{
  "id": "0705.4008",
  "version": "v2",
  "published": "2007-05-28T07:28:51.000Z",
  "updated": "2008-02-23T16:06:12.000Z",
  "title": "Determination of the Form Factors for the Decay B0 -> D*- l+ nu_l and of the CKM Matrix Element |V_cb|",
  "authors": [
    "The BABAR Collaboration",
    "B. Aubert"
  ],
  "comment": "18 pages, 7 postscript figures",
  "journal": "Phys.Rev.D77:032002,2008",
  "doi": "10.1103/PhysRevD.77.032002",
  "categories": [
    "hep-ex"
  ],
  "abstract": "We present a combined measurement of the Cabibbo-Kobayashi-Maskawa matrix element |V_{cb}| and of the parameters rho^2, R_1(1), and R_2(1), which fully characterize the form factors for the B0 -> D*- l+ nu_l decay in the framework of heavy-quark effective theory. The results, based on a selected sample of about 52,800 B0 -> D*- l+ nu_l decays, recorded by the BaBar detector, are rho2=1.157+-0.094+-0.027, R_1(1)=1.327+-0.131+-0.043, R_2(1)=0.859+-0.077+-0.021, and F(1)|V_cb|=(34.7+-0.4+-1.0)x10^-3. The first error is the statistical and the second is the systematic uncertainty. Combining these measurements with the previous BaBar measurement of the form factors, which employs a different fit technique on a partial sample of the data, we improve the statistical precision of the result, rho2=1.191+-0.048+-0.028, R_1(1)=1.429+-0.061+-0.044, R_2(1)=0.827+-0.038+-0.022, and F(1)|V_cb| = (34.4+-0.3+-1.1)x10^-3. Using lattice calculations for the axial form factor $\\mathcal{F}(1)$, we extract |V_cb| =(37.4+-0.3+-1.2+1.2-1.4)x10^-3, where the third error is due to the uncertainty in F(1). We also present a measurement of the exclusive branching fraction, B = (4.69+-0.04+-0.34)%.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2008-02-23T16:06:12.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "11.30.Er",
      "13.25.Hw",
      "12.15.Hh"
    ],
    "keywords": [
      "ckm matrix element",
      "decay b0",
      "determination",
      "cabibbo-kobayashi-maskawa matrix element",
      "axial form factor"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review D",
      "year": 2008,
      "month": "Feb",
      "volume": 77,
      "number": 3,
      "pages": "032002"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 18,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 751589,
      "adsabs": "2008PhRvD..77c2002A"
    }
  }
}