We calculate the light pseudoscalar decay constants, fπ and fK, and their ratio using domain wall valence quarks and 2+1 flavors of dynamical staggered quarks. Use of the MILC gauge configurations allows us to simulate at several sea quark masses and spatial volumes, and with two lattice spacings. We study how well our numerical lattice data for light decay constants and meson masses is described by next-to-leading order SU(3) mixed action chiral perturbation theory and explain our strategy for the chiral and continuum extrapolation. Combining our result for fK/ fπ with experimental measurements of pion and kaon leptonic decays allows a model-independent determination of |Vus|/|Vud|; we find a preliminary value of |Vus|/|Vud| = 0.2315(45)(7).
|Original language||English (US)|
|Journal||Proceedings of Science|
|State||Published - Jan 1 2008|
|Event||26th International Symposium on Lattice Field Theory, LATTICE 2008 - Williamsburg, United States|
Duration: Jul 14 2008 → Jul 19 2008
ASJC Scopus subject areas