Heavy-Quarkonia in the Star Experiment

TL;DR

This paper reports preliminary measurements of heavy quarkonium states in proton-proton and copper-copper collisions at RHIC, aiming to understand quark-gluon plasma formation through suppression patterns of different states.

Contribution

It provides new experimental data on charmonium and bottomonium suppression patterns in heavy ion collisions at RHIC energies.

Findings

Observed suppression patterns of quarkonium states in Cu+Cu collisions.

Comparison between p+p and Cu+Cu collision results.

Insights into medium temperature effects on quarkonium states.

Abstract

Heavy Quarkonium states modifications in relativistic heavy ion collisions have been of great interest since the proposal by Matsui and Satz of J/psi suppression as a signature of Quark-Gluon Plasma (QGP) formation. Recent studies suggest that the excited states chi_c, psi(2S) and Upsilon(3S) melt sequentially[1,2] and the amount of observed suppression depends on the state and medium conditions. Therefore, this suppression pattern may be used as a probe of the medium temperature. In this work we present preliminary results on the charmonium and bottomnium measurements performed by the STAR experiment at RHIC for p+p and Cu+Cu collisions at sqrt(s_{NN})=200GeV