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Phys. Rev. Lett. 71, 496–499 (1993)

QCD predictions for lepton spectra in inclusive heavy flavor decays

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I. I. Bigi, M. Shifman, N. G. Uraltsev, and A. Vainshtein
Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556
Theoretical Physics Institute, University of Minnesota, Minneapolis, Minnesota 55455
St. Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg 188 350, Russia
Budker Institute of Nuclear Physics, Novosibirsk 630 090, Russia

Received 5 April 1993; published in the issue dated 26 July 1993

We derive the lepton spectrum in semileptonic b decays from a nonperturbative treatment of QCD; it is based on an expansion in 1/mQ with mQ being the heavy flavor quark mass. The leading corrections arising on the 1/mQ level are completely expressed in terms of the difference in the mass of the heavy hadron and the quark. Nontrivial effects appear in 1/mQ2 terms affecting mainly the end-point region; they are different for meson and baryon decays as well as for bottom and charm decays.

© 1993 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.71.496
DOI:
10.1103/PhysRevLett.71.496
PACS:
13.20.Jf, 12.38.Lg
 
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