@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 Ronan, {M. T.} and Shelkov, {V. G.} and J. Olsen",
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",
}