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Related papers: Collision geometry in UPC dijet production

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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…

High Energy Physics - Phenomenology · Physics 2024-07-03 Kari J. Eskola , Vadim Guzey , Ilkka Helenius , Petja Paakkinen , Hannu Paukkunen

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…

High Energy Physics - Phenomenology · Physics 2023-11-30 Kari J. Eskola , Vadim Guzey , Ilkka Helenius , Petja Paakkinen , Hannu Paukkunen

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…

High Energy Physics - Phenomenology · Physics 2024-10-04 Kari J. Eskola , Vadim Guzey , Ilkka Helenius , Petja Paakkinen , Hannu Paukkunen

In ultra-relativistic heavy ion collisions at the LHC, each nucleus acts a sources of high-energy real photons that can scatter off the opposing nucleus in ultra-peripheral photonuclear ($\gamma+A$) collisions. Hard scattering processes…

Nuclear Experiment · Physics 2025-03-28 ATLAS Collaboration

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…

High Energy Physics - Phenomenology · Physics 2019-07-08 V. Guzey , M. Klasen

In ultra-relativistic heavy ion collisions at the LHC, each nucleus acts as a source of high-energy quasi-real photons that can participate in scattering processes without causing either participating nucleus to break up and emit forward…

Nuclear Experiment · Physics 2026-04-29 ATLAS Collaboration

The exclusive $\Upsilon$ photoproduction in ultraperipheral proton-nucleus and nucleus-nucleus collisions at LHC energies is being investigated using pQCD framework which constrain the gluon distribution in the proton and nuclei at low $x$.…

High Energy Physics - Phenomenology · Physics 2017-11-17 Dipanwita Dutta , Ruchi Chudasama

In this talk we apply the photoproduction framework recently implemented into the Pythia 8 Monte Carlo event generator to study the potential of photo-nuclear dijets in ultra-peripheral Pb+Pb collisions at the LHC to further constrain the…

High Energy Physics - Phenomenology · Physics 2018-12-03 Ilkka Helenius

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…

High Energy Physics - Phenomenology · Physics 2021-07-01 V. Guzey , M. Klasen

We present the first NLO pQCD study of coherent exclusive $J/\psi$ photoproduction in ultraperipheral heavy-ion collisions (UPCs) at the LHC. Taking the generalized parton distributions (GPDs) in their forward limit, as parton distribution…

High Energy Physics - Phenomenology · Physics 2022-09-20 K. J. Eskola , C. A. Flett , V. Guzey , T. Löytäinen , H. Paukkunen

Cross sections for the coherent photoproduction of $\rho^{0}$ vector mesons in ultra-peripheral Pb-Pb collisions at $ \sqrt{s_{\mathrm{NN}}}= 5.02$ TeV are reported. The measurements, which rely on the $\pi^+\pi^-$ decay channel, are…

Nuclear Experiment · Physics 2020-06-25 ALICE Collaboration

The intense photon fluxes of relativistic nuclei provide a possibility to study photonuclear and two-photon interactions in ultra-peripheral collisions (UPC) where the nuclei do not overlap and no strong nuclear interactions occur. The…

High Energy Physics - Experiment · Physics 2019-08-14 V. Pozdniakov

In ultraperipheral collisions (UPCs) of relativistic nuclei without overlap of nuclear densities, the two nuclei are excited by the Lorentz-contracted Coulomb fields of their collision partners. In these UPCs, the typical nuclear excitation…

Nuclear Experiment · Physics 2023-06-22 ALICE Collaboration

High-energy photonuclear ($\gamma+A$) scattering in ultra-peripheral heavy-ion collisions provides a unique probe of nuclear structure. This Letter studies the dependence of $\gamma+A$ jet production in ultra-peripheral Pb+Pb collisions at…

Nuclear Experiment · Physics 2026-04-23 ATLAS Collaboration

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…

High Energy Physics - Phenomenology · Physics 2021-01-04 V. Guzey , M. Klasen

We make predictions for the cross section of coherent $J/\psi$ photoproduction in Pb-Pb and O-O ultraperipheral collisions (UPCs) at the LHC as a function of the $J/\psi$ rapidity $y$ in the framework of collinear factorization and…

High Energy Physics - Phenomenology · Physics 2023-03-23 K. J. Eskola , V. Guzey , T. Löytäinen , H. Paukkunen , C. A. Flett

We study diffractive vector meson production in ultra-peripheral collisions (UPCs) of heavy nuclei, utilizing a theoretical framework based on the Color Glass Condensate (CGC) formalism. We focus on Au+Au, U+U, Ru+Ru, Zr+Zr, and Pb+Pb…

Nuclear Theory · Physics 2023-10-25 Heikki Mäntysaari , Farid Salazar , Björn Schenke , Chun Shen , Wenbin Zhao

We present a perturbative QCD analysis concerning the production of high-pT dijets in p+Pb collisions at the LHC. The next-to-leading order corrections, scale variations and free-proton PDF uncertainties are found to have only a relatively…

High Energy Physics - Phenomenology · Physics 2015-06-22 Hannu Paukkunen , Kari J. Eskola , Carlos Salgado

Dijet production in proton-nucleus ($p$A) collisions at the LHC provides invaluable information on the underlying parton distributions in nuclei, especially the gluon distributions. Triple-differential dijet cross sections enable a…

High Energy Physics - Phenomenology · Physics 2022-06-08 Shuwan Shen , Peng Ru , Ben-Wei Zhang

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,…

High Energy Physics - Phenomenology · Physics 2024-03-27 V. Guzey
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