First Measurement of the CP-Violating Asymmetries with BABAR

Details First Measurement of the CP-Violating Asymmetries with BABAR First Measurement of the CP-Violating Asymmetries with BABAR

2001-01-29

arxiv.org/abs/hep-ex/0101054v1

Int.J.Mod.Phys.A16S1B:611-615,2001

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, submitted to DPF2000

Scientific paper

10.1142/S0217751X01007601

We report on 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 B Factory at SLAC. The data sample consisted of 9.0 fb-1 collected at the Y(4S) resonance and 0.8 fb-1 off-resonance. One of the pair of neutral B mesons produced at the Y(4S) was fully reconstructed, while the flavor of the other neutral B meson was tagged at the time of its decay. The value of the asymmetry amplitude, sin(2beta), was determined from a maximum likelihood fit to the time distribution of 120 tagged candidates to be sin(2beta) = 0.12 +- 0.37 (stat.) +- 0.09 (syst.) (preliminary).

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