Centrality, rapidity, and transverse-momentum dependence of gluon shadowing and antishadowing on $J/\psi$ production in $d$Au collisions at $\sqrt{s}$=200 GeV

TL;DR

This study investigates how gluon shadowing and antishadowing affect J/psi production in deuteron-gold collisions at 200 GeV, using exact kinematics and different gluon nPDF sets to compare with experimental data.

Contribution

It introduces a detailed analysis of gluon shadowing effects on J/psi production using exact 2→2 process kinematics and multiple nPDF sets, improving upon simplified models.

Findings

Shadowing and antishadowing significantly influence J/psi yields.

Transverse-momentum dependence is crucial for accurate predictions.

Results align with PHENIX experimental data.

Abstract

We have carried out a wide study of shadowing and antishadowing effects on \jpsi\ production in \dAu\ collisions at $\sqrt{s_{NN}}=200$ GeV. We have studied the effects of three different gluon nPDF sets, using the exact kinematics for a $2\to 2$ process, namely $g+g\to J/\psi+g$ as expected from LO pQCD. We have computed the rapidity dependence of \RCP\ and $R_{d\rm Au}$ for the different centrality classes of the PHENIX data. For mid rapidities, we have also computed the transverse-momentum dependence of the nuclear modification factor, which cannot be predicted with the usual $2\to 1$ simplified kinematics. All these observables have been compared to the PHENIX data in \dAu\ collisions.