Abstract
We study the nucleon, Sigma and cascade octet baryon electromagnetic form factors and the effects of SU(3) flavor symmetry breaking from $2+1$-flavor lattice calculations. We find that electric and magnetic radii are similar; the maximum discrepancy is about 10%. In the pion-mass region we explore, both the quark-component and full-baryon moments have small SU(3) symmetry breaking. We extrapolate the charge radii and the magnetic moments using three-flavor heavy-baryon chiral perturbation theory. The systematic errors due to chiral and continuum extrapolations remain significant, giving rise to charge radii for $p$ and ${\ensuremath{\Sigma}}^{\ensuremath{-}}$ that are 3--4 standard deviations away from the known experimental ones. Within these systematics the predicted ${\ensuremath{\Sigma}}^{+}$ and ${\ensuremath{\Xi}}^{\ensuremath{-}}$ radii are 0.67(5) and $0.306(15)\text{ }\text{ }{\mathrm{fm}}^{2}$, respectively. When the next-to-next-to-leading order of heavy-baryon chiral perturbation theory is included, the extrapolated magnetic moments are less than 3 standard deviations away from Particle Data Group values, and the discrepancy is possibly due to remaining chiral and continuum extrapolation errors.
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