{
  "id": "hep-ex/0610019",
  "version": "v3",
  "published": "2006-10-08T09:45:37.000Z",
  "updated": "2006-11-30T00:33:43.000Z",
  "title": "Direct Measurements of the Branching Fractions for the Semileptonic Decays $D^0 \\to K^-μ^+ν_μ$ and $D^0 \\to π^-μ^+ν_μ$",
  "authors": [
    "BES Collaboration",
    "M. Ablikim"
  ],
  "comment": "7 pages, 6 figures",
  "categories": [
    "hep-ex"
  ],
  "abstract": "Based on the data sample of 33 pb$^{-1}$ collected at and around 3.773 GeV with the BES-II detector at the BEPC collider, the absolute branching fractions for the semileptonic decays $D^0\\to K^-\\mu^+\\nu_\\mu$ and $D^0\\to\\pi^-\\mu^+\\nu_\\mu$ have been measured. In the system recoiling against $7584\\pm198\\pm341$ singly tagged $\\bar D^0$ mesons, $87.2\\pm13.6$ events for $D^0\\to K^-\\mu^+\\nu_\\mu$ and $9.3\\pm7.4$ events for $D^0\\to\\pi^-\\mu^+\\nu_\\mu$ are observed. These yield the absolute branching fractions to be $BF(D^0\\to K^-\\mu ^+\\nu_\\mu)= (3.55\\pm0.56\\pm0.59)%$ and $BF(D^0\\to\\pi^-\\mu^+\\nu_\\mu)= (0.38\\pm0.30\\pm0.10)%$. The measured branching fraction for $D^0\\to K^-\\mu ^+\\nu_\\mu$ was previously used to determine the ratio $\\Gamma(D^0\\to K^-\\mu^+\\nu_\\mu)/ \\Gamma(D^+\\to \\bar K^0\\mu^+\\nu_\\mu)$ combining the previously measured branching fraction for $D^+\\to \\bar K^0\\mu^+\\nu_\\mu$ by the BES Collaboration.",
  "revisions": [
    {
      "version": "v3",
      "updated": "2006-11-30T00:33:43.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "13.25.Gv",
      "14.40.Gx",
      "12.38.Qk"
    ],
    "keywords": [
      "semileptonic decays",
      "direct measurements",
      "absolute branching fractions",
      "measured branching fraction",
      "bepc collider"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 728300,
      "adsabs": "2006hep.ex...10019B"
    }
  }
}