{
  "id": "hep-ex/0006040",
  "version": "v2",
  "published": "2000-06-30T18:08:38.000Z",
  "updated": "2000-07-05T08:47:09.000Z",
  "title": "Measurement of the K_L -> e+ e- e+ e- Decay Rate",
  "authors": [
    "A. Lai"
  ],
  "comment": "LaTeX, 10 pages, 4 Figures. Fig. 2 corrected (wrong cut shape before). Contributed paper # 229 to ICHEP 2000, Osaka",
  "journal": "Phys.Lett. B615 (2005) 31-38",
  "doi": "10.1016/j.physletb.2005.03.078",
  "categories": [
    "hep-ex"
  ],
  "abstract": "The decay rate of the neutral long-lived K meson into the e+ e- e+ e- final state has been measured with the NA48 detector at the CERN SPS. Using data collected in 1999, a total of 132 events has been observed with negligible background. The total number of kaons was determined to be 5.1 x 10^10. This observation corresponds to a preliminary branching ratio of Gamma(K_L -> e+ e- e+ e-)/Gamma(K_L -> all) = (3.67 +- 0.32(stat) +- 0.23(sys) +- 0.08(norm)) x 10^-8, where the first error is statistical, the second systematic, and the third error is due to the uncertainty in the normalization.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2000-07-05T08:47:09.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "decay rate",
      "measurement",
      "na48 detector",
      "total number",
      "final state"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "LaTeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 529527
    }
  }
}