@article{510a96cc0fd74c1381f3edd24d6a5912,
title = "Observation of CP violation in the B0 meson system",
abstract = "We present an updated measurement of time-dependent CP-violating asymmetries in neutral B decays with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. This result uses an additional sample of γ(4S)decays collected in 2001, bringing the data available to 32 ×106 BB¯ We select events in which one neutral B meson is fully reconstructed in a final state containing charmonium and the flavor of the other neutral B meson is determined from its decay products. The amplitude of the CP-violating asymmetry, which in the standard model is proportional to sin2β, is derived from the decay time distributions in such events. The result sin2β=0.59 ± 0.14(stat)±0.05(syst) establishes CP violation in the B0 meson system. We also determine |λ|= 0.93±0.09(stat)±0.03(syst), consistent with no direct CP violation.",
author = "\{BABAR Collaboration\} and B. Aubert and D. Boutigny and Gaillard, \{J. M.\} and A. Hicheur and Y. Karyotakis and Lees, \{J. P.\} and P. Robbe and V. Tisserand and A. Palano and Chen, \{G. P.\} and Chen, \{J. C.\} and Qi, \{N. D.\} and G. Rong and P. Wang and Zhu, \{Y. S.\} and G. Eigen and Reinertsen, \{P. L.\} and B. Stugu and B. Abbott and Abrams, \{G. S.\} and Borgland, \{A. W.\} and Breon, \{A. B.\} and Brown, \{D. N.\} and J. Button-Shafer and Cahn, \{R. N.\} and Clark, \{A. R.\} and Gill, \{M. S.\} and Gritsan, \{A. V.\} and Y. Groysman and Jacobsen, \{R. G.\} and Kadel, \{R. W.\} and J. Kadyk and Kerth, \{L. T.\} and S. Kluth and Kolomensky, \{Yu G.\} and Kral, \{J. F.\} and C. LeClerc and Levi, \{M. E.\} and T. Liu and G. Lynch and Meyer, \{A. B.\} and M. Momayezi and Oddone, \{P. J.\} and A. Perazzo and M. Pripstein and Roe, \{N. A.\} and A. Romosan and Lange, \{D. J.\} and J. Olsen and P. Elmer",
year = "2001",
month = aug,
day = "14",
doi = "10.1103/PhysRevLett.87.091801",
language = "English (US)",
volume = "87",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "9",
}