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Phys. Rev. Lett. 99, 021603 (2007) [7 pages]

Observation of CP Violation in B0K+π- and B0π+π-

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B. Aubert et al. BABAR Collaboration
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Received 8 March 2007; published 12 July 2007

We report observations of CP violation in the decays B0K+π- and B0π+π- in a sample of 383×106 Υ(4S)→BB̅ events. We find 4372±82 B0K+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 B0π+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 B0π+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

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.021603
DOI:
10.1103/PhysRevLett.99.021603
PACS:
11.30.Er, 13.25.Hw, 12.15.Hh