Chiral Properties of Quenched and Full QCD

TL;DR

This paper develops a method for accurately extrapolating hadron masses in both quenched and full QCD, capturing their non-analytic behaviors and differences due to meson loops.

Contribution

It introduces an extended technique for chiral extrapolation that correctly models non-analytic behaviors in quenched and full QCD simulations.

Findings

The method accurately reproduces the leading and next-to-leading non-analytic behaviors.

Differences between quenched and dynamical baryon masses are primarily due to meson loop effects.

The approach ensures correct large quark mass behavior.

Abstract

We extend a technique for the chiral extrapolation of hadron masses calculated with dynamical fermions to those generated by quenched simulations. The method ensures the correct leading and next-to-leading non-analytic behaviour for either QCD or quenched QCD in the chiral limit, as well as the correct large quark mass behaviour. We find that the primary difference between quenched and dynamical baryon masses can be described by the meson loops which give rise to the different leading and next-to-leading non-analytic behaviour.