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  • Letter
  • Open Access

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

Heikki Mäntysaari1,2,*, Farid Salazar3,4,5,6,7, and Björn Schenke8

  • 1Department of Physics, University of Jyväskylä,  P.O. Box 35, 40014 University of Jyväskylä, Finland
  • 2Helsinki Institute of Physics, P.O. Box 64, 00014 University of Helsinki, Finland
  • 3Institute for Nuclear Theory, University of Washington, Seattle Washington 98195-1550, USA
  • 4Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 5Physics Department, University of California, Berkeley, California 94720, USA
  • 6Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
  • 7Mani L. Bhaumik Institute for Theoretical Physics, University of California, Los Angeles, California 90095, USA
  • 8Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA

  • *heikki.mantysaari@jyu.fi
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Phys. Rev. D 109, L071504 – Published 15 April, 2024

DOI: https://doi.org/10.1103/PhysRevD.109.L071504

Abstract

We calculate exclusive J/ψ photoproduction at high energies in the color glass condensate approach. The results are compared to the center-of-mass energy dependent γ+A→J/ψ+A cross sections extracted from measurements in ultraperipheral heavy ion collisions at RHIC and LHC. We predict strong saturation-driven nuclear suppression at high energies, while LHC data prefer even stronger suppression. We explore effects of nucleon shaped fluctuations and show that the most recent measurement of the |t|-differential incoherent J/ψ cross section prefers large event-by-event fluctuations of the nucleon substructure in heavy nuclei, comparable to that found for a free proton.

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Phys. Rev. D 109, L071504– Published 15 April, 2024
  • Received 20 December 2023
  • Accepted 16 February 2024
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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