Electromagnetic Splittings and Light Quark Masses
Duncan, A. · Eichten, E. · Thacker, H.
Original · EN
A method for computing electromagnetic properties of hadrons in lattice QCD is described. 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. Preliminary results for vector meson splittings are also presented.
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