Measurement of Br(Bbar -> D+l-nubar) and Determination of |Vcb|

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dc.creatorBelle Collaboration
dc.creatorAbe, K.
dc.date2001-11-26
dc.date2001-12-19
dc.date.accessioned2026-07-07T12:01:42Z
dc.date.available2026-07-07T12:01:42Z
dc.descriptionWe present a measurement of the branching fraction for the semileptonic B decay Bbar -> D+l-nubar, where l- can be either an electron or a muon. We find Gamma(Bbar -> D+l-nubar)= (13.79+/-0.76+/-2.51) ns^{-1}, and the resulting branching fraction Br(Bbar -> D+l-nubar)= (2.13 +/- 0.12 +/- 0.39)%, where the first error is statistical and the second systematic. We also investigate the Bbar -> D+l-nubar form factor and the implications of the result for |Vcb|. From a fit to the differential decay distribution we obtain the rate normalization |Vcb|F_D(1)= (4.11+/-0.44+/-0.52)x10^{-2}. Using a theoretical calculation of F_D(1), the Cabibbo-Kobayashi-Maskawa matrix element |Vcb|=(4.19+/-0.45+/-0.53+/-0.30)x10^{-2} is obtained, where the last error comes from the theoretical uncertainty of F_D(1). The results are based on a data sample of 10.2 fb^{-1} recorded at the Upsilon(4S)$ resonance with the Belle detector at the KEKB e+e- collider.
dc.description21pages, 5 figures, elsart.cls, to be published in PLB. In this version, the form factor comparison between B->Dlnu and D*lnu is included
dc.identifierhttps://arxiv.org/abs/hep-ex/0111082
dc.identifierhttp://arxiv.org/abs/hep-ex/0111082
dc.identifierPhys.Lett.B526:258-268,2002
dc.identifierdoi:10.1016/S0370-2693(01)01483-6
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/207182
dc.subjectHigh Energy Physics - Experiment
dc.titleMeasurement of Br(Bbar -> D+l-nubar) and Determination of |Vcb|
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