Forward $J/\psi$ production in pA collisions: centrality dependence

TL;DR

This paper investigates how the impact parameter dependence in the Color Glass Condensate model affects the centrality dependence of forward $J/$ suppression in proton-nucleus collisions, comparing with recent LHC data.

Contribution

It introduces an impact parameter dependent approach within the CGC framework to analyze centrality effects on $J/$ suppression in pA collisions.

Findings

The impact parameter dependence improves agreement with LHC data.

Centrality influences nuclear suppression patterns.

The model captures key features of the experimental results.

Abstract

The nuclear suppression of forward $J/\psi$ production in high energy proton-nucleus collisions can be used as a probe of gluon saturation at small $x$. In an earlier work we studied this suppression in minimum bias collisions in the Color Glass Condensate formalism, relying on the optical Glauber model to obtain the dipole cross section of the nucleus from the one of the proton fitted to HERA DIS data. Here we study how the impact parameter dependence of this model can be used to compare our results with recent LHC data on the centrality dependence of this suppression.