Coherent photoproduction of J/ψ in nucleus-nucleus collisions in the color dipole approach

Łuszczak, Agnieszka (T. Kościuszko Cracow University of Technology, PL-30-067 Cracow, Poland) ; Schäfer, Wolfgang (Institute of Nuclear Physics Polish Academy of Sciences, ulica Radzikowskiego 152, PL-31-342 Cracow, Poland)

09 April 2019

Abstract: We investigate the exclusive photoproduction of J/ψ mesons in ultraperipheral heavy-ion collisions in the color dipole approach. We first test a number of dipole cross sections fitted to inclusive F2 data against the total cross section of exclusive J/ψ production on the free nucleon. We then use the color dipole formulation of Glauber-Gribov theory to calculate the diffractive amplitude on the nuclear target. The real part of the free-nucleon amplitude is taken into account consistent with the rules of Glauber theory. We compare our results to recent published and preliminary data on exclusive J/ψ production in ultraperipheral lead-lead collisions at sNN=2.76 and sNN=5.02TeV. Especially at high-γA energies there is room for additional shadowing corrections, corresponding to triple-Pomeron terms or shadowing from large mass diffraction.

Published in: Physical Review C 99 (2019)
Published by: APS
DOI: 10.1103/PhysRevC.99.044905
arXiv: 1901.07989
License: CC-BY-4.0

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