{
  "id": "hep-ex/9909003",
  "version": "v2",
  "published": "1999-09-02T23:20:41.000Z",
  "updated": "1999-11-15T23:40:38.000Z",
  "title": "A Measurement of $\\sin 2β$ from $B\\to J/ψK^0_S$ with the CDF detector",
  "authors": [
    "CDF Collaboration"
  ],
  "comment": "36 pages, 9 figures, submitted to Phys.Rev.D, modifications to text for publication",
  "journal": "Phys.Rev.D61:072005,2000",
  "doi": "10.1103/PhysRevD.61.072005",
  "categories": [
    "hep-ex"
  ],
  "abstract": "This paper reports an updated measurement of the Standard Model CP violation parameter $\\sin2\\beta$ using the CDF Detector at Fermilab. The entire Run I data sample of 110 pb$^{-1}$ of proton antiproton collisions at $\\sqrt{s}=1.8 TeV$ is used to identify a signal sample of $\\sim 400$ $B \\to J/\\psi K^0_S$ events, where $J/\\psi \\to \\mu^+\\mu^-$ and $K_S^0 \\to \\pi^+\\pi^-$. The flavor of the neutral B meson is identified at the time of production by combining information from three tagging algorithms: a same-side tag, a jet-charge tag, and a soft-lepton tag. A maximum likelihood fitting method is used to determine $\\sin2\\beta = 0.79 {+0.41\\atop-0.44}$(stat+syst). This value of $\\sin 2 \\beta$ is consistent with the Standard Model prediction, based upon existing measurements, of a large positive CP violating asymmetry in this decay mode.",
  "revisions": [
    {
      "version": "v2",
      "updated": "1999-11-15T23:40:38.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "cdf detector",
      "measurement",
      "standard model cp violation parameter",
      "large positive cp violating asymmetry",
      "standard model prediction"
    ],
    "tags": [
      "journal article",
      "famous paper"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. D"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 36,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 506520
    }
  }
}