Observation of CP Violation in B[superscript 0]→K[superscript +]π[superscript -] and B[superscript 0]→π[superscript +]π[superscript -]
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Author(s)
Sciolla, Gabriella
Sekula, S. J.
Yamamoto, R. K.
Cowan, Ray F
Fisher, Peter H
Spitznagel, Michael A
Taylor, Frank E
Date Issued
July 2007
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
B. Aubert et al. BABAR Collaboration. "Observation of CP Violation of CP Violation in B[superscript 0]→K[superscript +]π[superscript -] and B[superscript 0]→π[superscript +]π[superscript -]" Physical Review Letters 99, 021603 (2007). © 2007 The American Physical Society
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Final published version
Abstract
We report observations of CP violation in the decays B[superscript 0]→K[superscript +]π[superscript -] and B[superscript 0]→π[superscript +]π[superscript -] in a sample of 383×10[superscript 6] Υ(4S)→BB̅ events. We find 4372±82 B[superscript 0]→K[superscript +]π[superscript -] decays and measure the direct CP-violating charge asymmetry A[subscript Kπ]=-0.107±0.018(stat)[subscript -0.004][[superscript +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 B[superscript 0]→π[superscript +]π[superscript -] decays and measure the CP-violating asymmetries S[subscript ππ]=-0.60±0.11(stat)±0.03(syst) and C[subscript ππ]=-0.21±0.09(stat)±0.02(syst). CP conservation in B[superscript 0]→π[superscript +]π[superscript -] (S[subscript ππ]=C[subscript ππ]=0) is excluded at a confidence level 1-C.L.=8×10[superscript -8], corresponding to 5.4 standard deviations.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.99.021603
