{
  "id": "hep-ex/0404021",
  "version": "v1",
  "published": "2004-04-16T12:26:32.000Z",
  "updated": "2004-04-16T12:26:32.000Z",
  "title": "First Observation of a Upsilon(1D) State",
  "authors": [
    "G. Bonvicini",
    "CLEO Collaboration"
  ],
  "comment": "12 pages postscript,also available through this http://w4.lns.cornell.edu/public/CLNS/, submitted to PRD",
  "journal": "Phys.Rev.D70:032001,2004",
  "doi": "10.1103/PhysRevD.70.032001",
  "categories": [
    "hep-ex"
  ],
  "abstract": "We present the first evidence for the production of Upsilon(1D) states in the four-photon cascade, Upsilon(3S)-->gamma chib(2P), chib(2P)-->gamma Upsilon(1D), Upsilon(1D)-->gamma chib(1P), chib(1P)-->gamma Upsilon(1S), followed by the Upsilon(1S) annihilation into e+e- or mu+mu-. The signal has a significance of 10.2 standard deviations. The measured product branching ratio for these five decays, (2.5+-0.5+-0.5)x10^(-5), is consistent with the theoretical estimates. The data are dominated by the production of one Upsilon(1D) state consistent with the J=2 assignment. Its mass is determined to be (10161.1+-0.6+-1.6) MeV, which is consistent with the predictions from potential models and lattice QCD calculations. We also searched for Upsilon(3S)-->gammachib(2P), chib(2P)-->gammaUpsilon(1D), followed by either Upsilon(1D)-->eta Upsilon(1S) or Upsilon(1D)-->pi+pi- Upsilon(1S). We find no evidence for such decays and set upper limits on the product branching ratios.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2004-04-16T12:26:32.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "14.40.Gx",
      "13.20.Gd"
    ],
    "keywords": [
      "first observation",
      "set upper limits",
      "lattice qcd calculations",
      "production",
      "measured product branching ratio"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. D"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 12,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 648444
    }
  }
}