We extend MILC's initial study of the electromagnetic splitting of charged and neutral mesons, and the violation of Dashen's theorem. Meson masses are calculated using the MILC Nf = 2 + 1, asqtad SU(3) gauge configurations, and independently generated U(1) gauge configurations. The meson correlators are calculated using SU(3) ×U(1) gauge fields. A large fraction of the meson correlators are calculated using an implementation of the MILC staggered multi-mass inverter that runs on a single NVIDIA GPU in double precision. When the current analysis is complete, we will have results at three lattice spacings, from about 0.15 to 0.09 fm, with several light quark masses at each lattice spacing. Once electromagnetic effects are included in the corresponding rooted, staggered chiral perturbation theory calculations, we should have excellent control over the chiral and continuum limits.
|Original language||English (US)|
|Journal||Proceedings of Science|
|State||Published - 2010|
|Event||28th International Symposium on Lattice Field Theory, Lattice 2010 - Villasimius, Sardinia, Italy|
Duration: Jun 14 2010 → Jun 19 2010
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