Improved measurement of CP violation in neutral B decays to cc̄s

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doi:10.1103/PhysRevLett.99.171803

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) ×106Υ(4S)→BB̄ 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).

Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J., Poireau, V., et al. (2007). Improved measurement of CP violation in neutral B decays to cc̄s. PHYSICAL REVIEW LETTERS, 99(17) [10.1103/PhysRevLett.99.171803].