A new evaluation of the t->cH decay width in the standard model

Abstract

We present a new calculation of the t->cH decay rate in the standard model. We find that the corresponding branching fraction is B(t->cH) \sim 10^{-13} - 10^{-14} for M_Z < m_H < 2 M_W, that is about 6 orders of magnitude less than previously evaluated, and usually quoted in the literature.

12 pages, 5 figures, uses axodraw.sty. One reference added, to appear on Physics Letter B

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