Spectral functions of charmonium from 2 flavour anisotropic lattice data

TL;DR

This paper investigates the spectral functions of charmonium in high-temperature two-flavor QCD using anisotropic lattice data and the Maximum Entropy Method, revealing stable zero-momentum spectra and resonance features at non-zero momentum.

Contribution

It presents the first application of the Maximum Entropy Method to anisotropic lattice data for charmonium spectral functions at high temperature.

Findings

Spectral functions at zero momentum are stable.

Resonance and transport peaks are observed at non-zero momentum.

Work contributes to calculating the heavy quark diffusion constant.

Abstract

The spectral functions of QCD can give us insight into properties of hadrons, and they are useful in probing the QCD vacuum. I will discuss the correlators and spectral functions of charmonium in high temperature two flavour QCD. The spectral functions have been obtained using the Maximum Entropy Method from anisotropic lattice data using the conserved vector current. This work has been done as part of the FASTSUM collaboration. We find that the spectral functions for zero momentum are stable. At non-zero momentum the spectral functions are less stable but still produce resonance and transport peaks. This work is part of our programme to calculate the heavy quark diffusion constant.