Measurement of the branching fractions for Bbar --> D pi l- nu-bar and Bbar --> D* pi l- nu-bar

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  • 13 July 2005
Abstract
We report on a measurement of the branching fractions for Bbar --> D(*) pi l- nu-bar decays in a 275 million BBbar sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB e+e- asymmetric collider. Events are tagged by fully reconstructing one of the B mesons in hadronic decay modes. We obtain the following branching fractions: Br(B- --> D+ pi- l- nu-bar) = (0.54 +/- 0.07(stat) +/- 0.07(syst) +/- 0.06(BR)) x 10^-2, Br(B- --> D*+ pi- l- nu-bar) = (0.67 +/- 0.11(stat) +/- 0.09(syst) +/- 0.03(BR)) x 10^-2, Br(B0bar --> D0 pi+ l- nu-bar) = (0.33 +/- 0.06(stat) +/- 0.06(syst) +/- 0.03(BR)) x 10^-2, Br(B0bar --> D*0 pi+ l- nu-bar) = (0.65 +/- 0.12(stat) +/- 0.08(syst) +/- 0.05(BR)) x 10^2, where the third error comes from the error on Bbar --> D(*) l- nu-bar decays. The contributions from B0bar --> D*+ l- nu-bar decays are excluded in the measurement of B0bar --> D0 pi+ l- nu-bar decays.

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