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We study the pion spectrum (and in particular taste-symmetry breaking withinit) using HYP-smeared valence staggered fermions on the coarse and fine MILClattices (which have asqtad staggered sea quarks). We focus on the dependenceon lattice spacing and sea-quark mass. We also update our results on sourcedependence. Our main conclusion is that on the MILC fine lattices theappropriate power-counting for SU(3) staggered chiral perturbation theory mayhave discretization errors entering at next-to-leading order rather than atleading-order.

Scaling behavior and sea quark dependence of pion spectrum with HYP-smeared staggered fermions