# Measurement of the Relative Branching Fractions of $\bar{B} \to D/D*/D** l^- \bar{nu}_l$ Decays in Events with a Fully Reconstructed B Meson

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 million BBbar pairs collected at the Upsilon(4S) resonance with the BaBar detector. A simultaneous fit to a set of discriminating variables is performed on a sample of Bbar --> D X l^- anti-nu_l decays to determine the contributions from the different channels. We measure Gamma(B- --> D l^- anti-nu_l)/Gamma (B- --> D X l^- anti-nu_l)= 0.227 +/- 0.014 +/- 0.016, Gamma(B- --> D* l^- anti-nu_l)/Gamma (B- --> D X l^- anti-nu_l)= 0.582 +/- 0.018 +/- 0.030 and Gamma(B- --> D** l^- anti-nu_l)/Gamma (B- --> D X l^- anti-nu_l)= 0.191 +/- 0.013 +/- 0.019 for the charged B sample, and Gamma(B0bar --> D l^- anti-nu_l)/Gamma (B0bar --> D X l^- anti-nu_l)= 0.215 +/- 0.016 +/- 0.013, Gamma(B0bar --> D* l^- anti-nu_l)/Gamma (B0bar --> D X l^- anti-nu_l)= 0.537 +/- 0.031 +/- 0.036 and Gamma(B0bar --> D** l^- anti-nu_l)/Gamma (B0bar --> D X l^- anti-nu_l)= 0.248 +/- 0.032 +/- 0.030 for the neutral B sample, where uncertainties are statistical and systematic, respectively.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00137966
Contributor : Claudine Bombar <>
Submitted on : Thursday, March 22, 2007 - 5:31:11 PM
Last modification on : Wednesday, September 16, 2020 - 4:20:31 PM

### Citation

B. Aubert, M. Bona, D. Boutigny, Y. Karyotakis, J.P. Lees, et al.. Measurement of the Relative Branching Fractions of $\bar{B} \to D/D*/D** l^- \bar{nu}_l$ Decays in Events with a Fully Reconstructed B Meson. Physical Review D, American Physical Society, 2007, 76, pp.051101. ⟨10.1103/PhysRevD.76.051101⟩. ⟨in2p3-00137966⟩

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