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We extend our previous study of taste-symmetry breaking using HYP-smearedstaggered fermions in two ways. First, we improve the statistics of acomparison of unimproved and HYP-smeared staggered fermions on quenchedlattices with $a\approx 0.1 $fm. This allows us to obtain a signal for all piontastes, rather than just a subset, and thus to make a complete comparison. Inaddition, it allows us to differentiate between wall and local sources. Second,we compare HYP-smeared valence quarks to asqtad valence quarks on 2+1 flavorunquenched MILC lattices. We find that taste breaking is substantially reducedby HYP-smearing, bringing the size of this discretization effect (which is thedominant such effect with staggered fermions) down to the size expectedgenerically for any fermion type.

Improvement of the pion spectrum with HYP-smeared staggered fermions