Quenched Chiral Behavior of Hadrons with Overlap Fermions

TL;DR

This paper investigates the quenched chiral behavior of hadrons using overlap fermions on a lattice, identifying quenched chiral logs, renormalized quark masses, and artifacts in specific propagators at low pseudoscalar masses.

Contribution

It provides new insights into quenched chiral logs and artifacts in hadron propagators using overlap fermions on a large lattice with improved gauge action.

Findings

Observation of quenched chiral logs in pion mass

Determination of renormalized quark mass

Identification of quenched artifacts in $a_0$ and $N^*$ propagators

Abstract

We study the quenched chiral behavior of hadrons with the pseudoscalar mass as low as $\approx 280$ MeV. We look for quenched chiral logs in the pion mass, determine the renormalized quark mass, and observe quenched artifacts in the $a_0$ and $N^*$ propagators. The calculation is done on a quenched lattice of size $20^4$ and $a = 0.148(2)$ fm using overlap fermions and an improved gauge action.