Improvement via hypercubic smearing in triplet and sextet QCD

TL;DR

This paper demonstrates that hypercubic smearing in SU(3) lattice gauge theory significantly reduces discretization errors in fermion actions, improving the accuracy of non-perturbative calculations.

Contribution

It introduces a hypercubic smearing technique within the Wilson-clover fermion kernel to enhance non-perturbative improvement in SU(3) lattice gauge theories.

Findings

Discretization errors are substantially reduced with hypercubic smearing.

The estimated clover coefficient Csw indicates improved lattice action accuracy.

Smearing leads to more precise non-perturbative results in fundamental and sextet fermion representations.

Abstract

We study non-perturbative improvement in SU(3) lattice gauge theory coupled to fermions in the fundamental and two-index symmetric representations. Our lattice action is defined with hypercubic smeared links incorporated into the Wilson-clover fermion kernel. Using standard Schroedinger-functional techniques we estimate the clover coefficient Csw and find that discretization errors are much smaller than in thin-link theories.