Content of the (3,3*) + (3*,3) model in the pole-dominance approximation

The content of the (3, 3*)+(3*, 3)-symmetry-breaking model (including isospin-violating interaction) is explored by using the spin-zero meson-dominance approximation for two- and three-point functions. By fully exploiting the pole-dominance approximation it is shown that a number of the assumptions made by Gell-Mann, Oakes, and Renner are unnecessary. The results indicate that the Hamiltonian is nearly SU(2)×SU(2)-symmetric and that a small isospin-violating interaction is present. One can conclude that (3, 3*)+(3*, 3)-symmetry-breaking models with Hamiltonians very different from this must contain large violations of pole dominance.