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Photoproduction of $\rho^0$ mesons in ultra-peripheral Pb+Pb collisions has been studied by the ALICE Collaboration at the CERN LHC. The strong photon flux associated with relativistic charged nuclei leads to a very large cross section for…

Nuclear Experiment · Physics 2019-08-21 Kyrre Skjerdal

The first observation of coherent $\phi$(1020) meson photoproduction off heavy nuclei is presented using ultraperipheral lead-lead collisions at a center-of-mass energy per nucleon pair of 5.36 TeV. The data were collected by the CMS…

Nuclear Experiment · Physics 2026-01-14 CMS Collaboration

We investigate the theoretical uncertainty on the predictions for the photoproduction of J/psi and Upsilon states in the proton-nucleus and nucleus-nucleus collisions at the LHC within the color dipole formalism. Predictions for the…

High Energy Physics - Phenomenology · Physics 2015-09-30 G. Sampaio dos Santos , M. V. T. Machado

We report on our recent investigations in photonuclear production of heavy quarks and vector meson in ultraperipheral heavy ion collisions. In particular, our theoretical predictions are compared with the recent experimental measurements on…

High Energy Physics - Phenomenology · Physics 2008-11-26 V. P. Goncalves , M. V. T. Machado

Using the framework of leading order perturbative QCD along with the CTEQ6L1 gluon distribution of the proton and high-energy HERA data on the $\gamma p \to J/\psi p$ and $\gamma p \to \psi(2S) p$ cross sections along with the corresponding…

High Energy Physics - Phenomenology · Physics 2014-05-30 V. Guzey , M. Zhalov

Vector mesons are copiously produced in ultra-peripheral nucleus-nucleus collisions. In these collisions, the nuclei are separated by impact parameters larger than the sum of the nuclear radii, and the interaction is mediated by the…

Nuclear Experiment · Physics 2019-08-13 Joakim Nystrand

The exclusive $J/\Psi$ and $\Upsilon$ photoproduction in fixed - target collisions at the LHC and $ep(A)$ collisions at the Electron ion collider in China (EicC) is investigated considering different models for the treatment of the vector…

High Energy Physics - Phenomenology · Physics 2021-09-13 Ya-Ping Xie , Victor P. Goncalves

The ALICE Collaboration reports three measurements in ultra-peripheral proton$-$lead collisions at forward rapidity. The exclusive two-photon process \ggmm and the exclusive photoproduction of J/$\psi$ are studied. J/$\psi$ photoproduction…

Nuclear Experiment · Physics 2024-01-09 ALICE Collaboration

We present calculations for the incoherent photoproduction of J/$\psi$ vector mesons in ultra-peripheral heavy ion collisions (UPC) in terms of hadronic interactions. This study was carried out using the recently developed Monte Carlo model…

High Energy Physics - Phenomenology · Physics 2015-12-16 E. Andrade-II , I. González , A. Deppman , C. A. Bertulani

We present the first measurement at the LHC of exclusive J/$\psi$ photoproduction off protons, in ultra-peripheral proton-lead collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV. Events are selected with a dimuon pair produced either in the…

Nuclear Experiment · Physics 2015-07-15 ALICE Collaboration

In this paper we analyse the exclusive vector meson photoproduction in the recent run using Xenon-ions at energy of 5.44 TeV performed by the Large Hadron Collider. We focus on the ultraperipheral collisions and provide theoretical…

High Energy Physics - Phenomenology · Physics 2018-07-18 F. Kopp , M. V. T. Machado

The strong electromagnetic fields associated with high energy protons and nuclei may lead to exclusive photoproduction of vector mesons in proton-proton and nucleus-nucleus collisions at the LHC. This paper will discuss the expected cross…

High Energy Physics - Phenomenology · Physics 2007-05-23 Joakim Nystrand

In this work the double vector meson production in ultraperipheral heavy ion collisions is investigated within the BFKL approach. The integrated cross sections and event rates for the processes AA --> V1 V2 AA (V_i = rho, omega, phi, J/Psi,…

High Energy Physics - Phenomenology · Physics 2009-01-07 V. P. Goncalves , M. V. T. Machado , W. K. Sauter

By using a Regge-pole model for vector meson production (VMP), successfully describing the HERA data, we analyse the correlation between VMP cross sections in photon-induced reactions at HERA and those in ultra-peripheral collisions at the…

High Energy Physics - Phenomenology · Physics 2022-01-25 Laszlo Jenkovszky , Vladyslav Libov , Magno V. T. Machado

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

Exclusive vector meson photoproduction associated with a leading baryon ($B = n, \Delta^+, \Delta^0$) in $pp$ and $pA$ collisions at RHIC and LHC energies is investigated using the color dipole formalism and taking into account nonlinear…

High Energy Physics - Phenomenology · Physics 2018-04-11 F. Carvalho , V. P. Goncalves , F. S. Navarra , D. Spiering

Ultra-peripheral collisions of heavy ions provide a unique environment to study the gluon structure of nuclei through photon-induced reactions. In particular, the incoherent photoproduction of J/$\psi$ vector meson is sensitive to…

Nuclear Experiment · Physics 2025-10-14 Vendulka Humlová

We investigate the theoretical uncertainty on the predictions for the photoproduction of $\rho$ and $J/\Psi$ states in nucleus-nucleus collisions at Run 2 LHC energies using the Color Dipole formalism. The results for rapidity distributions…

High Energy Physics - Phenomenology · Physics 2018-06-13 V. P. Goncalves , M. V. T. Machado , B. D. Moreira , F. S. Navarra , G. Sampaio dos Santos

Vector mesons are copiously produced in ultra-peripheral collisions. In these collisions, the impact parameter is larger than the sum of the radii of two projectiles, implying that electromagnetic processes become dominant. The cross…

High Energy Physics - Experiment · Physics 2019-08-13 Michal Broz

The coherent J/$\psi$ photoproduction cross section is measured for the first time at midrapidity in peripheral to semicentral Pb$-$Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV. The centrality differential cross section ${\rm d} \sigma/…

Nuclear Experiment · Physics 2026-01-14 ALICE Collaboration