GAMMA-GAMMA-]PI-PI AND VV IN THE CONSTITUENT QUARK-MODEL

Low-energy hadronic interactions are modelled by applying perturbation theory to the constituent quark model. Applications are made to I = 2 pi pi scattering, the f(1)(1420), and to gamma gamma --> pi pi and VV. The latter two processes provide a good laboratory for testing hadronic interactions in the final state. It is shown that pi pi data may be successfully reproduced in a simple model. The model also predicts the approximate equality of sigma(gamma gamma --> rho(0) phi) and sigma(gamma gamma --> omega phi). Finally, we comment on the possibility of obtaining the observed ratios of sigma(gamma gamma --> rho(0) rho(0))/sigma(gamma gamma --> --> rho(r)ho(-)) and sigma(gamma gamma --> K*(+) K*(-)).