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 that r(E)(p) < r(E)(Sigma+) and vertical bar r(E)(n)vertical bar < vertical bar r(E)(Xi 0)vertical bar, whereas the magnetic radii have a pattern largely consistent with a naive expectation based on the dressed quark masses. (C) 2016 The Author(s). Published by Elsevier B.V.