Shadowing Effects on $J/\psi$ and $\Upsilon$ Production at the LHC

TL;DR

This paper investigates how shadowing effects influence the production of quarkonium states like J/ψ and Υ in proton-lead collisions at the LHC, providing insights into cold nuclear matter effects and gluon modifications.

Contribution

It offers a detailed analysis of shadowing effects on quarkonium production, highlighting the role of gluon density modifications in nuclei at high energies.

Findings

Shadowing reduces quarkonium yields in proton-lead collisions.

Gluon modifications significantly impact J/ψ and Υ production.

Results help interpret cold nuclear matter effects at the LHC.

Abstract

Background: Proton-nucleus collisions have been used as a intermediate baseline for the determination of cold medium effects. They lie between proton-proton collisions in vacuum and nucleus-nucleus collisions which are expected to be dominated by hot matter effects. Modifications of the quark densities in nuclei relative to those of the proton are well established although those of the gluons in the nucleus are not well understood. We focus on the effect of these on quarkonium production in proton-lead collisions at the LHC at a center of mass energy of 5.02 TeV.