PION LOOP CONTRIBUTION TO P-OMEGA MIXING AND MASS SPLITTING

We study the self-energy amplitudes for the rho-omega meson system pro duced by an effective held theory model at the quark level characteriz ed by a finite range quark-quark interaction and an isospin breaking b are quark mass difference m(u)-m(d). Dynamical effects associated with confinement and dressing of quarks and the finite size of the produce d (q) over bar q meson modes are treated. Parameters of this approach, previously constrained by soft pion physics, are here supplemented in a minimal way to reproduce m(omega) and g(rho pi pi). Calculations ar e carried out up to the one-pion-loop level and the predictions for rh o(0)-omega mixing, mass splitting, the rho width and the symmetry brea king omega pi pi coupling constant and form factor are presented. The contribution of the direct omega-->pi pi process relative to the omega -->rho-->pi pi process is discussed within this model.