Gluon saturation effects on the color singlet J/Psi production in high energy dA and AA collisions

TL;DR

This paper develops a theoretical framework for J/Psi production in high-energy nuclear collisions considering gluon saturation effects, and compares predictions with experimental data, highlighting the need for additional suppression or enhancement mechanisms.

Contribution

The paper derives new formulae for J/Psi production cross sections incorporating gluon saturation effects and performs numerical calculations to compare with experimental data.

Findings

Good agreement with dA collision data

Cold nuclear effects insufficient for AA collisions

Additional suppression/enhancement mechanisms needed

Abstract

We derive the formulae for the cross section of J/Psi production in high energy pA and AA collisions taking into account the gluon saturation/color glass condensate effects. We then perform the numerical calculations of the corresponding nuclear modification factors and find a good agreement between our calculations and the experimental data on J/Psi production in dA collisions. We also observe that cold nuclear modification effects alone cannot describe the data on J/Psi production in AA collisions. Additional final state suppression (at RHIC) and enhancement (at LHC) mechanisms are required to explain the experimental observations.