Scaling behavior and sea quark dependence of pion spectrum with   HYP-smeared staggered fermions
  We study the pion spectrum (and in particular taste-symmetry breaking within it) using HYP-smeared valence staggered fermions on the coarse and fine MILC lattices (which have asqtad staggered sea quarks). We focus on the dependence on lattice spacing and sea-quark mass. We also update our results on source dependence. Our main conclusion is that on the MILC fine lattices the appropriate power-counting for SU(3) staggered chiral perturbation theory may have discretization errors entering at next-to-leading order rather than at leading-order. 
David Adams, Taegil Bae, Hyung-Jin Kim, Jongjeong Kim, Kwangwoo Kim,   Boram Yoon, Weonjong Lee, Chulwoo Jung, Stephen R. Sharpe