Energy dependent nuclear suppression from gluon saturation in exclusive vector meson production

Abstract

We calculate the exclusive $\mathrm{J}/\psi$ photoproduction cross section at high energies from the Color Glass Condensate approach. The results are compared to the center-of-mass energy dependent $\gamma +A\to \mathrm{J}/\psi +A$ cross sections extracted from measurements in ultra peripheral heavy ion collisions at RHIC and LHC. We predict strong saturation-driven nuclear suppression at high energies, while LHC data prefers even stronger suppression. We explore the effect of nucleon shape fluctuations on the nuclear suppression in the coherent and incoherent cross sections, and show that the most recent measurement of the $|t|$-differential incoherent $\mathrm{J}/\psi$ cross section prefers large event-by-event fluctuations of the nucleon substructure in heavy nuclei, comparable to that found for a free proton.

9 pages, 5 figures. v2 published in PRD

References in corpus (12)

• The Color Glass Condensate
• Resumming double logarithms in the QCD evolution of color dipoles
• Exclusive J/$\psi$ photoproduction off protons in ultra-peripheral p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Revealing proton shape fluctuations with incoherent diffraction at high energy
• Mining for Gluon Saturation at Colliders
• J/Psi production in ultraperipheral Pb+Pb and p+Pb collisions at energies available at the CERN Large Hadron Collider
• Imaging the nucleus with high-energy photons
• Non-linear evolution in QCD at high-energy beyond leading order
• Energy dependence of dissociative $J/\psi$ photoproduction as a signature of gluon saturation at the LHC
• Color dipole predictions for the exclusive vector meson photoproduction in $pp/pPb/PbPb$ collisions at Run 2 LHC energies
• Inferring the initial condition for the Balitsky-Kovchegov equation
• Complete Next-to-Leading Order Calculation of Single Inclusive ${\pi }^0$ Production in Forward Proton-Nucleus Collisions

Cited by in corpus (13)

• Finite-size effects on small-$x$ evolution and saturation in proton and nuclear targets
• Gluon Saturation Effects in Exclusive Heavy Vector Meson Photoproduction
• Global Bayesian Analysis of $\mathrm{J}/\psi$ Photoproduction on Proton and Lead Targets
• Measurement of exclusive $J/\psi$ and $\psi (2S)$ production at $\sqrt{s}=13$ TeV
• Probing gluon fluctuations in nuclei with the first energy-dependent measurement of incoherent J/$\psi$ photoproduction in ultraperipheral PbPb collisions
• Testing the double-logarithm asymptotic gluon density in ultraperipheral heavy ion collisions at the Large Hadron Collider
• The energy dependence of exclusive heavy vector meson photoproduction cross-sections and NLO BFKL evolution
• 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
• Photoproduction of ${\eta }_c\gamma$ pairs in CGC framework
• Off forward non-SCHC contributions to exclusive vector quarkonium production from the "spin dependent BFKL Pomeron"
• Analysis of $J/\psi$ and $\psi (2S)$ Charmonium Production in Ultraperipheral Lead-Lead and Proton-Lead Collisions at LHC Energies
• Coherent photoproduction of ${\rho }^0,\omega$ and excited vector mesons in ultraperipheral PbPb collisions
• Evaluating the ratio of the exclusive vector meson photoproduction to inclusive hadron/jet production cross section in ultraperipheral heavy ion collisions