Abstract
The fourth rank polarization tensor and the helicity amplitudes of Z → 3γ via charged Higgs boson loops in some nonstandard models with more than one Higgs doublet are calculated by using a nonlinear Rξ gauge. The results are presented in terms of three transcendental functions of B(x), T(x) and I(x, y). We have checked the analytic results in Ref. [6] in comparison with ours.
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