Behavior of Charmonium Systems after Deconfinement

TL;DR

This study investigates the behavior of charmonium states in hot gluonic plasma, revealing their survival up to 1.5 Tc and dissociation near 3 Tc, with significant medium effects on scalar and axial vector channels.

Contribution

It provides detailed lattice QCD analysis of charmonium spectral functions at high temperatures, extending understanding of quarkonium dissociation in quark-gluon plasma.

Findings

J/psi and eta_c survive up to 1.5 Tc

Scalar and axial vector mesons dissociate near Tc

Charmonium states weaken and disappear by 3 Tc

Abstract

We present a study of charmonia in hot gluonic plasma, for temperatures upto three times the deconfinement transition temperature Tc. q \bar{q} systems with quark masses close to the charm mass and different spin-parity quantum numbers were studied on very fine isotropic lattices. The analysis of temporal correlators, and spectral functions constructed from them, shows that the J/psi and eta_c survive up to quite high temperatures, with little observable change up to 1.5 Tc, and then gradually weakening and disappearing by 3 Tc. For the scalar and axial vector channels, serious modifications are induced by the hot medium already close to Tc, possibly dissociating the mesons by 1.1 Tc.