Electromagnetic splittings of hadrons from improved staggered quarks in full QCD

Details Electromagnetic splittings of hadrons from improved staggered quarks in full QCD Electromagnetic splittings of hadrons from improved staggered quarks in full QCD

2008-12-24

arxiv.org/abs/0812.4486v1

PoS LATTICE2008:127,2008

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 7 figures, presented at the XXVI International Symposium on Lattice Field Theory, July 14-19, 2008, Williamsburg, Vir

Scientific paper

We present our initial study of the electromagnetic splittings of charged and neutral mesons, and the violation of Dashen's theorem. Hadron masses are calculated on MILC N_f=2+1 QCD ensembles at lattice spacing \approx 0.15fm, together with quenched non-compact U(1) configurations. The O(a^2) tadpole improved staggered quark (asqtad) action is used both for the sea quarks and for six different valence quark masses. Chiral extrapolations are performed using partially quenched chiral perturbation theory incorporating electromagnetic corrections.

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