APPLICATIONS OF EFFECTIVE LAGRANGIANS TO WEAK RADIATIVE DECAYS

Using the effective Lagrangian approach we study the weak radiative pr ocesses H-0 --> gamma gamma, mu --> e gamma, tau --> mu gamma, e gamma and b --> s gamma. We assume that the full theory is perturbatively r enormalizable and that nonrenormalizable interactions respects the sym metry of the standard model. We consider only those contributions gene rated at lowest level in the perturbative full theory. We find that th e effects due to new physics may enhance the H --> gamma gamma SM deca y width and its production in gamma gamma colliders up to one order of magnitude. We also get bounds on the fermion-number-nonconserving dec ays nu(i) --> nu(j) gamma and t --> c gamma as well on the anomalous e lectromagnetic couplings of the W boson and the t, c, u quarks.