CHARGE-SYMMETRY BREAKING VIA RHO-OMEGA-MIXING FROM MODEL QUARK-GLUON DYNAMICS

The quark-loop contribution to the rho(o)-omega mixing self-energy is calculated within a QCD-based model field theory in which the mesons a re composite qBARq bound states and the dressed quark propagator, obta ined from a model Dyson-Schwinger equation, is confining. In contrast to previous studies, the strength and range of the meson-qBARq vertex functions are produced within the model, and the off-mass-shell mixing behaviour includes the contribution from the diagonal meson self-ener gies. Although the mass-shell mixing is very sensitive to the small is ovector component of dynamical chiral symmetry breaking, the spacelike mixing still generates an insignificant charge symmetry breaking nucl ear force.