Quenched spectroscopy with fixed-point and chirally improved fermions

TL;DR

This paper reports quenched spectroscopy results using fixed-point and chirally improved fermions, demonstrating good chiral properties at small quark masses and analyzing meson and baryon masses, scaling, and finite volume effects.

Contribution

It introduces quenched spectroscopy calculations with approximate Ginsparg-Wilson solutions, enabling analysis at small quark masses with good chiral properties.

Findings

Quenching artifacts correlate with experimental widths.

Gauge and hadronic scales are consistent.

Results agree with recent large-scale simulations.

Abstract

We present results from quenched spectroscopy calculations with the parametrized fixed-point and the chirally improved Dirac operators. Both these operators are approximate solutions of the Ginsparg-Wilson equation and have good chiral properties. This allows us to work at small quark masses and we explore pseudoscalar-mass to vector-mass ratios down to 0.28. We discuss meson and baryon masses, their scaling properties, finite volume effects and compare our results with recent large scale simulations. We find that the size of quenching artifacts of the masses is strongly correlated with their experimentally observed widths and that the gauge and hadronic scales are consistent.