Weak annihilation and the end-point spectrum in semileptonic B decays
نویسندگان
چکیده
منابع مشابه
QCD corrections and the end point of the lepton spectrum in semileptonic B decays.
Recently, Neubert has suggested that a certain class of nonperturbative corrections dominates the shape of the electron spectrum in the endpoint region of semileptonic B decay. Perturbative QCD corrections are important in the endpoint region. We study the effects of these corrections on Neubert’s proposal. The connection between the endpoint of the electron spectrum in semileptonic B decay and...
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A recent calculation by Chay and Rey has shown that instantons may make a significant contribution to the lepton energy spectrum near its endpoint. Using an ansatz borrowed from the study of high energy baryon number violating processes, we investigate whether these corrections could spoil the relation between the nonperturbative contributions to this spectrum and to the photon energy spectrum ...
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A class of meson decay modes sensitive to only one quark topology at leading GF order (annihilation of valence quarks through a W ) is described. No experimental observations, nor even upper limits, have been reported for these decays. This work presents a simpleminded (order-of-magnitude) calculation of their branching fractions, and compares to results of previous calculations where available...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 1994
ISSN: 0550-3213
DOI: 10.1016/0550-3213(94)90564-9