{
  "id": "hep-ex/9907006",
  "version": "v1",
  "published": "1999-07-07T23:01:28.000Z",
  "updated": "1999-07-07T23:01:28.000Z",
  "title": "Study of the $φ$ decays into $π^0π^0γ$ and $ηπ^0γ$ final states",
  "authors": [
    "CMD-2 Collaboration"
  ],
  "comment": "13 pages, 6 figures, Submitted to Phys. Lett. B",
  "journal": "Phys.Lett.B462:380,1999",
  "doi": "10.1016/S0370-2693(99)00920-X",
  "categories": [
    "hep-ex"
  ],
  "abstract": "Radiative decays of the $\\phi$ meson have been studied using a data sample of about 19 million $\\phi$ decays collected by the CMD-2 detector at VEPP-2M collider in Novosibirsk. From selected $e^+e^-\\to\\pi^{0}\\pi^{0}\\gamma$ and $e^+e^-\\to\\eta\\pi^{0}\\gamma$ events the following model independent results have been obtained: \\par $Br(\\phi\\to\\pi^{0}\\pi^{0}\\gamma) = (0.92\\pm 0.08\\pm0.06)\\times10^{-4}$ for $M_{\\pi^{0}\\pi^{0}}>700$ MeV, \\par $Br(\\phi\\to\\eta\\pi^{0}\\gamma) = (0.90\\pm 0.24\\pm 0.10)\\times10^{-4}$. It is shown that the intermediate mechanism $f_{0}(980)\\gamma$ dominates in the $\\phi\\to\\pi^{0}\\pi^{0}\\gamma$ decay and the corresponding branching ratio is \\par $Br(\\phi\\to f_{0}(980)\\gamma)=(2.90\\pm 0.21\\pm1.54)\\times10^{-4}$. The systematic error is dominated by the possible model uncertainty. \\par Using the same data sample the upper limit has been obtained for the P- and CP-violating decay of $\\eta$ at 90% CL: \\par $Br(\\eta\\to\\pi^{0}\\pi^{0}) < 4.3\\times10^{-4}$ >.",
  "revisions": [
    {
      "version": "v1",
      "updated": "1999-07-07T23:01:28.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "final states",
      "data sample",
      "model independent results",
      "systematic error",
      "upper limit"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 13,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 503232
    }
  }
}