Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-02-15
Phys.Rev.D50:2037-2047,1994
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, five figures appended after \end{document} as uu-encoded and compressed eps files, uses epsf, CERN-TH.7156/94
Scientific paper
10.1103/PhysRevD.50.2037
We apply the operator product expansion to resum the leading nonperturbative corrections to the endpoint region of the lepton spectrum in inclusive semileptonic $B\to X_q\,\ell\,\bar\nu$ decays, taking into account a finite quark mass $m_q$ in the final state. We show that both for $b\to c$ and $b\to u$ transitions, it is consistent to describe these effects by a convolution of the parton model spectrum with a fundamental light-cone structure function. The moments of this function are proportional to forward matrix elements of higher-dimension operators. The prospects for an extraction of the structure function from a measurement of the lepton spectrum are discussed.
Mannel Thomas
Neubert Matthias
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