The Higgs-photon-Z boson coupling revisited
Physique Mathématique et Théorique, UPRES-A 5032, Université de Montpellier II, F-34095, Montpellier Cedex 5, France
2 Institut für Theoretische Physik, Universität Karlsruhe, D-76128, Karlsruhe, Germany
Published online: 27 February 2005
We analyze the coupling of CP-even and CP-odd Higgs bosons to a photon and a Z boson in extensions, of the Standard Model. In particular, we study in detail the effect of charged Higgs bosons in two-Higgs doublet models;. and the contribution of SUSY particle loops in the minimal supersymmetric extension of the Standard Model: The Higgs-γZ coupling can be measured in the decayZ → γ+Higgs ate + e − colliders running on theZ resonance, or in the reverse process Higgs →Zγ with the Higgs boson produced at LHC. We show that a measurement of this coupling with a precision at the percent level, which could be the case at futuree + e − colliders, would allow to distinguish between the lightest SUSY and standard Higgs bosons in large areas of the parameter space.
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