Isospin violating mass differences of baryons and hadronic loops

Abstract

Isospin violating mass splittings of the ground state baryons are discussed within the frame-work of the unitarized quark model. It is shown that the long-distance, nonperturbative unitarity effects are important, and that a good agreement with the observed mass splittings can be retained. The importance of six mass sum rules which hold independently of dynamical assumptions is emphasized.