{
  "id": "hep-ph/9401226",
  "version": "v1",
  "published": "1994-01-10T11:49:05.000Z",
  "updated": "1994-01-10T11:49:05.000Z",
  "title": "Heavy Quark Expansion for the Inclusive Decay $\\bar B\\toτ\\,\\barν\\,X$",
  "authors": [
    "Adam F. Falk",
    "Zoltan Ligeti",
    "Matthias Neubert",
    "Yosef Nir"
  ],
  "comment": "16pages harvmac",
  "journal": "Phys.Lett.B326:145-153,1994",
  "doi": "10.1016/0370-2693(94)91206-8",
  "categories": [
    "hep-ph"
  ],
  "abstract": "We calculate the differential decay rate for inclusive $\\bar B\\to\\tau\\,\\bar\\nu\\,X$ transitions to order $1/m_b^2$ in the heavy quark expansion, for both polarized and unpolarized tau leptons. We show that using a systematic $1/m_b$ expansion significantly reduces the theoretical uncertainties in the calculation. We obtain for the total branching ratio ${\\rm BR}(\\bar B\\to\\tau\\,\\bar\\nu\\,X)=2.30\\pm 0.25\\%$, and for the tau polarization $A_{\\rm pol}=-0.706\\pm0.006$. {}From the experimental measurement of the branching ratio at LEP, we derive the upper bound $\\lo\\leq 0.8\\gev^2$ for one of the parameters of the heavy quark effective theory.",
  "revisions": [
    {
      "version": "v1",
      "updated": "1994-01-10T11:49:05.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "heavy quark expansion",
      "inclusive decay",
      "differential decay rate",
      "heavy quark effective theory",
      "expansion significantly reduces"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 16,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 36983
    }
  }
}