# Measurement of the Relative Branching Fractions for $B^- \to D/D^*/D^{**}(D^{(*)}_{\pi}) \ell^-\bar{\nu}_{\ell}$ with a Large Sample of Tagged B Mesons

Abstract : We present a study of B semileptonic decays into charm final states based on 211.7 fb^{-1} of data collected at the \Upsilon(4S) resonance with the babar detector at the pep2 e^+e^- storage ring. Using a novel technique based on the simultaneous fit of a set of variables reconstructed on the recoil of a B tagged in an hadronic decay mode, we measure the relative branching fractions \Gamma(B^- \to D^0\ell^- \bar{\nu}_{\ell}) / \Gamma(B^- \to D X \ell^- \bar{\nu}_{\ell}) = 0.210 \pm 0.017 (stat.) \pm 0.021 (syst.), \Gamma(B^- \to D^{*0}\ell^- \bar{\nu}_{\ell}) / \Gamma(B^- \to D X \ell^- \bar{\nu}_{\ell}) = 0.611 \pm 0.022 (stat.) \pm 0.027 (syst.) and \Gamma(B^- \to D^{**0}(D^{(*)}\pi)\ell^- \bar{\nu}_{\ell}) / \Gamma(B^- \to D X \ell^- \bar{\nu}_{\ell}) = 0.173 \pm 0.017 (stat.) \pm 0.021 (syst.).
Document type :
Conference papers

http://hal.in2p3.fr/in2p3-00119224
Contributor : Dominique Girod <>
Submitted on : Friday, December 8, 2006 - 11:01:02 AM
Last modification on : Saturday, May 22, 2021 - 3:33:40 AM

### Citation

B. Aubert, R. Barate, M. Bona, D. Boutigny, F. Couderc, et al.. Measurement of the Relative Branching Fractions for $B^- \to D/D^*/D^{**}(D^{(*)}_{\pi}) \ell^-\bar{\nu}_{\ell}$ with a Large Sample of Tagged B Mesons. 33rd International Conference on High-Energy Physics, ICHEP 06, Jul 2006, Moscou, Russia. ⟨in2p3-00119224⟩

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