{
  "id": "hep-ex/0408022",
  "version": "v1",
  "published": "2004-08-10T00:55:21.000Z",
  "updated": "2004-08-10T00:55:21.000Z",
  "title": "Measurement of the Branching Fraction of e^+e^- --> B0B0bar at the Upsilon(4S) Resonance",
  "authors": [
    "The BABAR Collaboration",
    "B. Aubert"
  ],
  "comment": "Latex, 18 pages, 7 figures, submitted to ICHEP 2004, Beijing, China",
  "categories": [
    "hep-ex"
  ],
  "abstract": "We report a measurement of the branching fraction e^+e^- --> B0B0bar with a data sample of 81.7 fb^-1 collected at the Upsilon(4S) resonance with the BABAR detector at the PEP-II asymmetric-energy e^+e^- storage ring. Using partial reconstruction of the decay B0bar --> D^{*+} \\ell^{-} \\bar{\\nu}_{\\ell} we obtain a preliminary result of f00 = 0.486 +- 0.010(stat.) +- 0.009(sys.). Our result does not depend on branching fractions of the B0bar and the D^{*+} decay chains, on the simulated reconstruction efficiency, on the ratio of the charged and neutral B meson lifetimes, nor on assumption of isospin symmetry. This measurement is important for normalizing many B decay branching fractions, and contributes to our understanding of isospin violation in the Upsilon(4S) system.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2004-08-10T00:55:21.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "measurement",
      "decay branching fractions",
      "data sample",
      "isospin symmetry",
      "babar detector"
    ],
    "note": {
      "typesetting": "LaTeX",
      "pages": 18,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 656196,
      "adsabs": "2004hep.ex....8022T"
    }
  }
}