Baryon Octet Electromagnetic Form Factors in a confining NJL model

Electromagnetic form factors of the baryon octet are studied using a Nambu–Jona-Lasinio model which utilizes the proper-time regularization scheme to simulate aspects of colour confinement. In addition, the model also incorporates corrections to the dressed quarks from vector meson correlations in the t-channel and the pion cloud. Comparison with recent chiral extrapolations of lattice QCD results shows a remarkable level of consistency. For the charge radii we find the surprising result $r_E^p<r_E^{{\mathrm{\Sigma }}^{+}}$ and $\mathrm{\mid }{r}_E^n\mathrm{\mid }<\mathrm{\mid }{r}_E^{{\mathrm{\Xi }}^0}\mathrm{\mid }$, whereas the magnetic radii have a pattern largely consistent with a naive expectation based on the dressed quark masses.