Aubert, B. et al. (2007) Improved Measurement of CP Violation in Neutral B Decays to cc[over ¯]s. Physical Review Letters, 99 (17). p. 171803. ISSN 0031-9007

We present updated measurements of time-dependent CP asymmetries in fully-reconstructed neutral B decays to several CP eigenstates containing a charmonium meson. The measurements use a data sample of (383±4)×106 Υ(4S)→BB̅ decays collected with the BABAR detector at the PEP-II B factory. We determine sin⁡2β=0.714±0.032(stat)±0.018(syst) and |λ|=0.952±0.022(stat)±0.017(syst).

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