPS21, nNNPDF3.0, and nCTEQ15WZSIH nuclear parton distribution functions, we update our recent results for Pb-Pb collisions, make detailed predictions for O-O collisions for several beam energy configurations, and examine the ratio of O-O and Pb-Pb UPC cross sections. We show that the latter observable allows one to significantly reduce the scale uncertainty of NLO predictions for this process. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.16048v2-abstract-full').style.display = 'none'; document.getElementById('2210.16048v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">21 pages, 18 figures. Revised version with corrected error bands for nNNPDF3.0 results in Figs. 4 and 15-18. Matches the published Erratum, Phys. Rev. C 108, 069901 (2023)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2209.08327">arXiv:2209.08327</a> <span> [<a href="https://arxiv.org/pdf/2209.08327">pdf</a>, <a href="https://arxiv.org/format/2209.08327">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> <p class="title is-5 mathjax"> Exclusive $J/蠄$ production in ultraperipheral Pb+Pb collisions to NLO pQCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Eskola%2C+K+J">K. J. Eskola</a>, <a href="/search/hep-ph?searchtype=author&query=Flett%2C+C+A">C. A. Flett</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=L%C3%B6yt%C3%A4inen%2C+T">T. L枚yt盲inen</a>, <a href="/search/hep-ph?searchtype=author&query=Paukkunen%2C+H">H. Paukkunen</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="2209.08327v1-abstract-short" style="display: inline;"> We present the first NLO pQCD study of coherent exclusive $J/蠄$ photoproduction in ultraperipheral heavy-ion collisions (UPCs) at the LHC. Taking the generalized parton distributions (GPDs) in their forward limit, as parton distribution functions (PDFs), we quantify the NLO contributions in the rapidity-differential cross section, show that the real part of the amplitude must not be neglected, stu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.08327v1-abstract-full').style.display = 'inline'; document.getElementById('2209.08327v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.08327v1-abstract-full" style="display: none;"> We present the first NLO pQCD study of coherent exclusive $J/蠄$ photoproduction in ultraperipheral heavy-ion collisions (UPCs) at the LHC. Taking the generalized parton distributions (GPDs) in their forward limit, as parton distribution functions (PDFs), we quantify the NLO contributions in the rapidity-differential cross section, show that the real part of the amplitude must not be neglected, study the gluon and quark contributions, chart the scale-choice and PDF uncertainties, and compare the NLO results with LHC and HERA data. We show that the scale dependence is significant but a scale choice can be found with which we reproduce the 2.76 and 5.02 TeV UPC data. In particular, we show that the process is clearly more sensitive to the nuclear quark PDFs than thought before. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.08327v1-abstract-full').style.display = 'none'; document.getElementById('2209.08327v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 5 figures, contributed talk by T.L. at the XXIX International Conference on Ultra-relativistic Nucleus-Nucleus Collisions, Quark Matter 2022, 4-10 April, 2022, Krakow, Poland</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2208.06806">arXiv:2208.06806</a> <span> [<a href="https://arxiv.org/pdf/2208.06806">pdf</a>, <a href="https://arxiv.org/format/2208.06806">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"> Next-to-leading order QCD predictions for exclusive $J/蠄$ photoproduction in ultraperipheral Pb+Pb collisions at the LHC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Eskola%2C+K+J">Kari J. Eskola</a>, <a href="/search/hep-ph?searchtype=author&query=Flett%2C+C+A">Chris A. Flett</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">Vadim Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=L%C3%B6yt%C3%A4inen%2C+T">Topi L枚yt盲inen</a>, <a href="/search/hep-ph?searchtype=author&query=Paukkunen%2C+H">Hannu Paukkunen</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="2208.06806v1-abstract-short" style="display: inline;"> We present the first study of rapidity-differential cross sections of coherent exclusive $J/蠄$ photoproduction in heavy-ion ultraperipheral collisions (UPCs) at the LHC, $\text{d}蟽(\text{Pb}+\text{Pb}\rightarrow \text{Pb}+J/蠄+\text{Pb})/\text{d}y$, to NLO in collinear factorisation. Taking the generalised parton distributions as their forward limit counterparts, the NLO contributions in the cross… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.06806v1-abstract-full').style.display = 'inline'; document.getElementById('2208.06806v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2208.06806v1-abstract-full" style="display: none;"> We present the first study of rapidity-differential cross sections of coherent exclusive $J/蠄$ photoproduction in heavy-ion ultraperipheral collisions (UPCs) at the LHC, $\text{d}蟽(\text{Pb}+\text{Pb}\rightarrow \text{Pb}+J/蠄+\text{Pb})/\text{d}y$, to NLO in collinear factorisation. Taking the generalised parton distributions as their forward limit counterparts, the NLO contributions in the cross sections are quantified and we show that the real part of the amplitude and quark-PDF contributions must not be neglected. We further evaluate the uncertainties arising from the scale-choice at both LO and NLO, and compare our results with exclusive $J/蠄$ photoproduction data in Pb+Pb UPCs from LHC. The scale dependence in $\text{d}蟽(\text{Pb}+\text{Pb}\rightarrow \text{Pb}+J/蠄+\text{Pb})/\text{d}y$ is sizable, but we can find a scale-choice at NLO that reproduces the Pb+Pb UPC data at both Run 1 and Run 2 collision energies. This process has traditionally been suggested to be a direct probe of nuclear gluon distributions. We show that the situation changes rather dramatically from LO to NLO, where the interplay of both gluon and quark contributions, and in particular their relative signs, play a significant role. We end with some concluding remarks about the outlook of this observable within a tamed collinear factorisation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.06806v1-abstract-full').style.display = 'none'; document.getElementById('2208.06806v1-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 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">5 pages, 4 figures. Proceedings of the XXIX International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2022)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> HIP-2022-15/TH </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2206.12120">arXiv:2206.12120</a> <span> [<a href="https://arxiv.org/pdf/2206.12120">pdf</a>, <a href="https://arxiv.org/ps/2206.12120">ps</a>, <a href="https://arxiv.org/format/2206.12120">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.106.064909">10.1103/PhysRevC.106.064909 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Photoproduction of $J/蠄$ in d+Au ultraperipheral collisions at the BNL Relativistic Heavy Ion Collider </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Kryshen%2C+E">E. Kryshen</a>, <a href="/search/hep-ph?searchtype=author&query=Strikman%2C+M">M. Strikman</a>, <a href="/search/hep-ph?searchtype=author&query=Zhalov%2C+M">M. Zhalov</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="2206.12120v3-abstract-short" style="display: inline;"> We argue that the STAR data on $J/蠄$ photoproduction in $d+Au$ ultraperipheral collisions (UPCs) at the momentum transfer $t \neq 0$ primarily probes elastic and possibly nucleon-dissociative $J/蠄$ photoproduction on quasi-free nucleons, while being essentially insensitive to expectedly weak nuclear modifications of the gluon distribution in the deuteron. Analyzing the STAR detector capabilities f… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.12120v3-abstract-full').style.display = 'inline'; document.getElementById('2206.12120v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2206.12120v3-abstract-full" style="display: none;"> We argue that the STAR data on $J/蠄$ photoproduction in $d+Au$ ultraperipheral collisions (UPCs) at the momentum transfer $t \neq 0$ primarily probes elastic and possibly nucleon-dissociative $J/蠄$ photoproduction on quasi-free nucleons, while being essentially insensitive to expectedly weak nuclear modifications of the gluon distribution in the deuteron. Analyzing the STAR detector capabilities for selection of UPC events, we explore the possibility that the contribution of nucleon-dissociative $J/蠄$ photoproduction is negligibly small and obtain a very good description of the $t$ dependence of the STAR total cross section. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.12120v3-abstract-full').style.display = 'none'; document.getElementById('2206.12120v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 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, 2 figures. Final published version</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2205.03861">arXiv:2205.03861</a> <span> [<a href="https://arxiv.org/pdf/2205.03861">pdf</a>, <a href="https://arxiv.org/ps/2205.03861">ps</a>, <a href="https://arxiv.org/format/2205.03861">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> UPC contribution to forward rapidity gap distribution in pPb collisions at the LHC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Strikman%2C+M">M. Strikman</a>, <a href="/search/hep-ph?searchtype=author&query=Zhalov%2C+M">M. Zhalov</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="2205.03861v2-abstract-short" style="display: inline;"> In this Letter, we consider strong and electromagnetic (ultraperipheral) mechanisms in proton-nucleus coherent diffraction at the CERN Large Hadron Collider. We explicitly demonstrate the dominance of the latter and explain the CMS data on the forward rapidity gap distribution in $pPb$ collisions at $\sqrt{s_{NN}}=8.16$ TeV. In particular, we provide simple estimates, which give a good, semi-quant… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.03861v2-abstract-full').style.display = 'inline'; document.getElementById('2205.03861v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2205.03861v2-abstract-full" style="display: none;"> In this Letter, we consider strong and electromagnetic (ultraperipheral) mechanisms in proton-nucleus coherent diffraction at the CERN Large Hadron Collider. We explicitly demonstrate the dominance of the latter and explain the CMS data on the forward rapidity gap distribution in $pPb$ collisions at $\sqrt{s_{NN}}=8.16$ TeV. In particular, we provide simple estimates, which give a good, semi-quantitative description of both magnitude and shape of the $螖畏^F$ distribution in the Pomeron-proton topology. We also make predictions for the proton-oxygen run. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.03861v2-abstract-full').style.display = 'none'; document.getElementById('2205.03861v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 August, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 2 figures, 1 table. Final published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 106, L021901 (2022) </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/hep-ph?searchtype=author&query=Khalek%2C+R+A">R. Abdul Khalek</a>, <a href="/search/hep-ph?searchtype=author&query=D%27Alesio%2C+U">U. D'Alesio</a>, <a href="/search/hep-ph?searchtype=author&query=Arratia%2C+M">M. Arratia</a>, <a href="/search/hep-ph?searchtype=author&query=Bacchetta%2C+A">A. Bacchetta</a>, <a href="/search/hep-ph?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/hep-ph?searchtype=author&query=Begel%2C+M">M. Begel</a>, <a href="/search/hep-ph?searchtype=author&query=Boglione%2C+M">M. Boglione</a>, <a href="/search/hep-ph?searchtype=author&query=Boughezal%2C+R">R. Boughezal</a>, <a href="/search/hep-ph?searchtype=author&query=Boussarie%2C+R">R. Boussarie</a>, <a href="/search/hep-ph?searchtype=author&query=Bozzi%2C+G">G. Bozzi</a>, <a href="/search/hep-ph?searchtype=author&query=Chekanov%2C+S+V">S. V. Chekanov</a>, <a href="/search/hep-ph?searchtype=author&query=Celiberto%2C+F+G">F. G. Celiberto</a>, <a href="/search/hep-ph?searchtype=author&query=Chirilli%2C+G">G. Chirilli</a>, <a href="/search/hep-ph?searchtype=author&query=Cridge%2C+T">T. Cridge</a>, <a href="/search/hep-ph?searchtype=author&query=Cruz-Torres%2C+R">R. Cruz-Torres</a>, <a href="/search/hep-ph?searchtype=author&query=Corliss%2C+R">R. Corliss</a>, <a href="/search/hep-ph?searchtype=author&query=Cotton%2C+C">C. Cotton</a>, <a href="/search/hep-ph?searchtype=author&query=Davoudiasl%2C+H">H. Davoudiasl</a>, <a href="/search/hep-ph?searchtype=author&query=Deshpande%2C+A">A. Deshpande</a>, <a href="/search/hep-ph?searchtype=author&query=Dong%2C+X">X. Dong</a>, <a href="/search/hep-ph?searchtype=author&query=Emmert%2C+A">A. Emmert</a>, <a href="/search/hep-ph?searchtype=author&query=Fazio%2C+S">S. Fazio</a>, <a href="/search/hep-ph?searchtype=author&query=Forte%2C+S">S. Forte</a>, <a href="/search/hep-ph?searchtype=author&query=Furletova%2C+Y">Y. Furletova</a>, <a href="/search/hep-ph?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/2203.12289">arXiv:2203.12289</a> <span> [<a href="https://arxiv.org/pdf/2203.12289">pdf</a>, <a href="https://arxiv.org/format/2203.12289">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1361-6633/ac8228">10.1088/1361-6633/ac8228 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Selected topics in diffraction with protons and nuclei: past, present, and future </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Frankfurt%2C+L">L. Frankfurt</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Stasto%2C+A">A. Stasto</a>, <a href="/search/hep-ph?searchtype=author&query=Strikman%2C+M">M. Strikman</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="2203.12289v1-abstract-short" style="display: inline;"> We review a broad range of phenomena in diffraction in the context of hadron-hadron, hadron-nucleus collisions and deep inelastic lepton-proton/nucleus scattering focusing on the interplay between the perturbative QCD and non-perturbative models. We discuss inclusive diffraction in DIS, phenomenology of dipole models, resummation and parton saturation at low $x$, hard diffractive production of vec… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.12289v1-abstract-full').style.display = 'inline'; document.getElementById('2203.12289v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.12289v1-abstract-full" style="display: none;"> We review a broad range of phenomena in diffraction in the context of hadron-hadron, hadron-nucleus collisions and deep inelastic lepton-proton/nucleus scattering focusing on the interplay between the perturbative QCD and non-perturbative models. We discuss inclusive diffraction in DIS, phenomenology of dipole models, resummation and parton saturation at low $x$, hard diffractive production of vector mesons, inelastic diffraction in hadron-hadron scattering, formalism of color fluctuations, inclusive coherent and incoherent diffraction as well as soft and hard diffraction phenomena in hadron-hadron/nucleus and photon-nucleus collisions. For each topic we review key results from the past and present experiments including HERA and the LHC. Finally, we identify the remaining open questions, which could be addressed in the continuing experiments, in particular in photon-induced reactions at the LHC and the future Electron-Ion Collider (EIC) in the US, Large Hadron electron Collider (LHeC) and Future Circular Collider (FCC) at CERN. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.12289v1-abstract-full').style.display = 'none'; document.getElementById('2203.12289v1-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 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">128 pages, 55 figures. Review prepared for and submitted to Reports on Progress in Physics</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.11613">arXiv:2203.11613</a> <span> [<a href="https://arxiv.org/pdf/2203.11613">pdf</a>, <a href="https://arxiv.org/format/2203.11613">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/PhysRevC.106.035202">10.1103/PhysRevC.106.035202 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Exclusive $J/蠄$ photoproduction in ultraperipheral Pb+Pb collisions at the LHC to next-to-leading order perturbative QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Eskola%2C+K+J">Kari J. Eskola</a>, <a href="/search/hep-ph?searchtype=author&query=Flett%2C+C+A">Christopher A. Flett</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">Vadim Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=L%C3%B6yt%C3%A4inen%2C+T">Topi L枚yt盲inen</a>, <a href="/search/hep-ph?searchtype=author&query=Paukkunen%2C+H">Hannu Paukkunen</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="2203.11613v1-abstract-short" style="display: inline;"> We present the first next-to-leading-order (NLO) perturbative QCD (pQCD) study of rapidity-differential cross sections of coherent exclusive photoproduction of $J/蠄$ mesons in heavy-ion ultraperipheral collisions (UPCs) at the LHC, $d蟽/dy(\text{Pb} + \text{Pb} \rightarrow \text{Pb} + J/蠄+ \text{Pb})$. For this, we account for the photon-nucleon NLO cross sections at the forward limit, the $t$ depe… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.11613v1-abstract-full').style.display = 'inline'; document.getElementById('2203.11613v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.11613v1-abstract-full" style="display: none;"> We present the first next-to-leading-order (NLO) perturbative QCD (pQCD) study of rapidity-differential cross sections of coherent exclusive photoproduction of $J/蠄$ mesons in heavy-ion ultraperipheral collisions (UPCs) at the LHC, $d蟽/dy(\text{Pb} + \text{Pb} \rightarrow \text{Pb} + J/蠄+ \text{Pb})$. For this, we account for the photon-nucleon NLO cross sections at the forward limit, the $t$ dependence using a standard nuclear form factor, and the photon fluxes of the colliding nuclei. Approximating the generalized parton distributions with their forward-limit parton distribution functions (PDFs), we quantify the NLO contributions in the cross sections, show that the real part of the amplitude and quark-PDF contributions must not be neglected, quantify the uncertainties arising from the scale-choice and PDFs, and compare our results with ALICE, CMS and LHCb $J/蠄$ photoproduction data in Pb+Pb UPCs, exclusive $J/蠄$ photoproduction data from HERA, and LHCb data in p+p. The scale dependence in $d蟽/dy(\text{Pb} + \text{Pb} \rightarrow \text{Pb} + J/蠄+ \text{Pb})$ is significant, but we can find a scale-choice that reproduces the Pb+Pb UPC data both at 2.76 and 5.02 TeV collision energies. This process has traditionally been suggested to be a direct probe of nuclear gluon distributions. We show that the situation changes rather dramatically from LO to NLO: the NLO cross sections reflect the nuclear effects of both gluons and quarks in a complicated manner where the relative signs of the LO and NLO terms in the amplitude play a significant role. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.11613v1-abstract-full').style.display = 'none'; document.getElementById('2203.11613v1-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, 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">22 pages, 13 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/2202.12200">arXiv:2202.12200</a> <span> [<a href="https://arxiv.org/pdf/2202.12200">pdf</a>, <a href="https://arxiv.org/format/2202.12200">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/PhysRevLett.129.242503">10.1103/PhysRevLett.129.242503 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Coherent $J/ 蠄$ electroproduction on $^4$He and $^3$He at the Electron-Ion Collider: probing nuclear shadowing one nucleon at a time </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Rinaldi%2C+M">M. Rinaldi</a>, <a href="/search/hep-ph?searchtype=author&query=Scopetta%2C+S">S. Scopetta</a>, <a href="/search/hep-ph?searchtype=author&query=Strikman%2C+M">M. Strikman</a>, <a href="/search/hep-ph?searchtype=author&query=Viviani%2C+M">M. Viviani</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="2202.12200v2-abstract-short" style="display: inline;"> While the phenomenon of gluon nuclear shadowing at small $x$ has been getting confirmation in QCD analyses of various LHC measurements involving heavy nuclei, it has not been possible so far to establish experimentally the number of target nucleons responsible for nuclear shadowing in a given process. To address this issue, we study coherent $J / 蠄$ electroproduction on $^4$He and $^3$He in the ki… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2202.12200v2-abstract-full').style.display = 'inline'; document.getElementById('2202.12200v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2202.12200v2-abstract-full" style="display: none;"> While the phenomenon of gluon nuclear shadowing at small $x$ has been getting confirmation in QCD analyses of various LHC measurements involving heavy nuclei, it has not been possible so far to establish experimentally the number of target nucleons responsible for nuclear shadowing in a given process. To address this issue, we study coherent $J / 蠄$ electroproduction on $^4$He and $^3$He in the kinematics of a future electron-ion collider and show that this process has the power to disentangle the contributions of the interaction with a specific number of nucleons $k$, in particular, with two nucleons at the momentum transfer $t \neq 0$. We predict a dramatic shift of the $t$-dependence of the differential cross section toward smaller values of $|t|$ due to a non-trivial correlation between $x$ and $k$. This calculation, which makes use for the first time of realistic wave functions, provides a stringent test of models of nuclear shadowing and a novel probe of the 3D imaging of gluons in light nuclei. In addition, thanks to this analysis, unique information on the real part of the corresponding scattering amplitude could be accessed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2202.12200v2-abstract-full').style.display = 'none'; document.getElementById('2202.12200v2-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 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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, 7 figures, Supplemental Material. Final published version</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2106.16084">arXiv:2106.16084</a> <span> [<a href="https://arxiv.org/pdf/2106.16084">pdf</a>, <a href="https://arxiv.org/format/2106.16084">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Inclusive and diffractive dijet photoproduction in ultraperipheral heavy ion collisions at the LHC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Klasen%2C+M">M. Klasen</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="2106.16084v1-abstract-short" style="display: inline;"> We calculate the cross section of inclusive dijet photoproduction in ultraperipheral collisions (UPCs) of heavy ions at the CERN Large Hadron Collider using next-to-leading order perturbative QCD and demonstrate that it provides a good description of the ATLAS data. We study the role of this data in constraining nuclear parton distribution functions (nPDFs) using the Bayesian reweighting technique… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.16084v1-abstract-full').style.display = 'inline'; document.getElementById('2106.16084v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2106.16084v1-abstract-full" style="display: none;"> We calculate the cross section of inclusive dijet photoproduction in ultraperipheral collisions (UPCs) of heavy ions at the CERN Large Hadron Collider using next-to-leading order perturbative QCD and demonstrate that it provides a good description of the ATLAS data. We study the role of this data in constraining nuclear parton distribution functions (nPDFs) using the Bayesian reweighting technique and find that it can reduce current uncertainties of nPDFs at small $x$ by a factor of 2. We also make predictions for diffractive dijet photoproduction in UPCs and examine its potential to shed light on the disputed mechanism of QCD factorization breaking in diffraction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.16084v1-abstract-full').style.display = 'none'; document.getElementById('2106.16084v1-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 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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, 4 figures. Submission to SciPost</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MS-TP-21-19 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2105.04345">arXiv:2105.04345</a> <span> [<a href="https://arxiv.org/pdf/2105.04345">pdf</a>, <a href="https://arxiv.org/format/2105.04345">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Prospects for diffractive dijet photoproduction at the EIC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Klasen%2C+M">M. Klasen</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="2105.04345v1-abstract-short" style="display: inline;"> We discuss the prospects of diffractive dijet photoproduction at the EIC to distinguish different fits of diffractive proton PDFs, different schemes of factorization breaking, to determine diffractive nuclear PDFs and pion PDFs from leading neutron production. </span> <span class="abstract-full has-text-grey-dark mathjax" id="2105.04345v1-abstract-full" style="display: none;"> We discuss the prospects of diffractive dijet photoproduction at the EIC to distinguish different fits of diffractive proton PDFs, different schemes of factorization breaking, to determine diffractive nuclear PDFs and pion PDFs from leading neutron production. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.04345v1-abstract-full').style.display = 'none'; document.getElementById('2105.04345v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 May, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MS-TP-21-20 </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/hep-ph?searchtype=author&query=Khalek%2C+R+A">R. Abdul Khalek</a>, <a href="/search/hep-ph?searchtype=author&query=Accardi%2C+A">A. Accardi</a>, <a href="/search/hep-ph?searchtype=author&query=Adam%2C+J">J. Adam</a>, <a href="/search/hep-ph?searchtype=author&query=Adamiak%2C+D">D. Adamiak</a>, <a href="/search/hep-ph?searchtype=author&query=Akers%2C+W">W. Akers</a>, <a href="/search/hep-ph?searchtype=author&query=Albaladejo%2C+M">M. Albaladejo</a>, <a href="/search/hep-ph?searchtype=author&query=Al-bataineh%2C+A">A. Al-bataineh</a>, <a href="/search/hep-ph?searchtype=author&query=Alexeev%2C+M+G">M. G. Alexeev</a>, <a href="/search/hep-ph?searchtype=author&query=Ameli%2C+F">F. Ameli</a>, <a href="/search/hep-ph?searchtype=author&query=Antonioli%2C+P">P. Antonioli</a>, <a href="/search/hep-ph?searchtype=author&query=Armesto%2C+N">N. Armesto</a>, <a href="/search/hep-ph?searchtype=author&query=Armstrong%2C+W+R">W. R. Armstrong</a>, <a href="/search/hep-ph?searchtype=author&query=Arratia%2C+M">M. Arratia</a>, <a href="/search/hep-ph?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/hep-ph?searchtype=author&query=Asaturyan%2C+A">A. Asaturyan</a>, <a href="/search/hep-ph?searchtype=author&query=Asai%2C+M">M. Asai</a>, <a href="/search/hep-ph?searchtype=author&query=Aschenauer%2C+E+C">E. C. Aschenauer</a>, <a href="/search/hep-ph?searchtype=author&query=Aune%2C+S">S. Aune</a>, <a href="/search/hep-ph?searchtype=author&query=Avagyan%2C+H">H. Avagyan</a>, <a href="/search/hep-ph?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/hep-ph?searchtype=author&query=Azmoun%2C+B">B. Azmoun</a>, <a href="/search/hep-ph?searchtype=author&query=Bacchetta%2C+A">A. Bacchetta</a>, <a href="/search/hep-ph?searchtype=author&query=Baker%2C+M+D">M. D. Baker</a>, <a href="/search/hep-ph?searchtype=author&query=Barbosa%2C+F">F. Barbosa</a>, <a href="/search/hep-ph?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/2012.13277">arXiv:2012.13277</a> <span> [<a href="https://arxiv.org/pdf/2012.13277">pdf</a>, <a href="https://arxiv.org/ps/2012.13277">ps</a>, <a href="https://arxiv.org/format/2012.13277">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.104.114013">10.1103/PhysRevD.104.114013 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> How large is the diffractive contribution to inclusive dijet photoproduction in UPCs at the LHC? </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Klasen%2C+M">M. Klasen</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="2012.13277v2-abstract-short" style="display: inline;"> Using next-to-leading order (NLO) perturbative QCD, we calculate the diffractive contribution to inclusive dijet photoproduction in Pb-Pb ultraperipheral collisions (UPCs) at the LHC and find that it does not exceed $5-10$% in small-$x_A$ bins in the ATLAS kinematics at $\sqrt{s_{NN}}=5.02$ TeV. Its smallness is a result of the restricted kinematics ($p_{T1} > 20$ GeV and $x_A > 0.001$), the large… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.13277v2-abstract-full').style.display = 'inline'; document.getElementById('2012.13277v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2012.13277v2-abstract-full" style="display: none;"> Using next-to-leading order (NLO) perturbative QCD, we calculate the diffractive contribution to inclusive dijet photoproduction in Pb-Pb ultraperipheral collisions (UPCs) at the LHC and find that it does not exceed $5-10$% in small-$x_A$ bins in the ATLAS kinematics at $\sqrt{s_{NN}}=5.02$ TeV. Its smallness is a result of the restricted kinematics ($p_{T1} > 20$ GeV and $x_A > 0.001$), the large nuclear suppression of nuclear diffractive parton distribution functions predicted in the leading twist model of nuclear shadowing, and additional suppression due to QCD factorization breaking in diffraction. At the same time, using looser $p_T$ cuts, e.g., $p_{T1} > 10$ GeV and $p_{T i\neq 1} > 5-7$ GeV, we find that $(d蟽_{\rm diff}/dx_A)/(d蟽_{\rm inc}/dx_A)$ can reach $10-20$% at $x \approx 5 \times 10^{-4}$. Also, applying our framework to proton-proton UPCs at $\sqrt{s_{NN}}=13$ TeV, we find that the ratio of the diffractive and inclusive cross sections of dijet photoproduction $(d蟽_{\rm diff}/dx_p)/(d蟽_{\rm inc}/dx_p)$ is as large as $10-15$% for $x_p \sim 5 \times 10^{-4}$. An account of the contribution of Pomeron-Pomeron scattering, which is not included in our analysis, should make this ratio somewhat larger. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.13277v2-abstract-full').style.display = 'none'; document.getElementById('2012.13277v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 December, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">14 pages, 2 figures, final revised version. Matches the published version, Phys. Rev. D 104, 114013 (2021)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MS-TP-20-46 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2010.00555">arXiv:2010.00555</a> <span> [<a href="https://arxiv.org/pdf/2010.00555">pdf</a>, <a href="https://arxiv.org/format/2010.00555">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.104.034010">10.1103/PhysRevD.104.034010 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nuclear parton distribution functions with uncertainties in a general mass variable flavor number scheme </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Khanpour%2C+H">Hamzeh Khanpour</a>, <a href="/search/hep-ph?searchtype=author&query=Soleymaninia%2C+M">Maryam Soleymaninia</a>, <a href="/search/hep-ph?searchtype=author&query=Tehrani%2C+S+A">S. Atashbar Tehrani</a>, <a href="/search/hep-ph?searchtype=author&query=Spiesberger%2C+H">Hubert Spiesberger</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">Vadim Guzey</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2010.00555v2-abstract-short" style="display: inline;"> In this article we obtain a new set of nuclear parton distribution functions (nuclear PDFs) at next-to-leading order and next-to-next-to-leading order accuracy in perturbative QCD. The common nuclear deep-inelastic scattering (DIS) data analyzed in our study are complemented by the available charged-current neutrino DIS data with nuclear targets and data from Drell-Yan cross-section measurements f… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.00555v2-abstract-full').style.display = 'inline'; document.getElementById('2010.00555v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2010.00555v2-abstract-full" style="display: none;"> In this article we obtain a new set of nuclear parton distribution functions (nuclear PDFs) at next-to-leading order and next-to-next-to-leading order accuracy in perturbative QCD. The common nuclear deep-inelastic scattering (DIS) data analyzed in our study are complemented by the available charged-current neutrino DIS data with nuclear targets and data from Drell-Yan cross-section measurements for several nuclear targets. In addition, the most recent DIS data from the Jefferson Lab CLAS and Hall C experiments are also added to our data sample. For these specific datasets, we consider the impact of target mass corrections and higher twist effects which are expected to be important in the region of large $x$ and intermediate-to-low $Q^2$. Our analysis is based on a publicly available open-source tool {\tt APFEL}, which has been modified to be applicable for our analysis of nuclear PDFs. Heavy quark contributions to nuclear DIS are considered within the framework of the {\tt FONLL} general-mass variable-flavor-number scheme. The most recent {\tt CT18} PDFs are used as baseline proton PDFs. The uncertainties of nuclear PDFs are determined using the standard Hessian approach. The results of our global QCD analysis are compared with existing nuclear PDF sets and with the fitted cross-sections, for which our set of nuclear PDFs provides a very good description. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.00555v2-abstract-full').style.display = 'none'; document.getElementById('2010.00555v2-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 1 October, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">34 Pages 9 Tables 19 Figs</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 104, 034010 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.03838">arXiv:2009.03838</a> <span> [<a href="https://arxiv.org/pdf/2009.03838">pdf</a>, <a href="https://arxiv.org/format/2009.03838">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> New opportunities at the photon energy frontier </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Adam%2C+J">Jaroslav Adam</a>, <a href="/search/hep-ph?searchtype=author&query=Aidala%2C+C">Christine Aidala</a>, <a href="/search/hep-ph?searchtype=author&query=Angerami%2C+A">Aaron Angerami</a>, <a href="/search/hep-ph?searchtype=author&query=Audurier%2C+B">Benjamin Audurier</a>, <a href="/search/hep-ph?searchtype=author&query=Bertulani%2C+C">Carlos Bertulani</a>, <a href="/search/hep-ph?searchtype=author&query=Bierlich%2C+C">Christian Bierlich</a>, <a href="/search/hep-ph?searchtype=author&query=Blok%2C+B">Boris Blok</a>, <a href="/search/hep-ph?searchtype=author&query=Brandenburg%2C+J+D">James Daniel Brandenburg</a>, <a href="/search/hep-ph?searchtype=author&query=Brodsky%2C+S">Stanley Brodsky</a>, <a href="/search/hep-ph?searchtype=author&query=Bylinkin%2C+A">Aleksandr Bylinkin</a>, <a href="/search/hep-ph?searchtype=author&query=Roman%2C+V+C">Veronica Canoa Roman</a>, <a href="/search/hep-ph?searchtype=author&query=Celiberto%2C+F+G">Francesco Giovanni Celiberto</a>, <a href="/search/hep-ph?searchtype=author&query=Cepila%2C+J">Jan Cepila</a>, <a href="/search/hep-ph?searchtype=author&query=Chachamis%2C+G">Grigorios Chachamis</a>, <a href="/search/hep-ph?searchtype=author&query=Cole%2C+B">Brian Cole</a>, <a href="/search/hep-ph?searchtype=author&query=Contreras%2C+G">Guillermo Contreras</a>, <a href="/search/hep-ph?searchtype=author&query=d%27Enterria%2C+D">David d'Enterria</a>, <a href="/search/hep-ph?searchtype=author&query=Dumitru%2C+A">Adrian Dumitru</a>, <a href="/search/hep-ph?searchtype=author&query=T%C3%A9llez%2C+A+F">Arturo Fern谩ndez T茅llez</a>, <a href="/search/hep-ph?searchtype=author&query=Frankfurt%2C+L">Leonid Frankfurt</a>, <a href="/search/hep-ph?searchtype=author&query=Ducati%2C+M+B+G">Maria Beatriz Gay Ducati</a>, <a href="/search/hep-ph?searchtype=author&query=Geurts%2C+F">Frank Geurts</a>, <a href="/search/hep-ph?searchtype=author&query=da+Silveira%2C+G+G">Gustavo Gil da Silveira</a>, <a href="/search/hep-ph?searchtype=author&query=Giuli%2C+F">Francesco Giuli</a>, <a href="/search/hep-ph?searchtype=author&query=Goncalves%2C+V+P">Victor P. Goncalves</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="2009.03838v1-abstract-short" style="display: inline;"> Ultra-peripheral collisions (UPCs) involving heavy ions and protons are the energy frontier for photon-mediated interactions. UPC photons can be used for many purposes, including probing low-$x$ gluons via photoproduction of dijets and vector mesons, probes of beyond-standard-model processes, such as those enabled by light-by-light scattering, and studies of two-photon production of the Higgs. </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.03838v1-abstract-full" style="display: none;"> Ultra-peripheral collisions (UPCs) involving heavy ions and protons are the energy frontier for photon-mediated interactions. UPC photons can be used for many purposes, including probing low-$x$ gluons via photoproduction of dijets and vector mesons, probes of beyond-standard-model processes, such as those enabled by light-by-light scattering, and studies of two-photon production of the Higgs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.03838v1-abstract-full').style.display = 'none'; document.getElementById('2009.03838v1-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 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Letter of Interest submitted to 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/2008.10891">arXiv:2008.10891</a> <span> [<a href="https://arxiv.org/pdf/2008.10891">pdf</a>, <a href="https://arxiv.org/ps/2008.10891">ps</a>, <a href="https://arxiv.org/format/2008.10891">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/10.1016/j.physletb.2021.136202">10.1016/j.physletb.2021.136202 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nuclear suppression from coherent $J/蠄$ photoproduction at the Large Hadron Collider </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Kryshen%2C+E">E. Kryshen</a>, <a href="/search/hep-ph?searchtype=author&query=Strikman%2C+M">M. Strikman</a>, <a href="/search/hep-ph?searchtype=author&query=Zhalov%2C+M">M. Zhalov</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="2008.10891v2-abstract-short" style="display: inline;"> Using the data on coherent $J/蠄$ photoproduction in Pb-Pb ultraperipheral collisions (UPCs) obtained in Runs 1 and 2 at the Large Hadron Collider (LHC), we determined with a good accuracy the nuclear suppression factor of $S_{Pb}(x)$ in a wide range of the momentum fraction $x$, $10^{-5} \leq x \leq 0.04$. In the small-$x$ region $x < 10^{-3}$, our $蠂^2$ fit favors a flat form of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2008.10891v2-abstract-full').style.display = 'inline'; document.getElementById('2008.10891v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2008.10891v2-abstract-full" style="display: none;"> Using the data on coherent $J/蠄$ photoproduction in Pb-Pb ultraperipheral collisions (UPCs) obtained in Runs 1 and 2 at the Large Hadron Collider (LHC), we determined with a good accuracy the nuclear suppression factor of $S_{Pb}(x)$ in a wide range of the momentum fraction $x$, $10^{-5} \leq x \leq 0.04$. In the small-$x$ region $x < 10^{-3}$, our $蠂^2$ fit favors a flat form of $S_{Pb}(x) \approx 0.6$ with approximately a 5% accuracy for $x=6 \times 10^{-4} - 10^{-3} $ and a 25% error at $x=10^{-4}$. At the same time, uncertainties of the fit do not exclude a slow decrease of $S_{Pb}(x)$ in the small-$x$ limit. At large $x$, $S_{Pb}(x)$ is constrained to better than 10% precision up to $x=0.04$ and is also consistent with the value of $S_{Pb}(x)$ at $\langle x \rangle =0.042$, which we extract from the Fermilab data on the $A$ dependence of the cross section of coherent $J/蠄$ photoproduction on fixed nuclear targets. The resulting uncertainties on $S_{Pb}(x)$ are small, which indicates the potential of the LHC data on coherent charmonium photoproduction in Pb-Pb UPCs to provide additional constraints on small-$x$ nPDFs. We explicitly demonstrate this using as an example the EPPS16 and nCTEQ16 nuclear parton distribution functions, whose uncertainties decrease severalfold after the Bayesian reweighting of the discussed UPC data. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2008.10891v2-abstract-full').style.display = 'none'; document.getElementById('2008.10891v2-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 February, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 August, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">18 pages, 3 figures, 3 tables. Revised and extended version including the Run 2 ALICE data at central rapidities and the effect of Bayesian reweighting of the UPC data on EPPS16 and nCTEQ15 nPDFs</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2007.14491">arXiv:2007.14491</a> <span> [<a href="https://arxiv.org/pdf/2007.14491">pdf</a>, <a href="https://arxiv.org/format/2007.14491">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> <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/10.1088/1361-6471/abf3ba">10.1088/1361-6471/abf3ba <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Large Hadron-Electron Collider at the HL-LHC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Agostini%2C+P">P. Agostini</a>, <a href="/search/hep-ph?searchtype=author&query=Aksakal%2C+H">H. Aksakal</a>, <a href="/search/hep-ph?searchtype=author&query=Alekhin%2C+S">S. Alekhin</a>, <a href="/search/hep-ph?searchtype=author&query=Allport%2C+P+P">P. P. Allport</a>, <a href="/search/hep-ph?searchtype=author&query=Andari%2C+N">N. Andari</a>, <a href="/search/hep-ph?searchtype=author&query=Andre%2C+K+D+J">K. D. J. Andre</a>, <a href="/search/hep-ph?searchtype=author&query=Angal-Kalinin%2C+D">D. Angal-Kalinin</a>, <a href="/search/hep-ph?searchtype=author&query=Antusch%2C+S">S. Antusch</a>, <a href="/search/hep-ph?searchtype=author&query=Bella%2C+L+A">L. Aperio Bella</a>, <a href="/search/hep-ph?searchtype=author&query=Apolinario%2C+L">L. Apolinario</a>, <a href="/search/hep-ph?searchtype=author&query=Apsimon%2C+R">R. Apsimon</a>, <a href="/search/hep-ph?searchtype=author&query=Apyan%2C+A">A. Apyan</a>, <a href="/search/hep-ph?searchtype=author&query=Arduini%2C+G">G. Arduini</a>, <a href="/search/hep-ph?searchtype=author&query=Ari%2C+V">V. Ari</a>, <a href="/search/hep-ph?searchtype=author&query=Armbruster%2C+A">A. Armbruster</a>, <a href="/search/hep-ph?searchtype=author&query=Armesto%2C+N">N. Armesto</a>, <a href="/search/hep-ph?searchtype=author&query=Auchmann%2C+B">B. Auchmann</a>, <a href="/search/hep-ph?searchtype=author&query=Aulenbacher%2C+K">K. Aulenbacher</a>, <a href="/search/hep-ph?searchtype=author&query=Azuelos%2C+G">G. Azuelos</a>, <a href="/search/hep-ph?searchtype=author&query=Backovic%2C+S">S. Backovic</a>, <a href="/search/hep-ph?searchtype=author&query=Bailey%2C+I">I. Bailey</a>, <a href="/search/hep-ph?searchtype=author&query=Bailey%2C+S">S. Bailey</a>, <a href="/search/hep-ph?searchtype=author&query=Balli%2C+F">F. Balli</a>, <a href="/search/hep-ph?searchtype=author&query=Behera%2C+S">S. Behera</a>, <a href="/search/hep-ph?searchtype=author&query=Behnke%2C+O">O. Behnke</a> , et al. (312 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="2007.14491v2-abstract-short" style="display: inline;"> The Large Hadron electron Collider (LHeC) is designed to move the field of deep inelastic scattering (DIS) to the energy and intensity frontier of particle physics. Exploiting energy recovery technology, it collides a novel, intense electron beam with a proton or ion beam from the High Luminosity--Large Hadron Collider (HL-LHC). The accelerator and interaction region are designed for concurrent el… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.14491v2-abstract-full').style.display = 'inline'; document.getElementById('2007.14491v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2007.14491v2-abstract-full" style="display: none;"> The Large Hadron electron Collider (LHeC) is designed to move the field of deep inelastic scattering (DIS) to the energy and intensity frontier of particle physics. Exploiting energy recovery technology, it collides a novel, intense electron beam with a proton or ion beam from the High Luminosity--Large Hadron Collider (HL-LHC). The accelerator and interaction region are designed for concurrent electron-proton and proton-proton operation. This report represents an update of the Conceptual Design Report (CDR) of the LHeC, published in 2012. It comprises new results on parton structure of the proton and heavier nuclei, QCD dynamics, electroweak and top-quark physics. It is shown how the LHeC will open a new chapter of nuclear particle physics in extending the accessible kinematic range in lepton-nucleus scattering by several orders of magnitude. Due to enhanced luminosity, large energy and the cleanliness of the hadronic final states, the LHeC has a strong Higgs physics programme and its own discovery potential for new physics. Building on the 2012 CDR, the report represents a detailed updated design of the energy recovery electron linac (ERL) including new lattice, magnet, superconducting radio frequency technology and further components. Challenges of energy recovery are described and the lower energy, high current, 3-turn ERL facility, PERLE at Orsay, is presented which uses the LHeC characteristics serving as a development facility for the design and operation of the LHeC. An updated detector design is presented corresponding to the acceptance, resolution and calibration goals which arise from the Higgs and parton density function physics programmes. The paper also presents novel results on the Future Circular Collider in electron-hadron mode, FCC-eh, which utilises the same ERL technology to further extend the reach of DIS to even higher centre-of-mass energies. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.14491v2-abstract-full').style.display = 'none'; document.getElementById('2007.14491v2-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 April, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 July, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">373 pages, many figures, to be published by J. Phys. G</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-ACC-Note-2020-0002 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J.Phys.G 48 (2021) 11, 110501 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2004.06972">arXiv:2004.06972</a> <span> [<a href="https://arxiv.org/pdf/2004.06972">pdf</a>, <a href="https://arxiv.org/format/2004.06972">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/JHEP05(2020)074">10.1007/JHEP05(2020)074 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Diffractive dijet photoproduction at the EIC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Klasen%2C+M">M. Klasen</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="2004.06972v1-abstract-short" style="display: inline;"> We present a first, detailed study of diffractive dijet photoproduction at the recently approved electron-ion collider (EIC) at BNL. Apart from establishing the kinematic reaches for various beam types, energies and kinematic cuts, we make precise predictions at next-to-leading order (NLO) of QCD in the most important kinematic variables. We show that the EIC will provide new and more precise info… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2004.06972v1-abstract-full').style.display = 'inline'; document.getElementById('2004.06972v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2004.06972v1-abstract-full" style="display: none;"> We present a first, detailed study of diffractive dijet photoproduction at the recently approved electron-ion collider (EIC) at BNL. Apart from establishing the kinematic reaches for various beam types, energies and kinematic cuts, we make precise predictions at next-to-leading order (NLO) of QCD in the most important kinematic variables. We show that the EIC will provide new and more precise information on the diffractive parton density functions (PDFs) in the pomeron than previously obtained at HERA, illuminate the still disputed mechanism of global vs.\ only resolved-photon factorization breaking, and provide access to a completely new quantity, i.e. nuclear diffractive PDFs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2004.06972v1-abstract-full').style.display = 'none'; document.getElementById('2004.06972v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 April, 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">20 pages, 10 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MS-TP-20-18 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2003.09129">arXiv:2003.09129</a> <span> [<a href="https://arxiv.org/pdf/2003.09129">pdf</a>, <a href="https://arxiv.org/ps/2003.09129">ps</a>, <a href="https://arxiv.org/format/2003.09129">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.102.065201">10.1103/PhysRevC.102.065201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Next-to-leading order QCD predictions for dijet photoproduction in lepton-nucleus scattering at the future EIC and at possible LHeC, HE-LHeC, and FCC facilities </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Klasen%2C+M">M. Klasen</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2003.09129v2-abstract-short" style="display: inline;"> We calculate cross sections for inclusive dijet photoproduction in electron-nucleus scattering in the kinematics of the future EIC and the possible LHeC, HE-LHeC, and the FCC using next-to-leading order (NLO) perturbative QCD and nCTEQ15 and EPPS16 nuclear parton density functions (nPDFs). We make predictions for distributions in the dijet average transverse momentum ${\bar p}_T$, the average rapi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2003.09129v2-abstract-full').style.display = 'inline'; document.getElementById('2003.09129v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2003.09129v2-abstract-full" style="display: none;"> We calculate cross sections for inclusive dijet photoproduction in electron-nucleus scattering in the kinematics of the future EIC and the possible LHeC, HE-LHeC, and the FCC using next-to-leading order (NLO) perturbative QCD and nCTEQ15 and EPPS16 nuclear parton density functions (nPDFs). We make predictions for distributions in the dijet average transverse momentum ${\bar p}_T$, the average rapidity $\bar畏$, the observed nuclear momentum fraction $x_A^{\rm obs}$, and the observed photon momentum fraction $x_纬^{\rm obs}$. Comparing the kinematic reaches of the four colliders, we find that an increase of the collision energy from the EIC to the LHeC and beyond extends the coverage in all four considered variables. Notably, the LHeC and HE-LHeC will allow one to probe the dijet cross section down to $x_A^{\rm obs} \sim 10^{-4}$ (down to $x_A^{\rm obs} \sim 10^{-5}$ at the FCC). The ratio of the dijet cross sections on a nucleus and the proton, $蟽_A/(A蟽_p)$, depends on $x_A^{\rm obs}$ in a similar way as the ratio of gluon densities, $g_A(x_A,渭^2)/[A g_p(x_A,渭^2)]$, for which current nPDFs predict a strong suppression due to nuclear shadowing in the region $x_A^{\rm obs} < 0.01$. Dijet photoproduction at future lepton-nucleus colliders can therefore be used to test this prediction and considerably reduce the current uncertainties of nPDFs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2003.09129v2-abstract-full').style.display = 'none'; document.getElementById('2003.09129v2-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 December, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 March, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 5 figures. Final published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MS-TP-20-14 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 102, 065201 (2020) </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/hep-ph?searchtype=author&query=Aidala%2C+C+A">Christine A. Aidala</a>, <a href="/search/hep-ph?searchtype=author&query=Aschenauer%2C+E">Elke Aschenauer</a>, <a href="/search/hep-ph?searchtype=author&query=Aslan%2C+F">Fatma Aslan</a>, <a href="/search/hep-ph?searchtype=author&query=Bacchetta%2C+A">Alessandro Bacchetta</a>, <a href="/search/hep-ph?searchtype=author&query=Balitsky%2C+I">Ian Balitsky</a>, <a href="/search/hep-ph?searchtype=author&query=Benic%2C+S">Sanjin Benic</a>, <a href="/search/hep-ph?searchtype=author&query=Bhattacharya%2C+S">Shohini Bhattacharya</a>, <a href="/search/hep-ph?searchtype=author&query=Boglione%2C+M">Mariaelena Boglione</a>, <a href="/search/hep-ph?searchtype=author&query=Burkardt%2C+M">Matthias Burkardt</a>, <a href="/search/hep-ph?searchtype=author&query=Cammarota%2C+J">Justin Cammarota</a>, <a href="/search/hep-ph?searchtype=author&query=Chirilli%2C+G+A">Giovanni A. Chirilli</a>, <a href="/search/hep-ph?searchtype=author&query=Cocuzza%2C+C">Christopher Cocuzza</a>, <a href="/search/hep-ph?searchtype=author&query=Courtoy%2C+A">Aurore Courtoy</a>, <a href="/search/hep-ph?searchtype=author&query=de+Florian%2C+D">Daniel de Florian</a>, <a href="/search/hep-ph?searchtype=author&query=Di+Nezza%2C+P">Pasquale Di Nezza</a>, <a href="/search/hep-ph?searchtype=author&query=Dumitru%2C+A">Adrian Dumitru</a>, <a href="/search/hep-ph?searchtype=author&query=Fucini%2C+S">Sara Fucini</a>, <a href="/search/hep-ph?searchtype=author&query=Fukushima%2C+K">Kenji Fukushima</a>, <a href="/search/hep-ph?searchtype=author&query=Furletova%2C+Y">Yulia Furletova</a>, <a href="/search/hep-ph?searchtype=author&query=Gamberg%2C+L">Leonard Gamberg</a>, <a href="/search/hep-ph?searchtype=author&query=Garcia-Montero%2C+O">Oscar Garcia-Montero</a>, <a href="/search/hep-ph?searchtype=author&query=Gelis%2C+F">Fran莽ois Gelis</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">Vadim Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Hatta%2C+Y">Yoshitaka Hatta</a>, <a href="/search/hep-ph?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/2002.09683">arXiv:2002.09683</a> <span> [<a href="https://arxiv.org/pdf/2002.09683">pdf</a>, <a href="https://arxiv.org/ps/2002.09683">ps</a>, <a href="https://arxiv.org/format/2002.09683">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.102.015208">10.1103/PhysRevC.102.015208 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Incoherent $蟻$ meson photoproduction in ultraperipheral nuclear collisions at the LHC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Kryshen%2C+E">E. Kryshen</a>, <a href="/search/hep-ph?searchtype=author&query=Zhalov%2C+M">M. Zhalov</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2002.09683v2-abstract-short" style="display: inline;"> Using the Gribov-Glauber model for photon-nucleus scattering and a generalization of the vector meson dominance model for the hadronic structure of the photon, we make predictions for the cross section of incoherent $蟻$ photoproduction in Pb-Pb ultraperipheral collisions (UPCs) in the Large Hadron Collider kinematics. We find that the effect of the inelastic nuclear shadowing is significant and le… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.09683v2-abstract-full').style.display = 'inline'; document.getElementById('2002.09683v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2002.09683v2-abstract-full" style="display: none;"> Using the Gribov-Glauber model for photon-nucleus scattering and a generalization of the vector meson dominance model for the hadronic structure of the photon, we make predictions for the cross section of incoherent $蟻$ photoproduction in Pb-Pb ultraperipheral collisions (UPCs) in the Large Hadron Collider kinematics. We find that the effect of the inelastic nuclear shadowing is significant and leads to an additional 25% suppression of the incoherent cross section. Comparing our predictions to those of the STARlight Monte Carlo framework, we observe very significant differences. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.09683v2-abstract-full').style.display = 'none'; document.getElementById('2002.09683v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 August, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 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">10 pages, 6 figures, 1 table. Final published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 102, 015208 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1909.08954">arXiv:1909.08954</a> <span> [<a href="https://arxiv.org/pdf/1909.08954">pdf</a>, <a href="https://arxiv.org/format/1909.08954">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"> Inclusive and diffractive dijet photoproduction in UPCs at the LHC in NLO QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Klasen%2C+M">M. Klasen</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="1909.08954v1-abstract-short" style="display: inline;"> We present a next-to-leading order QCD calculation of inclusive dijet photoproduction in ultraperipheral Pb-Pb collisions at the LHC and show that the results agree very well with various kinematic distributions measured by the ATLAS collaboration. The effect of including these data in nCTEQ or EPPS16 nuclear parton density functions (nPDFs) is then studied using the Bayesian reweighting technique… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.08954v1-abstract-full').style.display = 'inline'; document.getElementById('1909.08954v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1909.08954v1-abstract-full" style="display: none;"> We present a next-to-leading order QCD calculation of inclusive dijet photoproduction in ultraperipheral Pb-Pb collisions at the LHC and show that the results agree very well with various kinematic distributions measured by the ATLAS collaboration. The effect of including these data in nCTEQ or EPPS16 nuclear parton density functions (nPDFs) is then studied using the Bayesian reweighting technique. For an assumed total error of 5\% on the final data, its inclusion would lead to a significant reduction of the nPDF uncertainties of up to a factor of two at small values of the parton momentum fraction. As an outlook, we discuss future analyes of diffractive nPDFs, which are so far completely unknown. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.08954v1-abstract-full').style.display = 'none'; document.getElementById('1909.08954v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 5 figures, 1 table. Proceedings of the EPS Conference on High-Energy Physics (EPS-HEP 2019), Ghent, Belgium</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MS-TP-19-25 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1902.05126">arXiv:1902.05126</a> <span> [<a href="https://arxiv.org/pdf/1902.05126">pdf</a>, <a href="https://arxiv.org/ps/1902.05126">ps</a>, <a href="https://arxiv.org/format/1902.05126">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/s10052-019-6905-2">10.1140/epjc/s10052-019-6905-2 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Constraints on nuclear parton distributions from dijet photoproduction at the LHC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Klasen%2C+M">M. Klasen</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="1902.05126v2-abstract-short" style="display: inline;"> Using QCD calculations of the cross section of inclusive dijet photoproduction in Pb-Pb ultraperipheral collisions in the LHC kinematics as pseudo-data, we study the effect of including these data using the Bayesian reweighting technique on nCTEQ15, nCTEQ15np, and EPPS16 nuclear parton distribution functions (nPDFs). We find that, depending on the assumed error of the pseudo-data, it leads to a si… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1902.05126v2-abstract-full').style.display = 'inline'; document.getElementById('1902.05126v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1902.05126v2-abstract-full" style="display: none;"> Using QCD calculations of the cross section of inclusive dijet photoproduction in Pb-Pb ultraperipheral collisions in the LHC kinematics as pseudo-data, we study the effect of including these data using the Bayesian reweighting technique on nCTEQ15, nCTEQ15np, and EPPS16 nuclear parton distribution functions (nPDFs). We find that, depending on the assumed error of the pseudo-data, it leads to a significant reduction of the nPDF uncertainties at small values of the momentum fraction $x_A$. Taking the error to be 5\%, the uncertainty of nCTEQ15 and nCTEQ15np nPDFs reduces approximately by a factor of two at $x_A=10^{-3}$. At the same time, the reweighting effect on EPPS16 nPDFs is much smaller due to the higher value of the tolerance and a more flexible parametrization form. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1902.05126v2-abstract-full').style.display = 'none'; document.getElementById('1902.05126v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 February, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">16 pages, 11 figures. Final published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MS-TP-19-03 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1812.08166">arXiv:1812.08166</a> <span> [<a href="https://arxiv.org/pdf/1812.08166">pdf</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/10.23727/CERN-Proceedings-2018-001.1">10.23727/CERN-Proceedings-2018-001.1 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> PHOTON-2017 conference proceedings </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=d%27Enterria%2C+D">David d'Enterria</a>, <a href="/search/hep-ph?searchtype=author&query=de+Roeck%2C+A">Albert de Roeck</a>, <a href="/search/hep-ph?searchtype=author&query=Mangano%2C+M">Michelangelo Mangano</a>, <a href="/search/hep-ph?searchtype=author&query=Adam%2C+J">Jaroslav Adam</a>, <a href="/search/hep-ph?searchtype=author&query=Alvioli%2C+M">Massimiliano Alvioli</a>, <a href="/search/hep-ph?searchtype=author&query=Anson%2C+C+D">Christopher D. Anson</a>, <a href="/search/hep-ph?searchtype=author&query=Bakhshiansohi%2C+H">Hamed Bakhshiansohi</a>, <a href="/search/hep-ph?searchtype=author&query=Baldenegro%2C+C">Cristian Baldenegro</a>, <a href="/search/hep-ph?searchtype=author&query=Bertone%2C+V">Valerio Bertone</a>, <a href="/search/hep-ph?searchtype=author&query=Brodsky%2C+S+J">Stanley J. Brodsky</a>, <a href="/search/hep-ph?searchtype=author&query=Bussey%2C+P+J">Peter J. Bussey</a>, <a href="/search/hep-ph?searchtype=author&query=Chau%2C+C+C">Chav Chhiv Chau</a>, <a href="/search/hep-ph?searchtype=author&query=Chou%2C+W">Weiren Chou</a>, <a href="/search/hep-ph?searchtype=author&query=Chudasama%2C+R">Ruchi Chudasama</a>, <a href="/search/hep-ph?searchtype=author&query=Cornet%2C+F">Fernando Cornet</a>, <a href="/search/hep-ph?searchtype=author&query=d%27Enterria%2C+D">David d'Enterria</a>, <a href="/search/hep-ph?searchtype=author&query=Dittmaier%2C+S">Stefan Dittmaier</a>, <a href="/search/hep-ph?searchtype=author&query=Dobrich%2C+B">Babette Dobrich</a>, <a href="/search/hep-ph?searchtype=author&query=Dutta%2C+D">Dipanwita Dutta</a>, <a href="/search/hep-ph?searchtype=author&query=Ellis%2C+J">John Ellis</a>, <a href="/search/hep-ph?searchtype=author&query=Fichet%2C+S">Sylvain Fichet</a>, <a href="/search/hep-ph?searchtype=author&query=Frankfurt%2C+L">Leonid Frankfurt</a>, <a href="/search/hep-ph?searchtype=author&query=Garcia-Canal%2C+C">Carlos Garcia-Canal</a>, <a href="/search/hep-ph?searchtype=author&query=Godbole%2C+R+M">Rohini M. Godbole</a>, <a href="/search/hep-ph?searchtype=author&query=Grau%2C+A">Agnes Grau</a> , et al. (56 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1812.08166v1-abstract-short" style="display: inline;"> This document collects the proceedings of the PHOTON 2017 conference ("International Conference on the Structure and the Interactions of the Photon", including the 22th "International Workshop on Photon-Photon Collisions", and the "International Workshop on High Energy Photon Colliders") held at CERN (Geneva) in May 2017. The latest experimental and theoretical developments on the topics of the PH… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.08166v1-abstract-full').style.display = 'inline'; document.getElementById('1812.08166v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1812.08166v1-abstract-full" style="display: none;"> This document collects the proceedings of the PHOTON 2017 conference ("International Conference on the Structure and the Interactions of the Photon", including the 22th "International Workshop on Photon-Photon Collisions", and the "International Workshop on High Energy Photon Colliders") held at CERN (Geneva) in May 2017. The latest experimental and theoretical developments on the topics of the PHOTON conference series are covered: (i) $纬\,纬$ processes in e$^+$e$^-$, proton-proton (pp) and nucleus-nucleus (AA) collisions at current and future colliders, (ii) $纬$-hadron interactions in e$^\pm$p, pp, and AA collisions, (iii) final-state photon production (including Standard Model studies and searches beyond it) in pp and AA collisions, and (iv) high-energy $纬$-ray astrophysics. These proceedings are dedicated to the memory of Maria Krawczyk. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.08166v1-abstract-full').style.display = 'none'; document.getElementById('1812.08166v1-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 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">296 pages. CERN-Proceedings-2018-001 (CERN, Geneva, 2018), to appear. arXiv admin note: substantial text overlap with arXiv:1804.05614, arXiv:1708.06683, arXiv:1709.09044, arXiv:1708.00912, arXiv:1708.07173, arXiv:1709.02985, arXiv:1709.00176, arXiv:1709.05167, arXiv:1708.05756, arXiv:1708.09759, arXiv:1708.07531, arXiv:1703.08450, arXiv:1711.02551, arXiv:1511.07794, arXiv:1712.10104, arXiv:1708.05776, arXiv:1712.10202, arXiv:1709.07110, arXiv:1702.08730, arXiv:1709.02648, arXiv:1411.6397</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1812.06772">arXiv:1812.06772</a> <span> [<a href="https://arxiv.org/pdf/1812.06772">pdf</a>, <a href="https://arxiv.org/format/1812.06772">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> <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"> Future physics opportunities for high-density QCD at the LHC with heavy-ion and proton beams </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Citron%2C+Z">Z. Citron</a>, <a href="/search/hep-ph?searchtype=author&query=Dainese%2C+A">A. Dainese</a>, <a href="/search/hep-ph?searchtype=author&query=Grosse-Oetringhaus%2C+J+F">J. F. Grosse-Oetringhaus</a>, <a href="/search/hep-ph?searchtype=author&query=Jowett%2C+J+M">J. M. Jowett</a>, <a href="/search/hep-ph?searchtype=author&query=Lee%2C+Y+-">Y. -J. Lee</a>, <a href="/search/hep-ph?searchtype=author&query=Wiedemann%2C+U+A">U. A. Wiedemann</a>, <a href="/search/hep-ph?searchtype=author&query=Winn%2C+M">M. Winn</a>, <a href="/search/hep-ph?searchtype=author&query=Andronic%2C+A">A. Andronic</a>, <a href="/search/hep-ph?searchtype=author&query=Bellini%2C+F">F. Bellini</a>, <a href="/search/hep-ph?searchtype=author&query=Bruna%2C+E">E. Bruna</a>, <a href="/search/hep-ph?searchtype=author&query=Chapon%2C+E">E. Chapon</a>, <a href="/search/hep-ph?searchtype=author&query=Dembinski%2C+H">H. Dembinski</a>, <a href="/search/hep-ph?searchtype=author&query=d%27Enterria%2C+D">D. d'Enterria</a>, <a href="/search/hep-ph?searchtype=author&query=Grabowska-Bold%2C+I">I. Grabowska-Bold</a>, <a href="/search/hep-ph?searchtype=author&query=Innocenti%2C+G+M">G. M. Innocenti</a>, <a href="/search/hep-ph?searchtype=author&query=Loizides%2C+C">C. Loizides</a>, <a href="/search/hep-ph?searchtype=author&query=Mohapatra%2C+S">S. Mohapatra</a>, <a href="/search/hep-ph?searchtype=author&query=Salgado%2C+C+A">C. A. Salgado</a>, <a href="/search/hep-ph?searchtype=author&query=Verweij%2C+M">M. Verweij</a>, <a href="/search/hep-ph?searchtype=author&query=Weber%2C+M">M. Weber</a>, <a href="/search/hep-ph?searchtype=author&query=Aichelin%2C+J">J. Aichelin</a>, <a href="/search/hep-ph?searchtype=author&query=Angerami%2C+A">A. Angerami</a>, <a href="/search/hep-ph?searchtype=author&query=Apolinario%2C+L">L. Apolinario</a>, <a href="/search/hep-ph?searchtype=author&query=Arleo%2C+F">F. Arleo</a>, <a href="/search/hep-ph?searchtype=author&query=Armesto%2C+N">N. Armesto</a> , et al. (160 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1812.06772v2-abstract-short" style="display: inline;"> The future opportunities for high-density QCD studies with ion and proton beams at the LHC are presented. Four major scientific goals are identified: the characterisation of the macroscopic long wavelength Quark-Gluon Plasma (QGP) properties with unprecedented precision, the investigation of the microscopic parton dynamics underlying QGP properties, the development of a unified picture of particle… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.06772v2-abstract-full').style.display = 'inline'; document.getElementById('1812.06772v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1812.06772v2-abstract-full" style="display: none;"> The future opportunities for high-density QCD studies with ion and proton beams at the LHC are presented. Four major scientific goals are identified: the characterisation of the macroscopic long wavelength Quark-Gluon Plasma (QGP) properties with unprecedented precision, the investigation of the microscopic parton dynamics underlying QGP properties, the development of a unified picture of particle production and QCD dynamics from small (pp) to large (nucleus--nucleus) systems, the exploration of parton densities in nuclei in a broad ($x$, $Q^2$) kinematic range and the search for the possible onset of parton saturation. In order to address these scientific goals, high-luminosity Pb-Pb and p-Pb programmes are considered as priorities for Runs 3 and 4, complemented by high-multiplicity studies in pp collisions and a short run with oxygen ions. High-luminosity runs with intermediate-mass nuclei, for example Ar or Kr, are considered as an appealing case for extending the heavy-ion programme at the LHC beyond Run 4. The potential of the High-Energy LHC to probe QCD matter with newly-available observables, at twice larger center-of-mass energies than the LHC, is investigated. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.06772v2-abstract-full').style.display = 'none'; document.getElementById('1812.06772v2-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 February, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">209 pages; Report from Working Group 5 of the Workshop on the Physics of the CERN HL-LHC, and Perspectives at the HE-LHC (v2: Minor updates to text and figures. Added one author.)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-LPCC-2018-07 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1811.10236">arXiv:1811.10236</a> <span> [<a href="https://arxiv.org/pdf/1811.10236">pdf</a>, <a href="https://arxiv.org/ps/1811.10236">ps</a>, <a href="https://arxiv.org/format/1811.10236">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> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.99.065202">10.1103/PhysRevC.99.065202 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Inclusive dijet photoproduction in ultraperipheral heavy-ion collisions at the CERN LHC in next-to-leading order QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Klasen%2C+M">M. Klasen</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1811.10236v2-abstract-short" style="display: inline;"> We compute the cross section of inclusive dijet photoproduction in ultraperipheral Pb-Pb collisions at the LHC using next-to-leading order perturbative QCD. We demonstrate that our theoretical calculations provide a good description of various kinematic distributions measured by the ATLAS collaboration. We find that the calculated dijet photoproduction cross section is sensitive to nuclear modific… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.10236v2-abstract-full').style.display = 'inline'; document.getElementById('1811.10236v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1811.10236v2-abstract-full" style="display: none;"> We compute the cross section of inclusive dijet photoproduction in ultraperipheral Pb-Pb collisions at the LHC using next-to-leading order perturbative QCD. We demonstrate that our theoretical calculations provide a good description of various kinematic distributions measured by the ATLAS collaboration. We find that the calculated dijet photoproduction cross section is sensitive to nuclear modifications of parton distribution functions (PDFs) at the level of 10 to 20%. Hence, this process can be used to reduce uncertainties in the determination of these nuclear PDFs, whose current magnitude is comparable to the size of the calculated nuclear modifications of the dijet photoproduction cross section. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.10236v2-abstract-full').style.display = 'none'; document.getElementById('1811.10236v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 July, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 November, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 7 figures. Matches the final published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MS-TP-18-30 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 99, 065202 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1808.00740">arXiv:1808.00740</a> <span> [<a href="https://arxiv.org/pdf/1808.00740">pdf</a>, <a href="https://arxiv.org/ps/1808.00740">ps</a>, <a href="https://arxiv.org/format/1808.00740">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> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.99.015201">10.1103/PhysRevC.99.015201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nucleon dissociation and incoherent $J/蠄$ photoproduction on nuclei in ion ultraperipheral collisions at the CERN Large Hadron Collider </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Strikman%2C+M">M. Strikman</a>, <a href="/search/hep-ph?searchtype=author&query=Zhalov%2C+M">M. Zhalov</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="1808.00740v2-abstract-short" style="display: inline;"> Using the general notion of cross section fluctuations in hadron--nucleus scattering at high energies, we derive an expression for the cross section of incoherent $J/蠄$ photoproduction on heavy nuclei $d蟽_{纬A \to J/蠄Y}/dt$, which includes both elastic $d蟽_{纬p \to J/蠄p}/dt$ and proton-dissociation $d蟽_{纬p \to J/蠄Y}/dt$ photoproduction on target nucleons. We find that with good accuracy,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.00740v2-abstract-full').style.display = 'inline'; document.getElementById('1808.00740v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1808.00740v2-abstract-full" style="display: none;"> Using the general notion of cross section fluctuations in hadron--nucleus scattering at high energies, we derive an expression for the cross section of incoherent $J/蠄$ photoproduction on heavy nuclei $d蟽_{纬A \to J/蠄Y}/dt$, which includes both elastic $d蟽_{纬p \to J/蠄p}/dt$ and proton-dissociation $d蟽_{纬p \to J/蠄Y}/dt$ photoproduction on target nucleons. We find that with good accuracy, $d蟽_{纬A \to J/蠄Y}/dt$ can be expressed as a product of the sum of the $d蟽_{纬p \to J/蠄p}/dt$ and $d蟽_{纬p \to J/蠄Y}/dt$ cross sections, which have been measured at HERA, and the common nuclear shadowing factor, which is calculated using the leading twist nuclear shadowing model. Our prediction for the cross section of incoherent $J/蠄$ photoproduction in Pb-Pb UPCs at $\sqrt{s_{NN}}=2.76$ TeV and $y=0$, $d蟽_{AA \to J/蠄AY}(y=0)/dy=0.59-1.24$ mb, agrees within significant theoretical uncertainties with the data of the ALICE collaboration. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.00740v2-abstract-full').style.display = 'none'; document.getElementById('1808.00740v2-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, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 August, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 2 figures. Final published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 99, 015201 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1803.07638">arXiv:1803.07638</a> <span> [<a href="https://arxiv.org/pdf/1803.07638">pdf</a>, <a href="https://arxiv.org/ps/1803.07638">ps</a>, <a href="https://arxiv.org/format/1803.07638">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="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.2018.05.058">10.1016/j.physletb.2018.05.058 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Photoproduction of light vector mesons in Xe-Xe ultraperipheral collisions at the LHC and the nuclear density of Xe-129 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Kryshen%2C+E">E. Kryshen</a>, <a href="/search/hep-ph?searchtype=author&query=Zhalov%2C+M">M. Zhalov</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1803.07638v2-abstract-short" style="display: inline;"> We make predictions for cross sections of $蟻$ and $蠁$ vector meson photoproduction in ultraperipheral Xe-Xe collisions at $\sqrt{s_{NN}}=5.44$ TeV. Analyzing the momentum transfer distribution of $蟻$ mesons in this process, we explore the feasibility of extracting the nuclear density of $^{129}$Xe, which is needed in searches for dark matter with Xenon-based detectors. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1803.07638v2-abstract-full" style="display: none;"> We make predictions for cross sections of $蟻$ and $蠁$ vector meson photoproduction in ultraperipheral Xe-Xe collisions at $\sqrt{s_{NN}}=5.44$ TeV. Analyzing the momentum transfer distribution of $蟻$ mesons in this process, we explore the feasibility of extracting the nuclear density of $^{129}$Xe, which is needed in searches for dark matter with Xenon-based detectors. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1803.07638v2-abstract-full').style.display = 'none'; document.getElementById('1803.07638v2-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 May, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 March, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 4 figures. Final published version</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1802.01363">arXiv:1802.01363</a> <span> [<a href="https://arxiv.org/pdf/1802.01363">pdf</a>, <a href="https://arxiv.org/format/1802.01363">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/10.1140/epjc/s10052-018-5787-z">10.1140/epjc/s10052-018-5787-z <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First global next-to-leading order determination of diffractive parton distribution functions and their uncertainties within the {\tt xFitter} framework </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Goharipour%2C+M">Muhammad Goharipour</a>, <a href="/search/hep-ph?searchtype=author&query=Khanpour%2C+H">Hamzeh Khanpour</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">Vadim Guzey</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="1802.01363v2-abstract-short" style="display: inline;"> We present {\tt GKG18-DPDFs}, a next-to-leading order (NLO) QCD analysis of diffractive parton distribution functions (diffractive PDFs) and their uncertainties. This is the first global set of diffractive PDFs determined within the {\tt xFitter} framework. This analysis is motivated by all available and most up-to-date data on inclusive diffractive deep inelastic scattering (diffractive DIS). Hea… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.01363v2-abstract-full').style.display = 'inline'; document.getElementById('1802.01363v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1802.01363v2-abstract-full" style="display: none;"> We present {\tt GKG18-DPDFs}, a next-to-leading order (NLO) QCD analysis of diffractive parton distribution functions (diffractive PDFs) and their uncertainties. This is the first global set of diffractive PDFs determined within the {\tt xFitter} framework. This analysis is motivated by all available and most up-to-date data on inclusive diffractive deep inelastic scattering (diffractive DIS). Heavy quark contributions are considered within the framework of the Thorne-Roberts (TR) general mass variable flavor number scheme (GM-VFNS). We form a mutually consistent set of diffractive PDFs due to the inclusion of high-precision data from H1/ZEUS combined inclusive diffractive cross sections measurements. We study the impact of the H1/ZEUS combined data by producing a variety of determinations based on reduced data sets. We find that these data sets have a significant impact on the diffractive PDFs with some substantial reductions in uncertainties. The predictions based on the extracted diffractive PDFs are compared to the analyzed diffractive DIS data and with other determinations of the diffractive PDFs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.01363v2-abstract-full').style.display = 'none'; document.getElementById('1802.01363v2-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 April, 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">36 pages, 14 Figures and 4 Tables, version to appear in European Physical Journal C</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur.Phys.J. C78 (2018) 309 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1712.04198">arXiv:1712.04198</a> <span> [<a href="https://arxiv.org/pdf/1712.04198">pdf</a>, <a href="https://arxiv.org/format/1712.04198">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.5506/APhysPolB.49.741">10.5506/APhysPolB.49.741 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nucleon and nuclear structure through dilepton production </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Anikin%2C+I+V">I. V. Anikin</a>, <a href="/search/hep-ph?searchtype=author&query=Batzell%2C+N">N. Batzell</a>, <a href="/search/hep-ph?searchtype=author&query=Boer%2C+M">M. Boer</a>, <a href="/search/hep-ph?searchtype=author&query=Boussarie%2C+R">R. Boussarie</a>, <a href="/search/hep-ph?searchtype=author&query=Braun%2C+V+M">V. M. Braun</a>, <a href="/search/hep-ph?searchtype=author&query=Brodsky%2C+S+J">S. J. Brodsky</a>, <a href="/search/hep-ph?searchtype=author&query=Camsonne%2C+A">A. Camsonne</a>, <a href="/search/hep-ph?searchtype=author&query=Chang%2C+W+C">W. C. Chang</a>, <a href="/search/hep-ph?searchtype=author&query=Colaneri%2C+L">L. Colaneri</a>, <a href="/search/hep-ph?searchtype=author&query=Dobbs%2C+S">S. Dobbs</a>, <a href="/search/hep-ph?searchtype=author&query=Efremov%2C+A+V">A. V. Efremov</a>, <a href="/search/hep-ph?searchtype=author&query=Gnanvo%2C+K">K. Gnanvo</a>, <a href="/search/hep-ph?searchtype=author&query=Gryniuk%2C+O">O. Gryniuk</a>, <a href="/search/hep-ph?searchtype=author&query=Guidal%2C+M">M. Guidal</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Hyde%2C+C+E">C. E. Hyde</a>, <a href="/search/hep-ph?searchtype=author&query=Ilieva%2C+Y">Y. Ilieva</a>, <a href="/search/hep-ph?searchtype=author&query=Joosten%2C+S">S. Joosten</a>, <a href="/search/hep-ph?searchtype=author&query=Kroll%2C+P">P. Kroll</a>, <a href="/search/hep-ph?searchtype=author&query=Kumericki%2C+K">K. Kumericki</a>, <a href="/search/hep-ph?searchtype=author&query=Meziani%2C+Z+-">Z. -E. Meziani</a>, <a href="/search/hep-ph?searchtype=author&query=M%C3%BCller%2C+D">D. M眉ller</a>, <a href="/search/hep-ph?searchtype=author&query=Semenov-Tian-Shansky%2C+K+M">K. M. Semenov-Tian-Shansky</a>, <a href="/search/hep-ph?searchtype=author&query=Stepanyan%2C+S">S. Stepanyan</a>, <a href="/search/hep-ph?searchtype=author&query=Szymanowski%2C+L">L. Szymanowski</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="1712.04198v2-abstract-short" style="display: inline;"> Transverse momentum distributions and generalized parton distributions provide a comprehensive framework for the three-dimensional imaging of the nucleon and the nucleus experimentally using deeply virtual semi-exclusive and exclusive processes. The advent of combined high luminosity facilities and large acceptance detector capabilities enables experimental investigation of the partonic structure… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.04198v2-abstract-full').style.display = 'inline'; document.getElementById('1712.04198v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1712.04198v2-abstract-full" style="display: none;"> Transverse momentum distributions and generalized parton distributions provide a comprehensive framework for the three-dimensional imaging of the nucleon and the nucleus experimentally using deeply virtual semi-exclusive and exclusive processes. The advent of combined high luminosity facilities and large acceptance detector capabilities enables experimental investigation of the partonic structure of hadrons with time-like virtual probes, in complement to the rich on-going space-like virtual probe program. The merits and benefits of the dilepton production channel for nuclear structure studies are discussed within the context of the International Workshop on Nucleon and Nuclear Structure through Dilepton Production taking place at the European Center for Theoretical Studies in Nuclear Physics and Related Areas (ECT$^{\star}$) of Trento. Particularly, the double deeply virtual Compton scattering, the time-like Compton scattering, the deeply virtual meson production, and the Drell-Yan processes are reviewed and a strategy for high impact experimental measurements is proposed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.04198v2-abstract-full').style.display = 'none'; document.getElementById('1712.04198v2-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 May, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 December, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">21 pages, 23 figures, Conference proceedings</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Acta Physica Polonica 49 (2018) 741 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1708.05740">arXiv:1708.05740</a> <span> [<a href="https://arxiv.org/pdf/1708.05740">pdf</a>, <a href="https://arxiv.org/ps/1708.05740">ps</a>, <a href="https://arxiv.org/format/1708.05740">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/10.1140/epjc/s10052-017-5490-5">10.1140/epjc/s10052-017-5490-5 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Effects of next-to-leading order DGLAP evolution on generalized parton distributions of the proton and deeply virtual Compton scattering at high energy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Khanpour%2C+H">Hamzeh Khanpour</a>, <a href="/search/hep-ph?searchtype=author&query=Goharipour%2C+M">Muhammad Goharipour</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">Vadim Guzey</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="1708.05740v2-abstract-short" style="display: inline;"> We studied the effects of NLO $Q^2$ evolution of generalized parton distributions (GPDs) using the aligned-jet model for the singlet quark and gluon GPDs at an initial evolution scale. We found that the skewness ratio for quarks is a slow logarithmic function of $Q^2$ reaching $r^S=1.5-2$ at $Q^2=100$ GeV$^2$ and $r^g \approx 1$ for gluons in a wide range of $Q^2$. Using the resulting GPDs, we cal… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1708.05740v2-abstract-full').style.display = 'inline'; document.getElementById('1708.05740v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1708.05740v2-abstract-full" style="display: none;"> We studied the effects of NLO $Q^2$ evolution of generalized parton distributions (GPDs) using the aligned-jet model for the singlet quark and gluon GPDs at an initial evolution scale. We found that the skewness ratio for quarks is a slow logarithmic function of $Q^2$ reaching $r^S=1.5-2$ at $Q^2=100$ GeV$^2$ and $r^g \approx 1$ for gluons in a wide range of $Q^2$. Using the resulting GPDs, we calculated the DVCS cross section on the proton in NLO pQCD and found that this model in conjunction with modern parameterizations of proton PDFs (CJ15 and CT14) provides a good description of the available H1 and ZEUS data in a wide kinematic range. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1708.05740v2-abstract-full').style.display = 'none'; document.getElementById('1708.05740v2-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, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 August, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 10 figures. Matches the published version</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1612.08273">arXiv:1612.08273</a> <span> [<a href="https://arxiv.org/pdf/1612.08273">pdf</a>, <a href="https://arxiv.org/ps/1612.08273">ps</a>, <a href="https://arxiv.org/format/1612.08273">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/PhysRevC.95.055208">10.1103/PhysRevC.95.055208 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Dynamical model of antishadowing of the nuclear gluon distribution </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Frankfurt%2C+L">L. Frankfurt</a>, <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Strikman%2C+M">M. Strikman</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="1612.08273v2-abstract-short" style="display: inline;"> We explore the theoretical observation that within the leading twist approximation, the nuclear effects of shadowing and antishadowing in non-perturbative nuclear parton distribution functions (nPDFs) at the input QCD evolution scale involve diffraction on nucleons of a nuclear target and originate from merging of two parton ladders belonging to two different nucleons, which are close in the rapid… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1612.08273v2-abstract-full').style.display = 'inline'; document.getElementById('1612.08273v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1612.08273v2-abstract-full" style="display: none;"> We explore the theoretical observation that within the leading twist approximation, the nuclear effects of shadowing and antishadowing in non-perturbative nuclear parton distribution functions (nPDFs) at the input QCD evolution scale involve diffraction on nucleons of a nuclear target and originate from merging of two parton ladders belonging to two different nucleons, which are close in the rapidity space. It allows us to propose that for a given momentum fraction $x_P$ carried by the diffractive exchange, nuclear shadowing and antishadowing should compensate each other in the momentum sum rule for nPDFs locally on the interval $\ln (x/x_P) \le 1$. We realize this by constructing an explicit model of nuclear gluon antishadowing, which has a wide support in $x$, $10^{-4} < x < 0.2$, peaks at $x=0.05-0.1$ at the level of $\approx 15$\% for $^{208}$Pb at $Q_0^2=4$ GeV$^2$ and rather insignificantly depends on details of the model. We also studied the impact parameter $b$ dependence of antishadowing and found it to be slow. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1612.08273v2-abstract-full').style.display = 'none'; document.getElementById('1612.08273v2-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, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 December, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 9 figures. Additional figures and discussion to compare to competing approaches. Final published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 95, 055208 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1611.05471">arXiv:1611.05471</a> <span> [<a href="https://arxiv.org/pdf/1611.05471">pdf</a>, <a href="https://arxiv.org/ps/1611.05471">ps</a>, <a href="https://arxiv.org/format/1611.05471">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.95.025204">10.1103/PhysRevC.95.025204 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Accessing transverse nucleon and gluon distributions in heavy nuclei using coherent vector meson photoproduction at high energies in ion ultraperipheral collisions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ph?searchtype=author&query=Guzey%2C+V">V. Guzey</a>, <a href="/search/hep-ph?searchtype=author&query=Strikman%2C+M">M. Strikman</a>, <a href="/search/hep-ph?searchtype=author&query=Zhalov%2C+M">M. Zhalov</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="1611.05471v2-abstract-short" style="display: inline;"> By using the theoretical approaches describing well the available data on $t$-integrated coherent photoproduction of light and heavy vector mesons in Pb-Pb ultraperipheral collisions (UPCs) at the Large Hadron Collider (LHC) in Run 1, we calculate the momentum transfer distributions for this process for $蟻$ and $J/蠄$ vector mesons in the kinematics of Run 2 at the LHC. We demonstrate that nuclear… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1611.05471v2-abstract-full').style.display = 'inline'; document.getElementById('1611.05471v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1611.05471v2-abstract-full" style="display: none;"> By using the theoretical approaches describing well the available data on $t$-integrated coherent photoproduction of light and heavy vector mesons in Pb-Pb ultraperipheral collisions (UPCs) at the Large Hadron Collider (LHC) in Run 1, we calculate the momentum transfer distributions for this process for $蟻$ and $J/蠄$ vector mesons in the kinematics of Run 2 at the LHC. We demonstrate that nuclear shadowing not only suppresses the absolute value of the cross sections, but also shifts the momentum transfer distributions toward smaller values of the momentum transfer $|t|$. This result can be interpreted as a broadening in the impact parameter space of the effective nucleon density in nuclei by 14\% in the case of $蟻$ and the nuclear gluon distribution by $5-11$\% in the case of $J/蠄$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1611.05471v2-abstract-full').style.display = 'none'; document.getElementById('1611.05471v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 March, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 November, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 5 figures. Matches the final published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 95, 025204 (2017) </p> </li> </ol> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Guzey%2C+V&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Guzey%2C+V&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Guzey%2C+V&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> <li> <a href="/search/?searchtype=author&query=Guzey%2C+V&start=100" class="pagination-link " aria-label="Page 3" aria-current="page">3 </a> </li> </ul> </nav> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> 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