Global Bayesian Analysis of $\mathrm{J}/\psi$ Photoproduction on Proton and Lead Targets

Abstract

We perform a global Bayesian analysis of diffractive $\mathrm{J}/\psi$ production in $\gamma +p$ and $\gamma +\mathrm{Pb}$ collisions using a color glass condensate (CGC) based calculation framework. As past calculations have shown that CGC-based models typically overpredict the $\mathrm{J}/\psi$ production in $\gamma +\mathrm{Pb}$ collisions at high center of mass energy, we address the question of whether it is possible to describe coherent and incoherent diffractive $\mathrm{J}/\psi$ data from $\gamma +p$ collisions at HERA and the LHC, and from $\gamma +\mathrm{Pb}$ collisions at the LHC simultaneously. Our results indicate that a simultaneous description of $\gamma +p$ and $\gamma +\mathrm{Pb}$ data is challenging, with results improving when an overall $K$-factor -- scaling $\gamma +p$ and $\gamma +\mathrm{Pb}$ cross sections to absorb model uncertainties -- is introduced.

16 pages, 4 figures

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• Learning Informed Prior Distributions with Normalizing Flows for Bayesian Analysis
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• Probing nuclear structure with the Balitsky-Kovchegov equation in full impact-parameter dependence