Measurement of V_{cb} from the decay process \bar{B^0} -> D^{*+} \ell^- \barν

Details Measurement of V_{cb} from the decay process \bar{B^0} -> D^{*+} \ell^- \barν Measurement of V_{cb} from the decay process \bar{B^0} -> D^{*+} \ell^- \barν

2001-04-13

arxiv.org/abs/hep-ex/0104026v2

Phys.Lett.B510:55-74,2001

Physics

High Energy Physics

High Energy Physics - Experiment

26 pages, 5 figures, Accepted by Phys. Lett. B; typo corrected, reference updated

Scientific paper

10.1016/S0370-2693(01)00569-X

A new precise measurement of |V_{cb}| and of the branching ratio BR(\bar{B^0} -> D^{*+} \ell^- \bar{\nu_\ell}) has been performed using a sample of about 5000 semileptonic decays \bar{B^0} -> D^{*+} \ell^- \bar{\nu_\ell}, selected by the DELPHI detector at LEP I by tagging the soft pion from D^{*+} -> D^0 \pi^+. The results are: V_{cb}=(39.0 +/- 1.5 (stat.) ^{+2.5}_{-2.6} (syst. exp.) +/- 1.3 (syst. th.)) x 10^{-3} BR(\bar{B^0} -> D^{*+} \ell^- \bar{\nu_\ell})=(4.70 +/- 0.13 (stat.) ^{+0.36}_{-0.31} (syst. exp.))% The analytic dependences of the differential cross-section and of the Isgur Wise form factor as functions of the variable w = v_{B^0}.v_{D^*} have also been obtained by unfolding the experimental resolution.

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