Overlap quark propagator near the physical pion mass

TL;DR

This study computes the Landau-gauge quark propagator with overlap fermions near the physical pion mass, analyzing its features and comparing results with Wilson fermions to understand non-perturbative QCD effects.

Contribution

It provides the first detailed calculation of the overlap quark propagator at near-physical pion mass on 2+1-flavour dynamical gauge fields, including a comparative analysis with Wilson fermions.

Findings

Features of mass and renormalisation functions are characterized.

Comparison shows differences and similarities with Wilson fermion results.

Results enhance understanding of non-perturbative quark behavior near physical pion mass.

Abstract

The Landau-gauge quark propagator is calculated using overlap fermions on 2+1-flavour dynamical fermion gauge fields from the PACS-CS collaboration with pion mass $m_\pi \sim 156\text{ MeV}$ and spatial volume $\sim (3 \text{ fm})^3.$ The observed features of the mass and renormalisation functions are discussed, including a comparison with recent results using $\mathcal{O}(a)$-improved Wilson fermions on 2-flavour dynamical gauge fields.