Instantons and the end point of the lepton energy spectrum in charmless semileptonic {ital B} decays
- Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218 (United States)
A recent calculation by Chay and Rey has shown that instantons may make a significant contribution to the lepton energy spectrum near its end point. 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 in radiative {ital B} decays. We find, in general, that this universality may well fail unless the spectrum is smeared over a region which is considerably larger than had previously been thought necessary. This result affects the possibility of performing a reliable measurement of {ital V}{sub {ital u}{ital b}} using inclusive decays.
- DOE Contract Number:
- FG02-94ER40869
- OSTI ID:
- 118545
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 9 Vol. 52; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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