{
  "id": "hep-ex/0209013",
  "version": "v1",
  "published": "2002-09-07T12:38:17.000Z",
  "updated": "2002-09-07T12:38:17.000Z",
  "title": "A Measurement of the B0 -> J/psi pi+pi- Branching Fraction",
  "authors": [
    "B. Aubert"
  ],
  "comment": "7 pages, 2 postscript figues",
  "journal": "Phys.Rev.Lett.90:091801,2003",
  "doi": "10.1103/PhysRevLett.90.091801",
  "categories": [
    "hep-ex"
  ],
  "abstract": "We present a measurement of the branching fraction for the decay of the neutral $B$ meson into the final state $J/\\psi\\pi^+\\pi^-$. The data set contains approximately 56 million $B\\bar{B}$ pairs produced at the $\\Upsilon(4S)$ resonance and recorded with the BaBar detector at the PEP-II asymmetric-energy $e^+e^-$ storage ring. The result of this analysis is $\\mathcal{B}$($B^0\\to J/\\psi\\pi^+\\pi^-$) = (4.6 $\\pm$ 0.7 $\\pm$ 0.6)$\\times 10^{-5}$, where the first error is statistical and the second is systematic. In addition we measure $\\mathcal{B}(B^0\\to J/\\psi\\rho^0) = (1.6 \\pm 0.6 \\pm 0.4 )\\times 10^{-5}$.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2002-09-07T12:38:17.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "branching fraction",
      "measurement",
      "data set contains",
      "final state",
      "babar detector"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. Lett."
    },
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 594586
    }
  }
}