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We derive the lepton spectrum in semileptonic beauty decays from anonperturbative treatment of QCD; it is based on an expansion in $1/m_Q$ with$m_Q$ being the heavy flavour quark mass. The leading corrections arising onthe $1/m_Q$ level are completely expressed in terms of the difference in themass of the heavy hadron and the quark. Nontrivial effects appear in $1/m_Q^2$terms affecting mainly the endpoint region; they are different for meson andbaryon decays as well as for beauty and charm decays.Comment: 6 pages (3 figures are not included), Latex, UND-HEP-93-BIG01,  TPI-MINN-93/12-T, UMN-TH-1149/9

QCD predictions for lepton spectra in inclusive heavy flavor decays