Inclusive semitauonic B decays to order O(ΛQCD3/mb3)

Abstract

We calculate the decay width and the τ-lepton energy distribution as well as relevant moments for inclusive B¯→Xcτν¯τ process including power corrections up to order ΛQCD3/mb3 and QCD corrections to the partonic level. We compare the result with the sum of the standard-model predictions of the branching fractions of the exclusive semileptonic B¯→(D,D⁎,D⁎⁎)τν¯τ decays as well as with the relevant experimental data. Our prediction is in agreement with the LEP measurement and is consistent with the standard-model calculation of the exclusive modes. We discuss the impact from physics beyond the Standard Model.