Charmonium correlation and spectral functions at finite temperature

TL;DR

This study investigates charmonium states at finite temperature using lattice QCD, revealing early melting of J/psi and eta_c, and identifying heavy quark transport contributions in spectral functions.

Contribution

First lattice QCD analysis to identify heavy quark transport contributions in charmonium spectral functions at finite temperature.

Findings

J/psi melts at 1.46 T_c

eta_c dissolves at 1.46 T_c and above

Heavy quark transport contribution identified in spectral functions

Abstract

We study the properties of charmonium states at finite temperature in quenched QCD on isotropic lattices. We measured charmonium correlators using non-perturbatively $\cO(a)$ improved clover fermions on fine ($a=0.01$ fm) lattices with a relatively large size of $128^{3}\times 96$, $128^3\times48$, $128^3\times32$ and $128^3\times24$ at $0.73~T_c$, $1.46~T_c$, $2.20~T_c$ and $2.93~T_c$, respectively. Our analysis suggests that $\Jpsi$ is melted already at $1.46~T_c$ and $\eta_c$ starts to dissolve at $1.46~T_c$ and does not exist at higher temperatures. We also identify the heavy quark transport contribution at the spectral function level for the first time.