Polarization of tau leptons in semileptonic B decays

Abstract

Analytic formulae for the one-loop order QCD corrections to the differential width of the semileptonic b decay are given with the tau polarization taken into account. Thence the polarization of tau is expressed by its energy and the invariant mass of the tau + antineutrino system. The non-perturbative corrections by Falk et al. are incorporated in the calculation.

Comments: one footnote and one reference have been added; the paper is going to be published in Nucl. Phys. B