{
  "id": "0912.1434",
  "version": "v1",
  "published": "2009-12-08T08:55:18.000Z",
  "updated": "2009-12-08T08:55:18.000Z",
  "title": "Observation of the decay $B_s^0\\to J/ψη$ and Evidence for $B_s^0\\to J/ψη'$",
  "authors": [
    "The Belle Collaboration"
  ],
  "comment": "6 pages, 3 figures, 2 tables. Contributed to Moriond QCD 09, FPCP 09, EPS HEP 09, DPF 09, and BEAUTY 09",
  "categories": [
    "hep-ex"
  ],
  "abstract": "We report the first observation of $B_s^0\\to J/\\psi\\eta$ and evidence for $B_s^0\\to J/\\psi\\eta'$. These results are obtained from $23.6 \\mathrm{fb}^{-1}$ of data collected at the $\\Upsilon(5S)$ resonance with the Belle detector at the KEKB $e^+e^-$ collider. We measure the branching fractions $\\mathcal{B}(B_s^0\\to J/\\psi\\eta)= (3.32 \\pm 0.87(\\mathrm{stat.})^{+0.32}_{-0.28}(\\mathrm{syst.}) \\pm 0.42(f_s))\\times 10^{-4}}$ with a significance of $7.3 \\sigma$, and $\\mathcal{B}(B_s^0\\to J/\\psi\\eta')= (3.1 \\pm 1.2(\\mathrm{stat.})^{+0.5}_{-0.6}(\\mathrm{syst.}) \\pm 0.38(f_s))\\times 10^{-4}$ with a significance of $3.8 \\sigma$.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2009-12-08T08:55:18.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "13.25.Hw",
      "14.40.Nd"
    ],
    "keywords": [
      "belle detector",
      "significance",
      "first observation",
      "branching fractions"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 839221,
      "adsabs": "2009arXiv0912.1434T"
    }
  }
}