Quarkonia Photoproduction at Nucleus Colliders

TL;DR

This paper explores how exclusive photoproduction of heavy quarkonia in ultraperipheral collisions can help understand the small-x nuclear gluon density, presenting preliminary and simulation results at RHIC and LHC energies.

Contribution

It provides new insights into quarkonia photoproduction in nucleus colliders and includes preliminary data and simulation studies for J/Psi and Upsilon production.

Findings

Preliminary results on J/Psi photoproduction at RHIC.

Simulation studies of Upsilon production at LHC.

Potential constraints on small-x nuclear gluon density.

Abstract

Exclusive photoproduction of heavy quarkonia in high-energy ultraperipheral ion-ion interactions (gamma A --> V A, where V = J/Psi,Upsilon and the nucleus A remains intact) offers a useful means to constrain the small-x nuclear gluon density. We discuss preliminary results on J/Psi photoproduction in Au-Au collisions at RHIC energies, as well as full simulation-reconstruction studies of photo-produced Upsilon's in Pb-Pb interactions at the LHC.