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 Physics Letters B 492 (2000) 259-274
 Study of the CP asymmetry of B$^{0} \rightarrow$ J/$\psi$K$^{0}_{s}$ decays in ALEPH
 ALEPH Collaboration(s)
 (2000)
 The decay B0 -> J/psi K0_S is reconstructed with J/psi -> e+ e- or mu+ mu- and K0_S -> pi+ pi-. From the full ALEPH dataset at LEP1 of about 4 million hadronic Z decays, 23 candidates are selected with an estimated purity of 71%. They are used to measure the CP asymmetry of this decay, given by sin 2beta in the Standard Model, with the result sin 2beta = 0.84 +0.82-1.04 +-0.16. This is combined with existing measurements from other experiments, and increases the confidence level that CP violation has been observed in this channel to 98%.
 Thème(s) : Physique/Physique des Hautes Energies - Expérience
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 in2p3-00007884, version 1 http://hal.in2p3.fr/in2p3-00007884 oai:hal.in2p3.fr:in2p3-00007884 Contributeur : Nicole Berger <> Soumis le : Vendredi 12 Janvier 2001, 14:35:06 Dernière modification le : Vendredi 12 Janvier 2001, 14:35:06