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We calculate the light pseudoscalar decay constants, f_pi and f_K, and theirratio using domain wall valence quarks and 2+1 flavors of dynamical staggeredquarks. Use of the MILC gauge configurations allows us to simulate at severalsea quark masses and spatial volumes, and with two lattice spacings. We studyhow well our numerical lattice data for light decay constants and meson massesis described by next-to-leading order SU(3) mixed action chiral perturbationtheory and explain our strategy for the chiral and continuum extrapolation.Combining our result for f_K/f_pi with experimental measurements of pion andkaon leptonic decays allows a model-independent determination of |V_us|/|V_ud|;we find a preliminary value of |V_us|/|V_ud| = 0.2315(45)(7).

Light pseudoscalar meson masses and decay constants from mixed action lattice QCD