RADIATIVE DECAYS OF HIGGS BOSONS IN MINIMAL EXTENSIONS OF THE STANDARD MODEL

The radiative decay modes H --> gammagamma, gammaZ have been found to be viable at SSC/LHC for detection of an intermediate mass range Higgs boson expected in the standard model (SM). A precise measurement of t he decay widths of these modes may be used to distinguish among theori es beyond the SM. We present results obtained for the respective decay widths in minimal extensions of the SM: left-right symmetric models w ith a minimal Higgs potential, the minimal supersymmetric standard mod el, and SU(2) x U(1) invariant Lagrangians in which any new physics ap pears as nonrenormalizable, effective interactions. We conclude that o nly in the last case the SM decay widths for these radiative modes may be enhanced.