{
  "id": "hep-ex/0207060",
  "version": "v1",
  "published": "2002-07-24T17:28:02.000Z",
  "updated": "2002-07-24T17:28:02.000Z",
  "title": "First Observation of Upsilon(1D) States",
  "authors": [
    "S. E. Csorna",
    "CLEO Collaboration"
  ],
  "comment": "14 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS, ICHEP02",
  "categories": [
    "hep-ex"
  ],
  "abstract": "The CLEO III experiment has recently accumulated a large statistics sample of 4.73 x 10^6 Upsilon(3S) decays. We present the first evidence for the production of the triplet Upsilon(1D) states in the four-photon cascade, Upslion(3S) -> gamma chi_b(2P), chi_b(2P) -> gamma Upsilon(1D), Upsilon(1D) -> gamma chi_b(1P), chi_b(1P) -> gamma Upsilon(1S), followed by the Upsilon(1S) annihilation to e+ e- or mu+ mu-. The signal has a significance of 9.7 standard deviations. The measured product branching ratio for these five decays, (3.3 +- 0.6 +- 0.5) x 10^{-5}, is consistent with the theoretical estimates. We see a 6.8 standard deviation signal for a state with a mass of 10162.2 +- 1.6 MeV/c^2, consistent with the Upsilon(1D_2) assignment. We also present improved measurements of the Upsilon(3S) -> pi0 pi0 Upsilon(1S) branching ratio and the associated di-pion mass distribution.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2002-07-24T17:28:02.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "first observation",
      "gamma upsilon",
      "large statistics sample",
      "associated di-pion mass distribution",
      "standard deviation signal"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 591230,
      "adsabs": "2002hep.ex....7060C"
    }
  }
}