Inclusive semileptonic B decays from QCD with NLO accuracy for power   suppressed terms
  We present the results of a calculation of the perturbative QCD corrections for the semileptonic inclusive width of a heavy flavored meson. Within the Heavy Quark Expansion we analytically compute the QCD correction to the coefficient of power suppressed contribution of the chromo-magnetic operator in the limit of vanishing mass of the final state quark. The important phenomenological applications are decays of bottom mesons, and to the less extend, charmed mesons. 
Thomas Mannel, Alexei A. Pivovarov and Denis Rosenthal
hep-ph