A new evaluation of the t->cH decay width in the standard model
  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. 
B. Mele, S. Petrarca, A. Soddu (Rome 1 U. and INFN, Rome 1)