Quark propagator at finite temperature and finite momentum in quenched lattice QCD

TL;DR

This study analyzes the quark spectral function at finite temperature and momentum in quenched lattice QCD, revealing the presence of collective modes and their dependence on temperature and quark mass, with implications for understanding quark excitations.

Contribution

It provides a detailed analysis of the quark spectral function using a two-pole ansatz across different temperatures and quark masses, highlighting the behavior of collective modes in the deconfined phase.

Findings

Quark spectral function well described by a two-pole ansatz near the critical temperature.

Presence of normal and plasmino collective modes at high temperature in the chiral limit.

Thermal mass of quarks approximately proportional to temperature over a wide range.

Abstract

We present an analysis of the quark spectral function above and below the critical temperature for deconfinement performed at zero and non-zero momentum in quenched lattice QCD using clover improved Wilson fermions in Landau gauge. It is found that the temporal quark correlation function in the deconfined phase near the critical temperature is well reproduced by a two-pole ansatz for the spectral function. This indicates that excitation modes of the quark field have small decay rates. The bare quark mass and momentum dependence of the spectral function is analyzed with this ansatz. In the chiral limit we find that the quark spectral function has two collective modes corresponding to the normal and plasmino excitations in the high temperature limit. Over a rather wide temperature range in the deconfined phase the pole mass of these modes at zero momentum, which corresponds to the thermal mass of the quark, is approximately proportional to temperature. With increasing bare quark masses the plasmino mode gradually disappears and the spectral function is dominated by a single pole. We also discuss quasi-particle properties of heavy quarks in the deconfined phase. In the confined phase, it is found that the pole ansatz for the spectral function fails completely.