Measurement of the Relative Branching Fractions for B- -> D/D*/D**(D(*)pi) l- anti-nu with a Large Sample of Tagged B Mesons
The BABAR Collaboration · Aubert, B.
Original · EN
We present a study of B semileptonic decays into charm final states based on 211.7 fb⁻¹ of data collected at the Υ(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 Γ(B- → D⁰ℓ- νℓ) / Γ(B- → D X ℓ- νℓ) = 0.210 ± 0.017 (stat.) ± 0.021 (syst.), Γ(B- → D*⁰ℓ- νℓ) / Γ(B- → D X ℓ- νℓ) = 0.611 ± 0.022 (stat.) ± 0.027 (syst.) and Γ(B- → D**⁰(D⁽*⁾π)ℓ- νℓ) / Γ(B- → D X ℓ- νℓ) = 0.173 ± 0.017 (stat.) ± 0.021 (syst.).
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