Cold Nuclear Matter Effects on extrinsic J/psi production at sqrt{s_{NN}}=2.76 TeV at the LHC

TL;DR

This paper investigates how cold nuclear matter effects, including gluon shadowing and nuclear absorption, influence J/psi production in proton-lead and lead-lead collisions at the LHC, revealing significant suppression and rapidity dependence.

Contribution

It provides a detailed analysis of cold nuclear matter effects on J/psi production using complete kinematics of the LO pQCD process, highlighting the impact of shadowing and absorption.

Findings

Large J/psi suppression due to shadowing

Strong rapidity dependence of suppression

Quantitative estimates of cold nuclear matter effects

Abstract

We evaluate the Cold Nuclear Matter effects on J/psi production in pPb and PbPb collisions at the current LHC energy, taking into account the gluon shadowing and the nuclear absorption. We use the complete kinematics in the underlying 2 to 2 partonic process, namely $g+g \to \jpsi + g$ as expected from LO pQCD. The resulting shadowing is responsible for a large J/psi suppression in pPb and PbPb, and shows a strong rapidity dependence.