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

Author:

Mäntysaari Heikki12ORCID,Salazar Farid34567,Schenke Björn8

Affiliation:

1. Department of Physics, University of Jyväskylä,  P.O. Box 35, 40014 University of Jyväskylä, Finland

2. Helsinki Institute of Physics, P.O. Box 64, 00014 University of Helsinki, Finland

3. Institute for Nuclear Theory, University of Washington, Seattle Washington 98195-1550, USA

4. Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

5. Physics Department, University of California, Berkeley, California 94720, USA

6. Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA

7. Mani L. Bhaumik Institute for Theoretical Physics, University of California, Los Angeles, California 90095, USA

8. Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA

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+AJ/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. Published by the American Physical Society 2024

Funder

Horizon 2020 Framework Programme

European Research Council

U.S. Department of Energy

Office of Science

Nuclear Physics

National Science Foundation

Research Council of Finland

Publisher

American Physical Society (APS)

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