Charmonium dissociation and recombination at LHC: Revisiting comovers

TL;DR

This paper revisits the comover interaction model to describe charmonium production at LHC energies, including dissociation and recombination effects, successfully matching experimental data and providing predictions for higher energies.

Contribution

It introduces a parameter-free formalism for charmonium production that combines dissociation and recombination within the comover interaction model, incorporating nuclear shadowing effects.

Findings

Model accurately describes PbPb collision data at 2.76 TeV

Predicts charmonium yields at 5.5 TeV for future experiments

Incorporates initial-state nuclear shadowing analytically

Abstract

We present our results on charmonium production at the Large Hadron Collider energies within the comover interaction model. The formalism includes both comover dissociation of $J/\psi$'s and possible secondary $J/\psi$ production through recombination. The estimation of this effect is made without involving free parameters. The comover interaction model also incorporates an analytic treatment of initial-state nuclear shadowing. With these tools, the model successfully describes the centrality, transverse momentum and rapidity dependence of the experimental data from PbPb collisions at the LHC energy of $\sqrt{s} = 2.76$ TeV. We present predictions for PbPb collisions at $\sqrt{s} = 5.5$ TeV.