Abstract
We have computed the Z 0 → Hγ decay width, where H can be either a scalar or pseudoscalar Higgs particle, in two Higgs doublet models. For the scalar Higgs we compare the result with standard model and show that there exists a domain of parameters such that the width is enhanced by one or two orders of magnitude. This requires a small charged Higgs mass ( M h < M w) as well as one large scalar boson mass ( M S1 ⪢ M S2). For the pseudoscalar case a comparison with Z → π 0γ is performed. Despite the phase space suppression the pseudoscalar Higgs decay mode can be much larger since it does not suffer from form factor suppression. In all calculations we respect the recent LEP limits and low energy constraints on Higgs masses.
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