2000/11/07 by D. G. Hitlin, David G. Hitlin, Hitlin, David G.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Neutrino Physics Research #Particle Detector Development and Performance #Particle physics theoretical and experimental studies #hep-ex
paper · pdf · doi:10.48550/arxiv.hep-ex/0011024
19 pages, 10 postscript figures, contributed to the Proceedings of ICHEP2000
arxiv created 2000/11/07 · openalex publication_date 2000/11/07 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present a preliminary measurement of time-dependent CP-violating asymmetries in B0-->J/psi KS and B0-->psi(2S) KS decays recorded by the BABAR detector at the PEP-II asymmetric B Factory at SLAC. The data sample consists of 9.0 fb-1 collected at the Upsilon(4S) resonance and 0.8 fb-1 off-resonance. One of the neutral B mesons, produced in pairs at the Upsilon(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. 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, sin(2*beta), is determined from a maximum likelihood fit to the time distribution of 120 tagged B0-->J/psi KS and B0-->psi(2S) KS candidates: sin(2*beta) = 0.12+/-0.37(stat)+/-0.09(syst).