Electromagnetic Splittings and Light Quark Masses in Lattice QCD
Abstract
A method for computing electromagnetic properties of hadrons in lattice QCD is described and preliminary numerical results are presented. The electromagnetic field is introduced dynamically, using a noncompact formulation. Employing enhanced electric charges, the dependence of the pseudoscalar meson mass on the (anti)quark charges and masses can be accurately calculated. At β=5.7 with Wilson action, the π+-π0 splitting is found to be 4.9(3) MeV. Using the measured K0-K+ splitting, we also find mu/md = .512(6). Systematic errors are discussed.
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