I discuss the properties of pions in “partially quenched” theories, i.e. those in which the valence and sea quark masses, mV and mS, are different. I point out that for lattice fermions which retain… (More)

We discuss the phase diagram of Wilson fermions in the m0–g 2 plane for twoflavor QCD. We argue that, as originally suggested by Aoki, there is a phase in which flavor and parity are spontaneously… (More)

We study the leading discretization errors for staggered fermions by first constructing the continuum effective Lagrangian including terms of O(a2), and then constructing the corresponding effective… (More)

This talk summarizes results for all the scale independent renormalization constants for bilinear currents (ZA, ZV , and ZS/ZP ), the improvement constants (cA, cV , and cT ), the quark mass… (More)

We use the effective chiral Lagrangian to analyze the phase diagram of two-flavor twisted mass lattice QCD as a function of the normal and twisted masses, generalizing previous work for the untwisted… (More)

We calculate the kaon B-parameter, BK , to next-to-leading order in staggered chiral perturbation theory. We extend the usual power counting to include the effects of using perturbative (rather than… (More)

We present preliminary results for BK calculated using improved staggered fermions with a mixed action (HYP-smeared staggered valence quarks and AsqTad staggered sea quarks). We investigate the… (More)

This talk summarizes results for all the scale independent renormalization constants for bilinear currents (ZA, ZV , and ZS/ZP ), the improvement constants (cA, cV , and cT ), the quark mass… (More)

We presents results for the matrix elements of a variety of four-fermion operators calculated using quenched Wilson fermions. Our simulations are done on 170 lattices of size 32 × 64 at β = 6.0. We… (More)

We calculate the perturbative corrections to fermion bilinears that are used in numerical simulations when extracting weak matrix elements using staggered fermions. This extends previous calculations… (More)