Collisional and thermal dissociation of $J/\psi$ and $\Upsilon$ states at the LHC

TL;DR

This paper models the suppression of various quarkonium states in lead-lead collisions at the LHC, combining collisional dissociation and thermal effects to match experimental data and predict outcomes at higher energies.

Contribution

It introduces a combined theoretical framework for quarkonium suppression that accounts for collisional and thermal dissociation effects in quark-gluon plasma.

Findings

Good agreement with experimental suppression data at 2.76 TeV

Predictions for suppression at 5.02 TeV are provided

The model captures the relative suppression of different quarkonium states

Abstract

We present new results for the suppression of high transverse momentum charmonium [$J/\psi, \psi(2S)$] and bottomonium [$\Upsilon(1S),\Upsilon(2S),\Upsilon(3S)$] states in Pb+Pb collisions at the Large Hadron Collider. Our theoretical formalism combines the collisional dissociation of quarkonia, as they propagate in the quark-gluon plasma, with the thermal wavefunction effects due to the screening of the $Q\bar{Q}$ attractive potential in the medium. We find that a good description of the relative suppression of the ground and higher excited quarkonium states, transverse momentum and centrality distributions is achieved, when comparison to measurements at a center-of-mass energy of 2.76 TeV is performed. Theoretical predictions for the highest Pb+Pb center-of-mass energy of 5.02 TeV at the LHC, where new experimental results are being finalized, are also presented.