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Decay H^+ -> W^+ gamma in a nonlinear R_xi-gauge

J. Hernandez-Sanchez·M. A. Perez·G. Tavares-Velasco·J. J. Toscano
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Abstract

A new evaluation of the charged Higgs boson decay $H^+ -> W^+γ$ is presented in the context of the general two-Higgs doublet model. A nonlinear $R_ξ$-gauge which considerably simplifies the calculation is introduced and simple expressions are obtained for the fermionic and bosonic contributions. The $H^+ -> W^+γ$ branching ratio is analyzed for several values of the parameters of the model. Although this decay can have a branching fraction as large as $10^{-4}$ in a certain region of the parameter space, it is found that such a region is disfavored by the most recent constraints on $b -> sγ$, $g-2$ of the muon, $Z -> b \bar b$, and the $ρ$ parameter, along with the exclusions from direct searches at the CERN $e^-e^+$ LEP collider. The possibility of detecting this decay at future colliders is discussed.

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J. Hernandez-Sanchez, M. A. Perez, G. Tavares-Velasco, J. J. Toscano. 2004-02-27. Decay H^+ -> W^+ gamma in a nonlinear R_xi-gauge. https://doi.org/10.1103/physrevd.69.095008

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