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Measurement and interpretation of moments in inclusive semileptonic decays B[over ¯]→X_{c}ℓ^{-}ν[over ¯]

Aubert, B. et al. (2010) Measurement and interpretation of moments in inclusive semileptonic decays B[over ¯]→X_{c}ℓ^{-}ν[over ¯]. Physical Review D, 81 (3). 032003. ISSN 1550-7998

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Abstract

We present results for the moments of observed spectra in inclusive semileptonic B-meson decays to charm hadrons B̅ →Xcℓ-ν̅ . Moments of the hadronic-mass and the combined mass-and-energy spectra for different minimum electron or muon momenta between 0.8 and 1.9 GeV/c are obtained from a sample of 232×106 Υ(4S)→BB̅ events, collected with the BABAR detector at the PEP-II asymmetric-energy B-meson factory at SLAC. We also present a reevaluation of the moments of electron-energy spectra and partial decay fractions B(B̅ →Xce-ν̅ ) for minimum electron momenta between 0.6 and 1.5 GeV/c based on a sample of 51×106 Υ(4S)→BB̅ events. The measurements are used for the extraction of the total decay fraction, the Cabibbo-Kobayashi-Maskawa (CKM) matrix element |Vcb|, the quark masses mb and mc, and four heavy-quark QCD parameters in the framework of a Heavy-Quark Expansion (HQE). We find B(B̅ →Xcℓ-ν̅ )=(10.64±0.17±0.06)% and |Vcb|=(42.05±0.45±0.70)×10-3.

Item Type: Article
Subjects: Q Science > QC Physics
Schools: School of Applied Sciences
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Depositing User: Sharon Beastall
Date Deposited: 15 Dec 2011 13:45
Last Modified: 15 Dec 2011 13:45
URI: http://eprints.hud.ac.uk/id/eprint/12204

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