J/Psi production in heavy ion collisions and gluon saturation

TL;DR

This paper investigates J/Psi production in heavy ion collisions, emphasizing the role of gluon saturation and its impact on rapidity distribution and suppression patterns at RHIC energies.

Contribution

It introduces a model incorporating gluon saturation effects to explain J/Psi production differences in heavy ion versus hadron-hadron collisions.

Findings

Rapidity distribution of J/Psi is more peaked at midrapidity in heavy ion collisions.

Gluon saturation significantly influences J/Psi production mechanisms.

The model provides insights into J/Psi suppression observed at RHIC.

Abstract

We calculate the inclusive J/Psi production in heavy ion collisions including the effects of gluon saturation in the wave functions of the colliding nuclei. We argue that the dominant production mechanism in proton--nucleus and nucleus--nucleus collisions for heavy nuclei is different from the one in hadron-hadron interactions. We find that the rapidity distribution of primary J/Psi production is more peaked around midrapidity than the analogous distribution in elementary pp collisions. We discuss the consequences of this fact on the experimentally observed J/Psi suppression in Au-Au collisions at RHIC energies.