A study of time-dependent CP-violating asymmetries in B0 -> J/psi K0S and B0 -> psi(2S) K0S decays

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dc.creatorThe BABAR Collaboration
dc.creatorAubert, B.
dc.date2000-08-23
dc.date.accessioned2026-07-07T03:34:04Z
dc.date.available2026-07-07T03:34:04Z
dc.descriptionWe present a preliminary measurement of time-dependent CP-violating asymmetries in B0 -> J/psi K0S and B0 -> psi(2S) K0S decays recorded by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. The data sample consists of 9.0 fb-1 collected at the Y(4S) resonance and 0.8 fb-1 off-resonance. One of the neutral B mesons, produced in pairs at the Y(4S), is fully reconstructed. The flavor of the other neutral B meson is tagged at the time of its decay, mainly with the charge of identified leptons and kaons. A neural network tagging algorithm is used to recover events without a clear lepton or kaon tag. The time difference between the decays is determined by measuring the distance between the decay vertices. Wrong-tag probabilities and the time resolution function are measured with samples of fully-reconstructed semileptonic and hadronic neutral B final states. The value of the asymmetry amplitude, sin2beta, is determined from a maximum likelihood fit to the time distribution of 120 tagged B0 -> J/psi K0S and B0 -> psi(2S) K0S candidates to be sin2beta = 0.12+/-0.37 (stat) +/- 0.09 (syst) (preliminary).
dc.description31 pages, 11 postscript figues, contributed paper to ICHEP2000
dc.identifierhttps://arxiv.org/abs/hep-ex/0008048
dc.identifierhttp://arxiv.org/abs/hep-ex/0008048
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/36830
dc.subjectHigh Energy Physics - Experiment
dc.titleA study of time-dependent CP-violating asymmetries in B0 -> J/psi K0S and B0 -> psi(2S) K0S decays
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