ELECTROMAGNETIC STRUCTURE OF LIGHT BARYONS IN LATTICE QCD

A method in which electromagnetic properties of hadrons are studied by direct simulation of dynamical photon effects is applied to the extra ction of the isomultiplet structure of the octet baryons. Using 187 co nfigurations at beta = 5.7 with Wilson action, and up and down quark m asses determined from the meson spectrum, the nucleon splitting is fou nd to be 1.55(+/-0.56 stat) MeV; the hyperon splittings are found to b e Sigma(0) - Sigma(+) = 2.47 +/- 0.39, Sigma(-) - Sigma(0) = 4.63 +/- 0.36, Xi(-) - Xi(0) = 5.68 +/- 0.24 MeV. Estimated systematic correcti ons arising from finite volume and the quenched approximation are incl uded in these results.