Complementary Observables for the Determination of V{sub ub} in Inclusive Semileptonic B Decays
The determination of |V{sub ub}| from inclusive semileptonic B decays is limited by uncertainties in modeling the decay distributions in b {yields} u{ell}{nu} transitions. The largest uncertainties arise from the limited knowledge of the appropriate b quark mass and Fermi momentum to use in the parameterization of the shape function. This paper presents a new method in which these shape function parameters are constrained by the same data used to measure |V{sub ub}|. The method requires measurements of the momenta of both the charged lepton and the neutrino in semileptonic B decays. From these quantities two complementary observables can be constructed, one for discriminating between b {yields} u{ell}{nu} transitions and background and the other for constraining the shape function. Using this technique the uncertainties in |V{sub ub}| from the shape function may be significantly reduced.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 799069
- Report Number(s):
- SLAC-PUB-9216; TRN: US0204420
- Resource Relation:
- Other Information: PBD: 14 May 2002
- Country of Publication:
- United States
- Language:
- English
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