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Phys. Rev. Lett. 93, 011803 (2004) [7 pages]

Determination of the Branching Fraction for BXcν Decays and of |Vcb| from Hadronic-Mass and Lepton-Energy Moments

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B. Aubert et al. BABAR Collaboration
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Received 12 April 2004; published 2 July 2004

We determine the inclusive BXcν branching fraction, Bcν, the Cabibbo-Kobayashi-Maskawa matrix element |Vcb|, and other heavy-quark parameters from a simultaneous fit to moments of the hadronic-mass and lepton-energy distributions in semileptonic B-meson decays, measured as a function of the lower limit on the lepton energy, using data recorded with the BABAR detector. Using heavy-quark expansions (HQEs) to order 1/mb3, we extract Bceν=(10.61±0.16exp±0.06HQE)% and |Vcb|=(41.4±0.4exp±0.4HQE±0.6th)×10-3. The stated errors refer to the experimental, HQE, and additional theoretical uncertainties.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.011803
DOI:
10.1103/PhysRevLett.93.011803
PACS:
13.25.Hw, 11.30.Er, 12.15.Hh, 12.39.Hg