{
  "id": "hep-ex/0505073",
  "version": "v2",
  "published": "2005-05-24T12:43:05.000Z",
  "updated": "2005-05-24T20:10:35.000Z",
  "title": "Observation of h_c(^1P_1) State of Charmonium",
  "authors": [
    "J. L. Rosner",
    "CLEO Collaboration"
  ],
  "comment": "9 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2005/, submitted to PRL",
  "journal": "Phys.Rev.Lett.95:102003,2005",
  "doi": "10.1103/PhysRevLett.95.102003",
  "categories": [
    "hep-ex"
  ],
  "abstract": "The h_c(1P1) state of charmonium has been observed in the reaction \\psi(2S) -> \\pi0 h_c -> (\\gamma\\gamma)(\\gamma\\eta_c) using 3.08 million \\psi(2S) decays recorded in the CLEO detector. Data have been analyzed both for the inclusive reaction, where the decay products of the \\eta_c are not identified, and for exclusive reactions, in which \\eta_c decays are reconstructed in seven hadronic decay channels. We find M(h_c)=3524.4 +/- 0.6 +/- 0.4 MeV which corresponds to a hyperfine splitting \\Delta M_{hf}(1P) \\equiv <M(3PJ)>-M(1P1)=+1.0+/-0.6+/-0.4 MeV, and B(\\psi(2S)->\\pi0 h_c)xB(h_c->\\gamma\\eta_c)=(4. +/-0.8+/-0.7)x10^{-4}.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2005-05-24T20:10:35.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "14.40.Gx",
      "12.38.Qk",
      "13.66.Bc",
      "13.25.Gv"
    ],
    "keywords": [
      "charmonium",
      "observation",
      "seven hadronic decay channels",
      "decay products",
      "cleo detector"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. Lett."
    },
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 683281
    }
  }
}