Transverse momentum dependence of J/psi shadowing effects

TL;DR

This paper introduces a new method to estimate gluon shadowing effects on J/psi production in nucleus collisions, using proton-proton data and Glauber Monte Carlo simulations to predict transverse momentum dependence.

Contribution

It presents a novel approach combining multiple scattering and Q2 evolution models to analyze shadowing effects on J/psi yields in nuclear collisions.

Findings

First predictions of pT dependence of nuclear modification factor in d+Au collisions.

Comparison of shadowing parameterizations based on transverse momentum.

Implementation of a Glauber Monte Carlo code incorporating shadowing effects.

Abstract

We present a new approach to estimate the effect of the gluon shadowing in nucleus+nucleus collisions and its consequences on the J/psi production yield. Using kinematical information available from the measured J/psi production in proton+proton collisions at \sqrt s = 200 GeV, we build a Glauber Monte Carlo code which takes into account shadowing in two alternative ways: multiple scattering corrections or Q2 evolution of parton densities. We exploit the dependence of these different parameterizations to the J/psi transverse momentum and we give the first predictions on the resulting pT dependence of the nuclear modification factor in deuteron+gold collisions at the same energy.