One-Loop Contributions for A0 → ℓℓ̄V with ℓ ≡ e, μ and V ≡ γ , Z in Higgs Extensions of the Standard Model

Abstract

Abstract We present one-loop formulas for the decay of the CP-odd Higgs $A^0 \rightarrow \ell \bar{\ell } V$ with $\ell \equiv e, \mu$ and $V\equiv \gamma , Z$ in Higgs extensions of the Standard Model, considering a two Higgs doublet model with an extra complex (and real) scalar, a two Higgs doublet model as well as a triplet Higgs model. Analytic results for one-loop amplitudes are expressed in terms of the basic Passarino–Veltman functions following the standard notations of LoopTools. As a result, physical results can be generated numerically by using the package. In the phenomenological results, the total decay widths and the differential decay rates with respect to the invariant mass of a lepton pair are analyzed for two typical models such as the two Higgs doublet model and the triplet Higgs model.