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

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arxiv 0911.0472 v1 pith:TGYFV5NT submitted 2009-11-03 hep-lat

A. Bazavov , C. Bernard , C. DeTar , X. Du , W. Freeman , Steven Gottlieb , Urs M. Heller , J.E. Hetrick
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J. Laiho L. Levkova M.B. Oktay J. Osborn R. Sugar D. Toussaint R.S. Van de Water (The MILC Collaboration)
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classification hep-lat
keywords chiralfitslightconstantsdecaymassespseudoscalarquark
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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.

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