Bounds on Higgs and Gauge--Boson Interactions from LEP2 Data

Abstract

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 $SU(2{)}_L\otimes U(1{)}_Y$ effective Lagrangians, we examine all dimension--six operators that lead to anomalous Higgs interactions involving $\gamma$ and $Z$. The search for Higgs boson decaying to $\gamma \gamma$ pairs allow us to obtain constrains on these anomalous couplings that are comparable with the ones originating from the analyses of $p\bar{p}$ collisions at the Tevatron. Our results also show that if the coefficients of all ``blind'' operators are assumed to have same magnitude, the indirect constraints on the anomalous couplings obtained from this analyses, for Higgs masses $M_H\lesssim$ 140 GeV, are more restrictive than the ones coming from the $W^{+}{W}^{-}$ production.

14 pages Latex file using RevTeX, 3 figures as .eps files

References in corpus (2)

• Probing nonstandard bosonic interactions via W-boson pair production at lepton colliders
• Limits on Anomalous Couplings from Higgs Boson Production at the Tevatron

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