Coherent photoproduction of $J/\psi$ in nucleus-nucleus collisions in the color dipole approach

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 $J/\psi$ corrections in ultraperipheral lead-lead collisions at $\sqrt{s_{NN}}=2.76\mathrm{TeV}$ and $\sqrt{s_{NN}}=5.02\mathrm{TeV}$. Especially at high $\gamma A$ energies there is room for additional shadowing corrections, corresponding to triple-Pomeron terms or shadowing from large mass diffraction.

16 pages, 6 figures

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• Investigating saturation effects in ultraperipheral collisions at the LHC with the color dipole model
• Probing small Bjorken-$x$ nuclear gluonic structure via coherent J/$\psi$ photoproduction in ultraperipheral PbPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Nuclear suppression from coherent $J/\psi$ photoproduction at the Large Hadron Collider
• Overview of high-density QCD studies with the CMS experiment at the LHC
• Unintegrated gluon distributions from the color dipole cross section in the BGK saturation model
• Exclusive photoproduction of excited quarkonia in ultraperipheral collisions
• Finite-size effects on small-$x$ evolution and saturation in proton and nuclear targets
• Global Bayesian Analysis of $\mathrm{J}/\psi$ Photoproduction on Proton and Lead Targets
• Measurement of coherent exclusive $J/\psi \to {\mu }^{+}{\mu }^{-}$ production in ultraperipheral Pb+Pb collisions at $\sqrt{s_{\text{NN}}}=5.36$ TeV with the ATLAS detector
• The reggeometric pomeron and exclusive production of $J/\psi$ and $\psi (2S)$ in ultraperipheral collisions at the LHC