a rXiv:h ep-ph/93 7247v2 15 J ul 1993NSF-ITP-93-68TPI-MINN-93/33-T UMN-TH-1208/93July 1993Differential Distributions in Semileptonic Decays of the Heavy Flavors in QCD B.Blok 1Institute for Theoretical Physics University of California,Santa Barbara,CA 93106and L.Koyrakh 2,M.Shifman 3and A.I.Vainshtein 45Theoretical Physics Institute University of Minnesota,Minneapolis,MN 55455Abstract A generalization of the operator product expansion is used to find the dif-ferential distributions in the inclusive semileptonic weak decays of heavy flavors in QCD.In particular,the double distribution in electron energy andinvariant mass of the lepton pair is calculated.We are able to calculate the distributions in essentially model-independent way as a series in m −1Q where m Q is the heavy quark mass.All effects up to m −2Q are included.
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