BOUNDS ON HIGGS AND GAUGE-BOSON INTERACTIONS FROM LEP2 DATA

We derive bounds on Higgs and gauge-boson anomalous interactions using the LEP2 data on the production of three photons and photon pairs in association with hadrons. In the framework of SU(2)(L) x U(1)(Y) effec tive Lagrangians, we examine all dimension-six operators that lead to anomalous Higgs interactions involving gamma and Z. The search for Hig gs boson decaying to yy pairs allow us to obtain constrains on these a nomalous couplings that are comparable with the ones originating from the analysis of <p(p)over bar> collisions at the Tevatron. Our results also show that if the coefficients of all ''blind'' operators are ass umed to have the same magnitude, the indirect constraints on the anoma lous couplings obtained from this analysis, for Higgs masses M-H less than or similar to 140 GeV, are more restrictive than the ones coming from the W+W- production. (C) 1998 Elsevier Science B.V. All rights re served.