Eur. Phys. J. C (1998) 1: 163-175
https://doi.org/10.1007/BF01245806

The Higgs-photon-Z boson coupling revisited

¹ 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

Received: 23 February 1997
Published online: 27 February 2005

Abstract

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.