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

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.

16 pages of LaTex ,22 postscript figures NOT included (sorry, postscript files available on request from [email protected]) Edinburgh preprint: 92/513, Liverpool: LTH 302, Southampton: SHEP 92/93-9. Accepted for publication by Phys. Rev. D