出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We calculate the light pseudoscalar decay constants, fp 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 quarkmasses 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/ fp
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).
