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Title: Photoproduction of vector mesons in ultra-peripheral p–Pb and Pb–Pb collisions at the LHC with the ALICE experiment

Vector mesons are copiously produced in ultra-peripheral collisions. In these collisions, the impact parameter is larger than the sum of the radii of the two projectiles, implying that electromagnetic processes become dominant. The cross section of production of vector mesons is expected to be sensitive to the gluon distribution and can therefore probe nuclear gluon shadowing (Pb–Pb) and the gluon structure function in the nucleon (p-Pb). The ALICE Collaboration has performed the first measurements of the production of ρ{sup 0}, J/ψ and ψ/(2S) in Pb–Pb ultra-peripheral collision as well as the cross section for exclusive J/ψ photoproduction off protons in ultra-peripheral proton-lead collisions at the LHC. The results are compared to the STARLIGHT Monte Carlo and to QCD based models.
Authors:
 [1]
  1. On behalf of the ALICE Collaboration, Faculty of Nuclear Sciences and Physical Engineering Czech Technical University, Prague (Czech Republic)
Publication Date:
OSTI Identifier:
22391388
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1654; Journal Issue: 1; Conference: DIFFRACTION 2014: International Workshop on Diffraction in High-Energy Physics, Primosten (Croatia), 10-16 Sep 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CERN LHC; COLLIDING BEAMS; COMPARATIVE EVALUATIONS; CROSS SECTIONS; GLUONS; IMPACT PARAMETER; J PSI-3097 MESONS; LEAD 208 BEAMS; MONTE CARLO METHOD; MULTIPARTICLE SPECTROMETERS; PARTICLE IDENTIFICATION; PERIPHERAL COLLISIONS; PHOTOPRODUCTION; PSI-3685 MESONS; QUANTUM CHROMODYNAMICS; RHO-770 MESONS; STRUCTURE FUNCTIONS