QCD Corrections in Gamma_sl(B)
  Short-distance expansion of the total semileptonic B widths is reviewed for the OPE-conformable scheme employing low-scale running quark masses. The third- and fourth-order BLM corrections are given and the complete resummation of the BLM series presented. The effect of higher perturbative orders with running quark masses is found very small. Numerical consequences for |V_{cb}| are addressed. 
Nikolai Uraltsev