The pion quasiparticle in the low-temperature phase of QCD

TL;DR

This paper investigates the properties of the pion quasiparticle in low-temperature QCD, extending previous studies with new lattice data and theoretical analysis to understand chiral symmetry and meson behavior at finite temperature.

Contribution

The study extends previous lattice QCD analyses of pion quasiparticles by incorporating finite temperature effects and testing chiral relations at non-zero temperature and quark mass.

Findings

Confirmation of pion quasiparticle behavior at T≈151 MeV

Validation of the Gell-Mann--Oakes-Renner relation at finite temperature

Analysis of the Dey-Eletsky-Ioffe mixing theorem at finite quark mass

Abstract

We extend our previous studies [PhysRevD.90.054509, PhysRevD.92.094510] of the pion quasiparticle in the low-temperature phase of two-flavor QCD with support from chiral effective theory. This includes the analysis performed on a finite temperature ensemble of size $20\times 64^3$ at $T\approx 151$MeV and a lighter zero-temperature pion mass $m_{\pi} \approx 185$ MeV. Furthermore, we investigate the Gell-Mann--Oakes-Renner relation at finite temperature and the Dey-Eletsky-Ioffe mixing theorem at finite quark mass.