ANOMALOUS HIGGS-BOSON PRODUCTION AND DECAY

A non-standard symmetry breaking sector may lead to derivative couplin gs of the Higgs boson and thereby to anomalous interactions with the e lectroweak gauge bosons. In the framework of gauge-invariant effective Lagrangians the resulting changes in Higgs boson production and decay mechanisms are related to anomalous triple vector boson couplings. Us ing low energy constraints on the dimension-six operators in the effec tive Lagrangian, we discuss the size of deviations from SM predictions which may be expected in Higgs boson production and decay rates. Larg e enhancements are allowed e.g. in the Z --> Hgamma and H --> gammagam ma partial decay widths, leading to Z --> gammagammagamma events at LE P.