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We study the nucleon, Sigma and cascade octet baryon electromagnetic formfactors and the effects of SU(3) flavor symmetry breaking from 2+1-flavorlattice calculations. We find that electric and magnetic radii are similar; themaximum discrepancy is about 10%. In the pion-mass region we explore, both thequark-component and full-baryon moments have small SU(3) symmetry breaking. Weextrapolate the charge radii and the magnetic moments using three-flavorheavy-baryon chiral perturbation theory (HBXPT). The systematic errors due tochiral and continuum extrapolations remain significant, giving rise to chargeradii for $p$ and $\Sigma^-$ that are 3--4 standard deviations away from theknown experimental ones. Within these systematics the predicted $\Sigma^+$ and$\Xi^-$ radii are 0.67(5) and 0.306(15) fm$^2$ respectively. When thenext-to-next-to-leading order of HBXPT is included, the extrapolated magneticmoments are less than 3 standard deviations away from PDG values, and thediscrepancy is possibly due to remaining chiral and continuum extrapolationerrors.

Strange Baryon Electromagnetic Form Factors and SU(3) Flavor Symmetry Breaking