298 articles – 2329 Notices  [english version]
 HAL : in2p3-00011477, version 1
 arXiv : hep-ex/0107057
 International Symposium on Lepton and Photon Interactions at High Energies 20 Lepton Photon 01, Rome : Italie
 Measurement of the branching fraction for $B^0 \rightarrow D^{*+}D^{*-}$
 BABAR Collaboration(s)
 (2001)
 Decays of the type B --> D^{(*)} anti-D^{(*)} can be used to provide a measurement of the parameter sin2beta of the Unitarity Triangle that is complementary to the measurement derived from the mode B^0 --> J/psi K_s^0. In this document we report a measurement of the branching fraction for the decay B^0 --> D^{*+}D^{*-} with the BABAR detector. With data corresponding to an integrated luminosity of 20.7 fb^{-1} collected at the Upsilon(4S) resonance during 1999-2000, we have reconstructed 38 candidate signal events in the mode B^0 --> D^{*+}D^{*-} with an estimated background of 6.2+/-0.5 events. From these events, we determine the branching fraction to be BF(B^0 --> D^{*+}D^{*-}) = (8.0+/-1.6(stat)+/-1.2(syst))x10^{-4} (preliminary).
 Thème(s) : Physique/Physique des Hautes Energies - Expérience
 Lien vers le texte intégral : http://fr.arXiv.org/abs/hep-ex/0107057
 in2p3-00011477, version 1 http://hal.in2p3.fr/in2p3-00011477 oai:hal.in2p3.fr:in2p3-00011477 Contributeur : Nicole Berger <> Soumis le : Vendredi 3 Mai 2002, 11:20:10 Dernière modification le : Vendredi 3 Mai 2002, 11:20:10