Quarkonium correlators and spectral functions at zero and finite temperature

TL;DR

This paper investigates quarkonium correlators and spectral functions at various temperatures using lattice QCD, revealing the persistence of some states in the quark-gluon plasma and the dissolution of others near the deconfinement point.

Contribution

It introduces a new algorithm for spectral function extraction and provides detailed lattice QCD analysis of quarkonium states at finite temperature.

Findings

1S quarkonium states survive at high temperatures

1P quarkonium states dissolve just above deconfinement

Use of multiple lattice spacings controls cutoff effects

Abstract

We study quarkonium correlators and spectral functions at zero and finite temperature using the anisotropic Fermilab lattice formulation with anisotropy xi=2 and 4. To control cutoff effects we use several different lattice spacings. The spectral functions were extracted from lattice correlators with Maximum Entropy Method based on a new algorithm. We find evidence for the survival of 1S quarkonium states in the deconfined medium till relatively high temperatures as well as for dissolution of 1P quarkonium states right above the deconfinement temperature.