Charmonium correlators and spectral functions at finite temperature

TL;DR

This paper investigates the in-medium behavior of charmonium using spectral functions and correlators, evaluating the maximum entropy method's reliability and default model dependence at finite temperature.

Contribution

It introduces an operational approach to analyze charmonium spectral functions and assesses the robustness of MEM in extracting in-medium properties.

Findings

Correlator ratios depend on resonance width and continuum threshold.

MEM spectral functions show default model dependence.

The approach clarifies the reliability of spectral function extraction at finite temperature.

Abstract

We present an operational approach to address the in-medium behavior of charmonium and analyze the reliability of maximum entropy method (MEM). We study the dependences of the ratio of correlators to the reconstructed one and the free one on the resonance's width and the continuum's threshold. Furthermore, we discuss the issue of the default model dependence of the spectral function obtained from MEM.