Perturbative corrections to power suppressed effects in semileptonic B decays

Abstract

We compute the O(α s ) corrections to the Wilson coefficient of the chromomagnetic operator in inclusive semileptonic B decays. The results are employed to evaluate the complete $ {{{{\alpha-s}\Lambda- {\mathrm{QCD}} 2}} \left/ {{m-b 2}} \right.} $ correction to the semileptonic width and to the first moments of the lepton energy distribution. © 2014 The Author(s).