Observation of CP violation in B-0 -> K+pi(-) and B-0 ->pi(+)pi(-)

B. Aubert, L.L. Zhang, S. Chen, W. Wang, J.M. Anderson, X.H. Li, M.A. Baak, G. Raven, H. Snoek, P. David, H. Schroder, H. Liu, N. van Bakel, A. Wagner, Z. Yu

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We report observations of CP violation in the decays B0→K+π- and B0→π+π- in a sample of 383×106 Υ(4S)→BB̄ events. We find 4372±82 B0→K+π- decays and measure the direct CP-violating charge asymmetry AKπ=-0.107±0.018(stat)-0.004+0.007(syst) , which excludes the CP-conserving hypothesis with a significance of 5.5 standard deviations. In the same sample, we find 1139±49 B0→π+π- decays and measure the CP-violating asymmetries Sππ=-0.60±0.11(stat)±0.03(syst) and Cππ=-0. 21±0.09(stat)±0.02(syst). CP conservation in B0→π+π- (Sππ=Cππ=0) is excluded at a confidence level 1-C.L.=8×10-8, corresponding to 5.4 standard deviations. © 2007 The American Physical Society.
Original languageEnglish
JournalPhysical Review Letters
Issue number2
Publication statusPublished - 2007

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Observation of CP violation in B-0 -> K+pi(-) and B-0 ->pi(+)pi(-)


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