1081 articles – 5254 Notices  [english version]
 HAL : in2p3-00007861, version 1
 arXiv : hep-ex/0008016
 Physics Letters B 492 (2000) 275-287
 Measurement of the $\bar{B}^{0}$ and $B^{-}$ Meson Lifetimes
 ALEPH Collaboration(s)
 (2000)
 The lifetimes of the B0 and B- mesons are measured using a sample of about four million hadronic Z decays collected from 1991 to 19 95 with the ALEPH detector at LEP. The data sample has been recently reprocessed, achieving a substantial improvement in the tracking performance. Semileptonic decays of B0 and B- mesons are partially reconstructed by identifying events containing a lepton with an associated D* or D0 meson. The proper time of the B meson is estimated from the measured decay length and the momentum of the D-lepton system. A fit to the proper time of 1880 D* l- and 2856 D0 l- candidates yields the following results: tau B0 = 1.518 +- 0.053 +- 0.034 ps, tau B- = 1.648 +- 0.049 +- 0.035 ps, tau B- / tau B0 = 1.085 +- 0.059 +- 0.018.
 Thème(s) : Physique/Physique des Hautes Energies - Expérience
 Lien vers le texte intégral : http://fr.arXiv.org/abs/hep-ex/0008016
 in2p3-00007861, version 1 http://hal.in2p3.fr/in2p3-00007861 oai:hal.in2p3.fr:in2p3-00007861 Contributeur : Magali Damoiseaux <> Soumis le : Vendredi 19 Janvier 2001, 12:36:52 Dernière modification le : Mardi 4 Juillet 2006, 16:16:55