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Phys. Rev. D 79, 012002 (2009) [20 pages]

Measurements of the semileptonic decays B̅ →Dℓν̅ and B̅ →D*ℓν̅ using a global fit to DXℓν̅ final states

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B. Aubert et al. BABAR Collaboration
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Received 8 September 2008; published 15 January 2009

Semileptonic B̅ decays to DXℓν̅ (ℓ=e or μ) are selected by reconstructing D0ℓ and D+ℓ combinations from a sample of 230×106 Υ(4S)→BB̅ decays recorded with the BABAR detector at the PEP-II e+e- collider at SLAC. A global fit to these samples in a three-dimensional space of kinematic variables is used to determine the branching fractions B(B-→D0ℓν̅ )=(2.34±0.03±0.13)% and B(B-→D*0ℓν̅ )=(5.40±0.02±0.21)% where the errors are statistical and systematic, respectively. The fit also determines form-factor parameters in a parametrization based on heavy quark effective theory, resulting in ρD2=1.20±0.04±0.07 for B̅ →Dℓν̅ and ρD*2=1.22±0.02±0.07 for B̅ →D*ℓν̅ . These values are used to obtain the product of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| times the form factor at the zero recoil point for both B̅ →Dℓν̅ decays, G(1)|Vcb|=(43.1±0.8±2.3)×10-3, and for B̅ →D*ℓν̅ decays, F(1)|Vcb|=(35.9±0.2±1.2)×10-3.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.79.012002
DOI:
10.1103/PhysRevD.79.012002
PACS:
13.25.Hw, 12.15.Hh, 11.30.Er
 
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