Baryon masses in large Nc chiral perturbation theory

Abstract

We analyse the baryon mass spectrum in a framework which combines the 1/Nc expansion with chiral perturbation theory. Meson loop contributions involving the full SU(3) octet of pseudoscalar Goldstone bosons are evaluated, and the influence of explicit chiral and flavor symmetry breaking by non-zero and unequal quark masses is investigated. We also discuss sigma terms and the strangeness contribution to the nucleon mass.

Comments: 36 pages, REVTeX, epsfig.sty, 4 figures (7 eps files), to be published in EPJ A