Measurement of V-cb from the decay process (B)over-bar(0)-> D(*+)l(-)(nu)over-bar
| Autor: | DELPHI Collaboration, Alemany Fernández, Reyes, Cabrera Urbán, Susana, Castillo Giménez, María Victoria, Costa Mezquita, María José, Cortina Gil, Eduardo, Ferrer Soria, Antonio, Fuster Verdú, Juan A., García García, Carmen, Gil Botella, Inés, Hernández Rey, Juan José, Higón Rodríguez, Emilio, Oyanguren Campos, Arantza, Salt Cairols, José, Tortosa Martínez, Pablo |
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| Rok vydání: | 2001 |
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| Zdroj: | 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 RODERIC. Repositorio Institucional de la Universitat de Valéncia instname |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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