Broken charge symmetry in static strong coupling

Abstract

Standard perturbation techniques are applied to the study of the energy level splitting in the nucleon isobar states which results from introducing charge-symmetry violation. Whereas the scalar interaction model shows a high sensitivity to the symmetry breaking, the corresponding asymmetries are typically suppressed in the model with pseudoscalar mesons, owing to the interdependence of spin and isopin in the strong-coupling theory.