Abstract
We have computed the O( alpha mt2/mw2) correction to the top-quark decay into a charged Higgs and a bottom quark in the minimal supersymmetric standard model. The analytic expression of such a correction to the decay width is given. The numerical results are also presented. For some favourable values of parameters, the correction implies up to approximately 5% reduction in the partial width relative to the tree-level result. Finally, we have compared the correction with the EW correction in the standard model.
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