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

BABAR Collaboration (582 authors), and Britton, D. (2000) A study of time-dependent CP-violating asymmetries in B0 -> J/psi K0S and B0 -> psi(2S) K0S decays. In: 30th International Conference on High-Energy Physics (ICHEP 2000) Proceedings, Osaka, Japan, 27 Jul-2 Aug 2000,

Abstract

We 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).

• Item Type: Conference Proceedings
• Additional Information: ICHEP 2000: Proceedings. Edited by C.S. Lim and Taku Yamanaka. Singapore, World Scientific, 2001. 2v.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Britton, Professor David
• Authors: BABAR Collaboration (582 authors), , and Britton, D.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: 30th International Conference on High-Energy Physics

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