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Home > Physical Review C (APS) > Coherent photoproduction of <math><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow></math> 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/\psi $ mesons in ultraperipheral heavy-ion collisions in the color dipole approach. We first test a number of dipole cross sections fitted to inclusive ${F}_{2}$ data against the total cross section of exclusive $J/\psi $ 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/\psi $ production in ultraperipheral lead-lead collisions at $\sqrt{{s}_{NN}}=2.76$ and $\sqrt{{s}_{NN}}=5.02\phantom{\rule{0.28em}{0ex}}\mathrm{TeV}$. Especially at high-$\gamma A$ 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