Finite temperature Landau gauge lattice quark propagator

Orlando Oliveira,Paulo J Silva

doi:10.1140/epjc/s10052-019-7300-8

Orlando Oliveira, Paulo J Silva

Open Access

https://doi.org/10.1140/epjc/s10052-019-7300-8

Copy DOI

Abstract

The quark propagator at finite temperature is investigated using quenched gauge configurations. The propagator form factors are investigated for temperatures above and below the gluon deconfinement temperature T_c and for the various Matsubara frequencies. Significant differences between the functional behaviour below and above T_c are observed both for the quark wave function and the running quark mass. The results for the running quark mass indicate a link between gluon dynamics, the mechanism for chiral symmetry breaking and the deconfinement mechanism. For temperatures above T_c and for low momenta, our results support also a description of quarks as free quasiparticles.

Highlights

Introduction and motivationThe study of strong interactions including temperature and density effects has been driven both by the tentative to understand the QCD dynamics and a strong experimental program that involves various facilities
In the current work we report on the computation of the finite temperature Landau gauge lattice QCD quark propagator in the quenched approximation at small quark masses ∼ 10 MeV and ∼ 50 MeV for temperatures below and above the deconfinement phase transition
The various quark form factors are investigated as a function of the temperature for the various Matsubara frequencies

Summary

Introduction

The study of strong interactions including temperature and density effects has been driven both by the tentative to understand the QCD dynamics and a strong experimental program that involves various facilities. This research includes the computation of two-point correlation functions that provide information on spectra, transport properties and other fundamental properties such as the confinement mechanism. We will not consider the dependence on the density of the hadronic matter. Quarks and gluons are confined particles and appear only as constituents of mesons and baryons. At sufficiently high temperatures or densities, quark and gluons are expected to become deconfined and behave as free quasiparticles in a new state of matter, the strong coupled quark gluon plasma. Due to asymptotic freedom, quarks and gluons can be considered as free particles

Objectives

Findings

Conclusion