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Pion and kaon physics with improved staggered quarks

2004; Elsevier BV; Volume: 129-130; Linguagem: Inglês

10.1016/s0920-5632(03)02538-6

1873-3832

Christopher Aubin, C. Bérnard, Carleton DeTar, Steven Gottlieb, Eric B. Gregory, Urs M. Heller, J. E. Hetrick, James C. Osborn, R. Sugar, D. Toussaint,

High-Energy Particle Collisions Research

We compute pseudoscalar meson masses and decay constants using staggered quarks on lattices with three flavors of sea quarks and lattice spacing ≈ 0.12 fm and ≈ 0.09 fm. We fit partially quenched results to "staggered chiral perturbation theory" formulae, thereby taking into account the effects of taste-symmetry violations. Chiral logarithms are observed. From the fits we calculate fπ and fϰ, extract Gasser-Leutwyler parameters of the chiral Lagrangian, and (modulo rather large perturbative errors) find the light and strange quark masses.