{
  "id": "hep-ex/0208027",
  "version": "v1",
  "published": "2002-08-17T14:10:49.000Z",
  "updated": "2002-08-17T14:10:49.000Z",
  "title": "Observation of a 1750 MeV/c^2 Enhancement in the Diffractive Photoproduction of K^+K^-",
  "authors": [
    "FOCUS Collaboration"
  ],
  "comment": "10 pages, 5 figures",
  "journal": "Phys.Lett.B545:50-56,2002",
  "doi": "10.1016/S0370-2693(02)02561-3",
  "categories": [
    "hep-ex"
  ],
  "abstract": "Using the FOCUS spectrometer with photon beam energies between 20 and 160 \\gev, we confirm the existence of a diffractively photoproduced enhancement in $K^+K^-$ at 1750 \\mevcc with nearly 100 times the statistics of previous experiments. Assuming this enhancement to be a single resonance with a Breit-Wigner mass shape, we determine its mass to be $1753.5\\pm 1.5\\pm 2.3$ \\mevcc and its width to be $122.2\\pm 6.2\\pm 8.0$ \\mevcc. We find no corresponding enhancement at 1750 \\mevcc in $K^*K$, and again neglecting any possible interference effects we place limits on the ratio $\\Gamma (X(1750) \\to K^*K)/\\Gamma (X(1750) \\to K^+K^-)$. Our results are consistent with previous photoproduction experiments, but, because of the much greater statistics, challenge the common interpretation of this enhancement as the $\\phi (1680)$ seen in $e^+e^-$ annihilation experiments.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2002-08-17T14:10:49.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "enhancement",
      "diffractive photoproduction",
      "observation",
      "photon beam energies",
      "breit-wigner mass shape"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 593187,
      "adsabs": "2002hep.ex....8027F"
    }
  }
}