Measurement of V-cb from the decay process (B)over-bar(0)-> D(*+)l(-)(nu)over-bar
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Measurement of V-cb from the decay process (B)over-bar(0)-> D(*+)l(-)(nu)over-bar

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Measurement of V-cb from the decay process (B)over-bar(0)-> D(*+)l(-)(nu)over-bar

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DELPHI Collaboration; Alemany Fernández, Reyes; Cabrera Urbán, Susana Perfil; Castillo Giménez, María Victoria Perfil; Costa Mezquita, María José; Cortina Gil, Eduardo; Ferrer Soria, Antonio Perfil; Fuster Verdú, Juan A. Perfil; García García, Carmen Perfil; Gil Botella, Inés; Hernández Rey, Juan José Perfil; Higón Rodríguez, Emilio Perfil; Oyanguren Campos, Arantza Perfil; Salt Cairols, José Perfil; Tortosa Martínez, Pablo
This document is a artículoDate2001

Este documento está disponible también en : http://dx.doi.org/10.1016/S0370-2693(01)00569-X

Este documento está disponible también en : http://hdl.handle.net/10550/33783
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.

    DELPHI Collaboration Alemany, R. Cabrera, S. Castillo Giménez, María Victoria Costa Mezquita, María José Cortina, E. Ferrer Soria, Antonio Fuster Verdú, Juan A. García García, Carmen Gil, I. Hernández Rey, Juan José Higón Rodríguez, Emilio Oyanguren Campos, Arantza Salt Cairols, José ,Tortosa Martínez, Pablo, 2001 Measurement of V-cb from the decay process (B)over-bar(0)-> D(*+)l(-)(nu)over-bar Physics Letters B 510 1-4 55 74
http://dx.doi.org/10.1016/S0370-2693(01)00569-X

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