{
  "id": "hep-ex/0402023",
  "version": "v2",
  "published": "2004-02-13T02:50:58.000Z",
  "updated": "2004-10-01T12:54:22.000Z",
  "title": "Evidence for $B^+\\toωl^+ ν$",
  "authors": [
    "The Belle Collaboration"
  ],
  "comment": "9 pages, 1 figure",
  "journal": "Phys.Rev.Lett.93:131803,2004",
  "doi": "10.1103/PhysRevLett.93.131803",
  "categories": [
    "hep-ex"
  ],
  "abstract": "We have searched for the decay $B^+\\to\\omega l^+\\nu$ ($l=e$ or $\\mu$) in 78 fb$^{-1}$ of $\\Upsilon(4S)$ data (85 million $B\\bar B$ events) accumulated with the Belle detector. The final state is fully reconstructed using the $\\omega$ decay into $\\pi^+\\pi^-\\pi^0$, combined with detector hermeticity to estimate the neutrino momentum. A signal of $414\\pm 125$ events is found in the data, corresponding to a branching fraction of $(1.3\\pm 0.4\\pm 0.2\\pm 0.3)\\times 10^{-4}$, where the first two errors are statistical and systematic, respectively. The third error reflects the estimated form-factor uncertainty.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2004-10-01T12:54:22.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "13.20.He",
      "12.15.Hh"
    ],
    "keywords": [
      "third error reflects",
      "belle detector",
      "final state",
      "detector hermeticity",
      "estimated form-factor uncertainty"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. Lett."
    },
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 644450
    }
  }
}