Observation Of Cp Violation In The B-0 Meson System
B. Aubert,D. Boutigny,J.-M. Gaillard,A. Hicheur,Y. Karyotakis,J. P. Lees,P. Robbe,V. Tisserand,A. Palano,G. P. Chen,J. C. Chen,N. D. Qi,G. Rong,P. Wang,Y. S. Zhu,G. Eigen,P. L. Reinertsen,B. Stugu,B. Abbott,G. S. Abrams,A. W. Borgland,A. B. Breon,D. N. Brown,J. Button-Shafer,R. N. Cahn,A. R. Clark,M. S. Gill,A. V. Gritsan,Y. Groysman,R. G. Jacobsen,R. W. Kadel,J. Kadyk,L. T. Kerth,S. Kluth,G. Kolomensky,J. F. Kral,C. LeClerc,M. E. Levi,T. Liu,G. Lynch,A. B. Meyer,M. Momayezi,P. J. Oddone,A. Perazzo,M. Pripstein,N. A. Roe,A. Romosan,M. T. Ronan,V. G. Shelkov,A. V. Telnov,W. A. Wenzel,M. S. Zisman,P. G. Bright-Thomas,T. J. Harrison,C. M. Hawkes,D. J. Knowles,S. W. O'Neale,R. C. Penny,A. T. Watson,N. K. Watson,T. Deppermann,K. Goetzen,H. Koch,J. Krug,M. Kunze,B. Lewandowski,K. Peters,H. Schmuecker,M. Steinke,J. C. Andress,N. R. Barlow,W. Bhimji,N. Chevalier,P. J. Clark,W. N. Cottingham,N. De Groot,N. Dyce,B. Foster,J. D. McFall,D. Wallom,F. F. Wilson,K. Abe,C. Hearty,T. S. Mattison,J. A. 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PHYSICAL REVIEW LETTERS（2001）
引用 291|浏览394
摘要
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 Y(4S) decays collected in 2001, bringing the data available to 32 x 10(6) B (B) over bar pairs. 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 sin2 beta, is derived from the decay time distributions in such events. The result sin2 beta = 0.59 +/-0.14(stat) +/-0.05(syst) establishes CP violation in the B-0 meson system. We also determine \ gimel \ = 0.93 +/-0.09(stat) +/-0.03(syst), consistent with no direct CP violation.
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关键词
standard model,elementary particles,cp violation
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