Measurement of |V_cb| and the form-factor slope for Bbar -> D l^- nubar_l decays on the recoil of fully reconstructed B mesons

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dc.creatorThe BABAR Collaboration
dc.creatorAubert, B.
dc.date2008-07-31
dc.date.accessioned2026-07-07T09:53:57Z
dc.date.available2026-07-07T09:53:57Z
dc.descriptionWe present a measurement of the CKM matrix element |V_cb| and the form-factor slope rho^2 for Bbar -> D l^- nubar_l decays based on 417 fb-1 of data collected at the Upsilon(4S) resonance with the BaBar detector. The semileptonic decays are selected in BBar events in which the hadronic decay of the second B meson is fully reconstructed. From the measured differential decay rate of the signal decay we determine G(1) |V_cb|= (43.0 +/- 1.9 +/- 1.4) x 10^-3, rho^2 = 1.20 +/- 0.09 +/- 0.04, where G(1) is the hadronic form factor at the point of zero recoil. Using a lattice calculation for G(1) we extract |V_cb|= (39.8 +/- 1.8 +/- 1.3 +/- 0.9) x 10^-3, where the stated errors refer to the statistical, systematic, and form factor uncertainties. We also present a measurement of the exclusive branching fractions, BF(B^- -> D^0 l^- nubar_l) = (2.31 +/- 0.08 +/- 0.07)% and BF (B0bar -> D^+ l^- nubar_l)=(2.23 +/- 0.11 +/- 0.08)%.
dc.description18 pages, 5 postscript figures, submitted to ICHEP 2008
dc.identifierhttps://arxiv.org/abs/0807.4978
dc.identifierhttp://arxiv.org/abs/0807.4978
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/166137
dc.subjectHigh Energy Physics - Experiment
dc.titleMeasurement of |V_cb| and the form-factor slope for Bbar -> D l^- nubar_l decays on the recoil of fully reconstructed B mesons
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