Novel fat-link fermion actions

TL;DR

This paper introduces a new fat-link clover fermion action for lattice QCD, which improves scaling and reduces discretization errors by using smeared links in irrelevant operators, tested on a 16^3 x 32 lattice.

Contribution

The paper proposes a novel fat-link fermion action with smeared links in irrelevant operators, demonstrating improved scaling over existing methods.

Findings

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

The approach offers advantages over nonperturbative O(a) improvement

Simulations performed at lattice spacing a=0.125 fm

Abstract

The hadron mass spectrum is calculated in lattice QCD using a novel fat-link clover fermion action in which only the irrelevant operators of 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 O(a) improvement.