Measurements of the semileptonic decays B-bar-->Dl nu -bar and B-bar-->D*l nu -bar using a global fit to DXl nu -bar final states
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Aubert-2009-Measurements of the.pdf
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Author(s)
Fisher, Peter H.
Cowan, Ray Franklin
Dujmic, Denis
Koeneke, Karsten
Sciolla, Gabriella
Spitznagel, M.
Taylor, Frank E.
Yamamoto, R. K.
Zhao, M.
Alternative Title
Measurements of the semileptonic decays B̅ →Dℓν̅ and B̅ →D*ℓν̅ using a global fit to DXℓν̅ final states
Date Issued
January 2009
Journal
Physical Review D
Publisher
American Physical Society
Citation
BABAR Collaboration et al. “Measurements of the semileptonic decays B-bar-->Dl nu -bar and B-bar-->D*l nu -bar using a global fit to DXl nu -bar final states.” Physical Review D 79.1 (2009): 012002. © 2009 The American Physical Society.
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.79.012002
