We present the results of fits to recent asqtad data in the light pseudoscalar sector using SU(2) partially-quenched staggered chiral perturbation theory. Superfine (a~0.06 fm) and ultrafine (a~0.045 fm) ensembles are used, where light sea quark masses and taste splittings are small compared to the strange quark mass. Our fits include continuum NNLO chiral logarithms and analytic terms. We give preliminary results for the pion decay constant, SU(2) low-energy constants and the chiral condensate in the two-flavor chiral limit.
@article{arxiv.0911.0472,
title = {SU(2) chiral fits to light pseudoscalar masses and decay constants},
author = {A. Bazavov and C. Bernard and C. DeTar and X. Du and W. Freeman and Steven Gottlieb and Urs M. Heller and J. E. Hetrick and J. Laiho and L. Levkova and M. B. Oktay and J. Osborn and R. Sugar and D. Toussaint and R. S. Van de Water},
journal= {arXiv preprint arXiv:0911.0472},
year = {2010}
}