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

B. Aubert et al. (BABAR Collaboration)
Phys. Rev. Lett. 99, 021603 – Published 12 July 2007

Abstract

We report observations of CP violation in the decays B0K+π and B0π+π in a sample of 383×106 Υ(4S)BB¯ 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 1C.L.=8×108, corresponding to 5.4 standard deviations.

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  • Received 8 March 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.021603

©2007 American Physical Society

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Vol. 99, Iss. 2 — 13 July 2007

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