2022 Impact factor 4.4
Particles and Fields

Eur. Phys. J. C 20, 51-62
DOI: 10.1007/s100520100653

Radiative corrections to the decay $H^+ \to W^+ A^0$

A.G. Akeroyd1, A. Arhrib2, 3 and E. Naimi2, 3

1  KEK Theory Group, Tsukuba, Ibaraki 305-0801, Japan
2  Département de Mathématiques, Faculté des Sciences et Techniques, B.P 416, Tanger, Morocco
3  UFR -High Energy Physics, Physics Departement, Faculty of Sciences, P.O. Box 1014, Rabat, Morocco

(Received: 17 July 2000 / Revised version: 28 February 2001 / Published online: 3 May 2001 -© Springer-Verlag / Società Italiana di Fisica 2001 )

Full one-loop electroweak corrections to the on-shell decay $H^+ \to W^+ A^0$ are computed in the framework of models with two Higgs doublets (THDM). Such a decay may be dominant for $H^{\pm}$ over a wide range of parameter space relevant at present and future colliders. We show that the corrections may approach $40\%$ and in particular are sensitive to $\lambda_5$, which parameterizes the discrete symmetry breaking term. We suggest that a measurement of the branching ratio of $H^+ \to W^+ A^0$ may offer a possibility of measuring the magnitude of $\lambda_5$.

© Società Italiana di Fisica, Springer-Verlag 2001