Spectral properties of quarks above T_c in quenched lattice QCD

TL;DR

This study investigates the spectral properties of quarks above the critical temperature in quenched lattice QCD, revealing the presence of collective modes and their dependence on quark mass using a two-pole approximation.

Contribution

It demonstrates that the quark spectral function can be effectively modeled with a two-pole approximation and explores the mass dependence of spectral features in quenched lattice QCD.

Findings

Identification of two collective modes in the chiral limit

Single pole dominance at large quark masses

Effective two-pole model reproduces correlator data

Abstract

We analyze the quark spectral function above the critical temperature for deconfinement in quenched lattice QCD using clover improved Wilson fermions in Landau gauge. We show that the temporal quark correlator is well reproduced by a two-pole approximation for the spectral function and analyze the bare quark mass dependence of both poles as well as their residues. In the chiral limit we find that the quark spectral function has two collective modes which correspond to the normal and plasmino excitations. At large values of the bare quark mass the spectral function is dominated by a single pole.