{
  "id": "hep-ex/0703016",
  "version": "v2",
  "published": "2007-03-08T21:30:09.000Z",
  "updated": "2007-08-02T00:59:24.000Z",
  "title": "Observation of CP Violation in B0 -> K+pi- and B0 -> pi+pi-",
  "authors": [
    "B. Aubert",
    "for the BABAR Collaboration"
  ],
  "comment": "7 pages, 3 postscript figures, as published in Phys. Rev. Lett. (minor text changes)",
  "journal": "Phys.Rev.Lett.99:021603,2007",
  "doi": "10.1103/PhysRevLett.99.021603",
  "categories": [
    "hep-ex"
  ],
  "abstract": "We report observations of CP violation in the decays B0 -> K+pi- and B0 -> pi+pi- in a sample of 383 million Y(4S) -> BBbar events. We find 4372 +/- 82 B0 -> K+pi- decays and measure the direct CP-violating charge asymmetry Akpi = -0.107 +/- 0.018 (stat) +0.007-0.004 (syst), which excludes the CP-conserving hypothesis with a significance of 5.5 standard deviations. In the same sample we find 1139 +/- 49 B0 -> pi+pi- decays and measure the CP-violating asymmetries Spipi = -0.60 +/- 0.11 (stat) +/- 0.03 (syst) and Cpipi = -0.21 +/- 0.09 (stat) +/- 0.02 (syst). CP conservation in B0 -> pi+pi- (Spipi=Cpipi=0) is excluded at a confidence level 1-C.L. = 8 * 10^{-8}, corresponding to 5.4 standard deviations.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2007-08-02T00:59:24.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "11.30.Er",
      "12.15.Hh",
      "13.25.Hw"
    ],
    "keywords": [
      "cp violation",
      "direct cp-violating charge asymmetry akpi",
      "standard deviations",
      "report observations",
      "decays b0"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. Lett."
    },
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 746134
    }
  }
}