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Enhanced subleading structure functions in semileptonic B decay by Adam K. Leibovich; Zoltan Ligeti; Mark B. Wise is a Physics and Astronomy article available to read on EtoBox.

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The charged lepton spectrum in semileptonic B → X u ν decay near maximal lepton energy receives important corrections from subleading structure functions that are formally suppressed by powers of QCD /m b but are enhanced by numerical factors. We investigate the series of higher order terms which smear over a region of width E ∼ QCD near the endpoint the contributions proportional to δ(Em b /2) times (i) the matrix element of the chromomagnetic operator, and (ii) four-quark operators. These contribute to the total rate at the few percent level, but affect the endpoint region much more significantly. Implications for the determination of |V ub | are discussed.

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Author

Adam K. Leibovich; Zoltan Ligeti; Mark B. Wise

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0370-2693)

Published

2002

Language

EN

Field

Physics and Astronomy (Physical Sciences)