Abstract
We present updated results on time-dependent CP-violating asymmetries in neutral B decays to several CP eigenstates containing charmonium. In the Standard Model, the amplitude of these asymmetries is proportional to sin2β. We measure sin2β = 0.741 ± 0.067 (stat) ± 0.034 (syst) from a data sample of about 88 million γ(4 S) → B B decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We have also measured CP-violating asymmetries in open charm, and penguin modes sensitive to sin2β, which provide important consistency tests of the Standard Model.
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