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Measurement of the relative branching fractions of B¯D/D*/D**lν¯l decays in events with a fully reconstructed B meson

B. Aubert et al. (BABAR Collaboration)
Phys. Rev. D 76, 051101(R) – Published 4 September 2007

Abstract

We determine the relative branching fractions of semileptonic B decays to charmed final states. The measurement is performed on the recoil from a fully reconstructed B meson in a sample of 362×106 BB¯ pairs collected at the Υ(4S) resonance with the BABAR detector. A simultaneous fit to a set of discriminating variables is performed on a sample of B¯DXν¯ decays to determine the contributions from the different channels. We measure Γ(BDν¯)/Γ(BDXν¯)=0.227±0.014±0.016, Γ(BD*ν¯)/Γ(BDXν¯)=0.582±0.018±0.030, and Γ(BD**ν¯)/Γ(BDXν¯)=0.191±0.013±0.019 for the charged B sample, and Γ(B0¯Dν¯)/Γ(B0¯DXν¯)=0.215±0.016±0.013, Γ(B0¯D*ν¯)/Γ(B0¯DXν¯)=0.537±0.031±0.036, and Γ(B0¯D**ν¯)/Γ(B0¯DXν¯)=0.248±0.032±0.030 for the neutral B sample, where uncertainties are statistical and systematic, respectively.

  • Figure
  • Received 16 March 2007

DOI:https://doi.org/10.1103/PhysRevD.76.051101

©2007 American Physical Society

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Vol. 76, Iss. 5 — 1 September 2007

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