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

Abstract

We calculate the light pseudoscalar decay constants, f_pi and f_K, 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 f_K/f_pi with experimental measurements of pion and kaon 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).

7 pages, 4 figures. Talk presented at Lattice 2008, Williamsburg, VA

References in corpus (5)

• Convergence of the chiral expansion in two-flavor lattice QCD
• Mixed Meson Masses with Domain-Wall Valence and Staggered Sea Fermions
• Discretization effects and the scalar meson correlator in mixed-action lattice simulations
• Three-Flavor Partially Quenched Chiral Perturbation Theory at NNLO for Meson Masses and Decay Constants
• Status of the MILC light pseudoscalar meson project

Cited by in corpus (6)

• Full nonperturbative QCD simulations with 2+1 flavors of improved staggered quarks
• Review of lattice results concerning low energy particle physics
• Pseudoscalar decay constants of kaon and D-mesons from Nf=2 twisted mass Lattice QCD
• The ratio FK/Fpi in QCD
• Kaon physics: a lattice perspective
• Review: The FLAG working group