Measurements of the semileptonic decays B¯Dν¯ and B¯D*ν¯ using a global fit to DXν¯ final states

B. Aubert et al. (BABAR Collaboration)
Phys. Rev. D 79, 012002 – Published 15 January 2009

Abstract

Semileptonic B¯ decays to DXν¯ (=e or μ) are selected by reconstructing D0 and D+ combinations from a sample of 230×106 Υ(4S)BB¯ 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(BD0ν¯)=(2.34±0.03±0.13)% and B(BD*0ν¯)=(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 B¯Dν¯ and ρD*2=1.22±0.02±0.07 for B¯D*ν¯. 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 B¯Dν¯ decays, G(1)|Vcb|=(43.1±0.8±2.3)×103, and for B¯D*ν¯ decays, F(1)|Vcb|=(35.9±0.2±1.2)×103.

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  • Received 8 September 2008

DOI:https://doi.org/10.1103/PhysRevD.79.012002

©2009 American Physical Society

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Vol. 79, Iss. 1 — 1 January 2009

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