Hadron Masses From Novel Fat-Link Fermion Actions

TL;DR

This paper introduces a new fat-link clover fermion action for lattice QCD that improves hadron mass calculations by reducing discretization errors and exceptional configurations, using smeared links in irrelevant operators.

Contribution

The paper presents a novel fat-link fermion action with smeared links in irrelevant operators, demonstrating improved scaling and reduced exceptional configurations in lattice QCD simulations.

Findings

n=4 FLIC action shows superior scaling to mean-field improvement

Reduced exceptional configuration problem with the FLIC action

Effective in calculating hadron masses with improved accuracy

Abstract

The hadron mass spectrum is calculated in lattice QCD using a novel fat-link clover fermion action in which only the irrelevant operators in the fermion action are constructed using smeared links. The simulations are performed on a 16^3 x 32 lattice with a lattice spacing of a=0.125 fm. We compare actions with n=4 and 12 smearing sweeps with a smearing fraction of 0.7. The n=4 Fat-Link Irrelevant Clover (FLIC) action provides scaling which is superior to mean-field improvement, and offers advantages over nonperturbative 0(a) improvement, including a reduced exceptional configuration problem.