Gauge-Invariant Smearing and Matrix Correlators using Wilson Fermions at beta=6.2

TL;DR

This paper introduces a gauge-invariant smearing technique for Wilson fermions in lattice QCD that improves baryon spectrum calculations and reveals excited states with minimal additional computational effort.

Contribution

The study develops a new smearing algorithm for Wilson fermions that enhances the accuracy of baryon spectrum measurements and excited state identification in lattice QCD.

Findings

Significant improvement in baryon spectrum determination.

Successful extraction of excited states of mesons and baryons.

Efficient smearing method with low computational cost.

Abstract

We present an investigation of gauge-invariant smearing for Wilson fermions in quenched lattice QCD on a $24^3 \times 48$ lattice at $\beta = 6.2$. We demonstrate a smearing algorithm that allows a substantial improvement in the determination of the baryon spectrum obtained using propagators smeared at both source and sink, at only a small computational cost. We investigate the matrix of correlators constructed from local and smeared operators, and are able to expose excited states of both the mesons and baryons.