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We present the results of fits to recent asqtad data in the lightpseudoscalar sector using SU(2) partially-quenched staggered chiralperturbation theory. Superfine (a~0.06 fm) and ultrafine (a~0.045 fm) ensemblesare used, where light sea quark masses and taste splittings are small comparedto the strange quark mass. Our fits include continuum NNLO chiral logarithmsand analytic terms. We give preliminary results for the pion decay constant,SU(2) low-energy constants and the chiral condensate in the two-flavor chirallimit.

SU(2) chiral fits to light pseudoscalar masses and decay constants