Complete set of electromagnetic corrections to the nucleon mass in the Nambu-Jona-Lasinio model

Abstract

We show how to derive the complete set of electromagnetic corrections to the Nambu-Jona-Lasinio (NJL) model of the nucleon. Our results enable an accurate estimate of the electromagnetic contribution to the neutron-proton mass difference within this model. At the same time, our procedure demonstrates the way to calculate the complete set of meson corrections to the NJL model that maintains chiral symmetry.

Comments: Contribution to Proceedings, KEK-Tanashi International Symposium on Physics of Hadrons and Nuclei, 14-17 December 1998, Tokyo, Japan, to be published in Nuclear Physics A. 5 pages, revtex, epsf, 2 postscript figures. Minor addition to last figure, typos corrected