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The European Physical Journal C
ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)
Abstract Volume 1 Issue 1/2 (1998) pp 163-175
theoretical physics:
The Higgs-photon-Z boson coupling revisited
A. Djouadi (1), V. Driesen (2), W. Hollik (2), A. Kraft (2)
(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
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-$\gamma Z$ coupling can be measured in the decay $Z \rightarrow \gamma$+Higgs at $e^+e^-$ colliders running on the $Z$ resonance, or in the reverse process Higgs $\rightarrow Z \gamma$ 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 future $e^+e^-$ colliders, would allow to distinguish between the lightest SUSY and standard Higgs bosons in large areas of the parameter space.
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Online publication: December 11, 1997
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