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 BB̄ 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 B̄→DX-ν̄ decays to determine the contributions from the different channels. We measure Γ(B-→D-ν̄)/Γ(B-→DX-ν̄)=0.227±0. 014±0.016, Γ(B-→D*-ν̄)/Γ(B-→DX- ν̄)=0.582±0.018±0.030, and Γ(B-→D **-ν̄)/Γ(B-→DX-ν̄)=0.191±0. 013±0.019 for the charged B sample, and Γ(B0̄→D- ν̄)/Γ(B0̄→DX-ν̄)=0.215±0.016±0. 013, Γ(B0̄→D*-ν̄)/Γ(B0̄→DX- ν̄)=0.537±0.031±0.036, and Γ(B0̄→ D**-ν̄)/Γ(B0̄→DX-ν̄)=0.248±0. 032±0.030 for the neutral B sample, where uncertainties are statistical and systematic, respectively.

Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J., Poireau, V., et al. (2007). Measurement of the relative branching fractions of B̄→D/D*/ D**l-ν̄l decays in events with a fully reconstructed B meson. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 76(5) [10.1103/PhysRevD.76.051101].

Measurement of the relative branching fractions of B̄→D/D*/ D**l-ν̄l decays in events with a fully reconstructed B meson

Carpinelli M;
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 BB̄ 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 B̄→DX-ν̄ decays to determine the contributions from the different channels. We measure Γ(B-→D-ν̄)/Γ(B-→DX-ν̄)=0.227±0. 014±0.016, Γ(B-→D*-ν̄)/Γ(B-→DX- ν̄)=0.582±0.018±0.030, and Γ(B-→D **-ν̄)/Γ(B-→DX-ν̄)=0.191±0. 013±0.019 for the charged B sample, and Γ(B0̄→D- ν̄)/Γ(B0̄→DX-ν̄)=0.215±0.016±0. 013, Γ(B0̄→D*-ν̄)/Γ(B0̄→DX- ν̄)=0.537±0.031±0.036, and Γ(B0̄→ D**-ν̄)/Γ(B0̄→DX-ν̄)=0.248±0. 032±0.030 for the neutral B sample, where uncertainties are statistical and systematic, respectively.
Articolo in rivista - Articolo scientifico
BABAR detector
English
B. Aubert et al. (BABAR Collaboration)
Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J., Poireau, V., et al. (2007). Measurement of the relative branching fractions of B̄→D/D*/ D**l-ν̄l decays in events with a fully reconstructed B meson. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 76(5) [10.1103/PhysRevD.76.051101].
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