Global Bayesian analysis of J / ψ photoproduction on proton and lead targets

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Abstract
We perform a global Bayesian analysis of diffractive J / ψ production in γ + p and γ + Pb collisions using a color glass condensate (CGC) based calculation framework. As past calculations have shown that CGC-based models typically overpredict the J / ψ production in γ + Pb collisions at high center of mass energy, we address the question of whether it is possible to describe coherent and incoherent diffractive J / ψ data from γ + p collisions at Hadron–Electron Ring Accelerator (HERA) and the LHC, and from γ + Pb collisions at the LHC simultaneously. Our results indicate that a simultaneous description of γ + p and γ + Pb data is challenging, with results improving when an overall K -factor—scaling γ + p and γ + Pb cross sections to absorb model uncertainties—is introduced.
Funding Information
  • Research Council of Finland
  • Centre of Excellence in Future Low-Energy Electronics Technologies, Australian Research Council (338263)
  • Centre of Excellence in Future Low-Energy Electronics Technologies, Australian Research Council (359902)
  • European Research Council (ERC-2023-101123801 GlueSatLight)
  • European Research Council (ERC-2018-ADG-835105 YoctoLHC)
  • U.S. Department of Energy (DE-SC0012704)
  • U.S. Department of Energy (DE-SC0021969)
  • U.S. Department of Energy (DE-SC0024232)
  • U.S. Department of Energy (DE-FG02-00ER41132)
  • Office of Science
  • Nuclear Physics
  • National Science Foundation (2030508)
  • National Science Foundation (2323298)
  • European Commission
  • JETSCAPE (OAC-2004571)

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