{
  "id": "0810.1657",
  "version": "v1",
  "published": "2008-10-09T14:04:38.000Z",
  "updated": "2008-10-09T14:04:38.000Z",
  "title": "Measurement of the form factors of the decay B^0 -> D^{*-} l^+ nu_l and determination of the CKM matrix element |V_{cb}|",
  "authors": [
    "The Belle Collaboration",
    "I. Adachi"
  ],
  "comment": "18 pages, 7 figures",
  "categories": [
    "hep-ex"
  ],
  "abstract": "This paper describes a determination of the Cabibbo-Kobayashi-Maskawa matrix element $|V_{cb}|$ using the decay $B^0\\to D^{*-}\\ell^+\\nu_\\ell$. We perform a combined measurement of this quantity and of the form factors $\\rho^2$, $R_1(1)$, and $R_2(1)$ which fully characterize this decay in the framework of heavy-quark effective theory, based on 140 fb$^{-1}$ of Belle data collected near the $\\Upsilon(4S)$ resonance. The results, based on about 69,000 reconstructed $B^0\\to D^{*-}\\ell^+\\nu_\\ell$ decays, are $\\rho^2=1.293\\pm 0.045\\pm 0.029$, $R_1(1)=1.495\\pm 0.050\\pm 0.062$, $R_2(1)=0.844\\pm 0.034\\pm 0.019$ and $\\mathcal{F}(1)|V_{cb}|=34.4\\pm 0.2\\pm 1.0$. The $B^0\\to D^{*-}\\ell^+\\nu_\\ell$ branching fraction is found to be $(4.42\\pm 0.03\\pm 0.25)%$. For all these numbers, the first error is the statistical and the second is the systematic uncertainty. All results are preliminary.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2008-10-09T14:04:38.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "ckm matrix element",
      "form factors",
      "measurement",
      "determination",
      "cabibbo-kobayashi-maskawa matrix element"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 18,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 798984,
      "adsabs": "2008arXiv0810.1657T"
    }
  }
}