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.
Cite
@article{arxiv.hep-lat/9602005,
title = {Electromagnetic Splittings and Light Quark Masses in Lattice QCD},
author = {A. Duncan and E. Eichten and H. Thacker},
journal= {arXiv preprint arXiv:hep-lat/9602005},
year = {2009}
}