Measurement of |V cb | using the semileptonic decay $\overline{\rm {B^{0}_{d}}} \rightarrow {\rm D}^* \ell^- \overline{\nu}_{\ell}$

Autor: Nektarios Benekos, Clara Troncon, Sigve Haug, ALBERTO DE MIN, Nathalie Besson, Krzysztof Doroba, David Rodriguez Gonzalez, Filipe Veloso, Anna Lipniacka, Tommaso Tabarelli de Fatis, Lorenzo Vitale, Giuseppe Della Ricca, Francisco Javier Cuevas Maestro, Klaus Moenig, Maurizio Bonesini, Paolo Morettini, Mattias Ellert, Mariusz Witek, Barbara De Lotto, Oxana Smirnova, Philip Allport, Clara Matteuzzi, Pawel Bruckman de Renstrom, William Murray, Antonio Ferrer, Borut Kersevan, Ivo Van Vulpen, Nuno Castro, Daniel Jeans, Alessandro De Angelis, Bernardo Tomé, Andre Sopczak, Costa Mezquita, Agnieszka Zalewska, Ulrich Schwickerath, Markus Elsing, Bjarne Stugu, Javier Fernandez Menendez, Valerio Verzi, Jiri Chudoba, Andrei Sadovskiy, Katarzyna Grzelak, Tomasz Szumlak, Themistocles Bowcock, Piotr Zalewski, Mario Pimenta, Jesus Marco de Lucas, Carmen Garcia, Luiz Mundim, Nuno Anjos, Rupert Leitner, Leandro De Paula, Marco Paganoni, Patrice Verdier, Michal Bluj, Chris Parkes, Francisco Matorras, Alessandro Petrolini, Patrícia Gonçalves, Jan Ridky, Guillelmo Gomez-Ceballos, Petr Travnicek, Tadeusz Lesiak, Pedro T. Abreu, Arantza Oyanguren, Nicola Amapane, Christian Weiser, Guennadi Borissov, Jiri Rames
Rok vydání: 2004
Předmět:
Zdroj: The European Physical Journal C. 33:213-232
ISSN: 1434-6052
1434-6044
Popis: Data from Z decays in DELPHI have been searched for anti-B0d -> D*+ l- anti-nu_l with the D*+ decaying to D0 pi+ and D0 -> K- pi+, K- pi+ pi+ pi- or K- pi+ (pi0). These events are used to measure the CKM matrix element |V_cb| and the form factor slope, rho_{A_1}^2: F_D*(1)|Vcb| = 0.0392 +/- 0.0018 +/- 0.0023; rho_{A_1}^2 = 1.32 +/- 0.15 +/- 0.33 corresponding to a branching fraction: BR(anti-B0d -> D*+ l- anti-nu_l) = (5.90 +/- 0.22 +/- 0.50)%. Combining these and previous DELPHI measurements gives: F_D*(1)|Vcb| = 0.0377 +/- 0.0011 +/- 0.0019, rho_{A_1}^2 = 1.39 +/- 0.10 +/- 0.33 and BR(anti-B0d -> D*+ l- anti-nu_l) = (5.39 +/- 0.11 +/- 0.34)%. Using F_{D*}(1) = 0.91 +/- 0.04, yields: |Vcb| = 0.0414 +/- 0.0012(stat.) +/- 0.0021(syst.) +/- 0.0018(theory). The b-quark semileptonic branching fraction into a D*+ emitted from higher mass charmed excited states has also been measured to be: BR(b -> D*+ X l- anti-nu_l) = (0.67 +/- 0.08 +/- 0.10)%.
Databáze: OpenAIRE
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