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We present our initial study of the electromagnetic splittings of charged andneutral mesons, and the violation of Dashen's theorem. Hadron masses arecalculated 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) tadpoleimproved staggered quark (asqtad) action is used both for the sea quarks andfor six different valence quark masses. Chiral extrapolations are performedusing partially quenched chiral perturbation theory incorporatingelectromagnetic corrections.

Electromagnetic splittings of hadrons from improved staggered quarks in full QCD