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Measurement of |Vcb| and the Form-Factor Slope in B[over-bar] -->Dℓ-nu[over-bar] ℓ Decays in Events Tagged by a Fully Reconstructed B Meson

Author(s)
Fisher, Peter H.; Dujmic, Denis; Cowan, Ray Franklin; Henderson, Shawn Wesley; Sciolla, Gabriella; Spitznagel, M.; Yamamoto, R. K.; Zhao, M.; ... Show more Show less
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Alternative title
Measurement of |Vcb| and the Form-Factor Slope in B̅ →Dℓ-ν̅ ℓ Decays in Events Tagged by a Fully Reconstructed B Meson
Terms of use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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Abstract
We present a measurement of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| and the form-factor slope ρ2 in B̅ -->Dℓ-ν̅ ℓ decays based on 460×106 BB̅ events recorded at the Υ(4S) resonance with the BABAR detector. B̅ -->Dℓ-ν̅ ℓ decays are selected in events in which a hadronic decay of the second B meson is fully reconstructed. We measure B(B--->D0ℓ-ν̅ ℓ)/B(B--->Xℓ-ν̅ ℓ)=(0.255±0.009±0.009) and B(B̅ 0-->D+ℓ-ν̅ ℓ)/B(B̅ 0-->Xℓ-ν̅ ℓ)=(0.230±0.011±0.011), along with the differential decay distribution in B̅ -->Dℓ-ν̅ ℓ decays. We then determine G(1)|Vcb|=(42.3±1.9±1.4)×10-3 and ρ2=1.20±0.09±0.04, where G(1) is the hadronic form factor at the point of zero recoil.
Date issued
2010-01
URI
http://hdl.handle.net/1721.1/58099
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
BABAR Collaboration et al. “Measurement of |V_{cb}| and the Form-Factor Slope in B[over -bar]-->Dl^{-} nu [over -bar]_{l} Decays in Events Tagged by a Fully Reconstructed B Meson.” Physical Review Letters 104.1 (2010): 011802. ©2010 American Physical Society.
Version: Final published version
ISSN
0031-9007

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