{
  "id": "hep-ex/0403008",
  "version": "v4",
  "published": "2004-03-04T11:34:37.000Z",
  "updated": "2004-04-26T01:07:37.000Z",
  "title": "A Study of J/psi-->gamma gamma V(rho,phi) Decays with the BESII Detector",
  "authors": [
    "BES Collaboration"
  ],
  "comment": "10 pages, 5 figures, submitted to PLB",
  "journal": "Phys.Lett.B594:47-53,2004",
  "doi": "10.1016/j.physletb.2004.04.085",
  "categories": [
    "hep-ex"
  ],
  "abstract": "Using a sample of $58\\times 10^6$ $J/\\psi$ events collected with the BESII detector, radiative decays $J/\\psi\\to\\gamma\\gamma V$, where $V=\\rho$ or $\\phi$, are studied. A resonance around 1420 MeV/c$^2$ (X(1424)) is observed in the $\\gamma\\rho$ mass spectrum. Its mass and width are measured to be $1424\\pm 10(stat)\\pm 11(sys)$ MeV/c$^2$ and $ 101.0\\pm 8.8 \\pm 8.8$ MeV/c$^2$, respectively, and its branching ratio $B(J/\\psi\\to \\gamma X(1424)\\to \\gamma \\gamma \\rho)$ is determined to be $(1.07\\pm0.17 \\pm 0.11)\\times 10^{-4}$. A search for $X(1424)\\to \\gamma\\phi$ yields a 95% C.L. upper limit $B(J/\\psi\\to \\gamma X(1424)\\to \\gamma\\gamma \\phi) < 0.82 \\times 10^{-4}$.",
  "revisions": [
    {
      "version": "v4",
      "updated": "2004-04-26T01:07:37.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "13.25.Gv",
      "14.40.Gx",
      "13.40.Hq"
    ],
    "keywords": [
      "besii detector",
      "mass spectrum",
      "upper limit",
      "radiative decays",
      "branching ratio"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 645697
    }
  }
}