{
  "id": "1012.1810",
  "version": "v2",
  "published": "2010-12-08T17:07:34.000Z",
  "updated": "2011-04-28T10:10:09.000Z",
  "title": "Analysis of the D+ --> K- pi+ e+ nu_e decay channel",
  "authors": [
    "The BABAR Collaboration",
    "P. del Amo Sanchez"
  ],
  "comment": "38 pages, 27 postscript figures, published by Phys. Rev. D",
  "journal": "Phys.Rev.D83:072001,2011",
  "doi": "10.1103/PhysRevD.83.072001",
  "categories": [
    "hep-ex"
  ],
  "abstract": "Using 347.5 fb-1 of data recorded by the BABAR detector at the PEP-II electron-positron collider, 244*10^3 signal events for the D+ --> K- pi+ e+ nu_e decay channel are analyzed. This decay mode is dominated by the \\bar{K}^*(892)^0 contribution. We determine the \\bar{K}^*(892)^0 parameters: m_{K^*(892)^0}=(895.4 +- 0.2 +- 0.2) MeV/c^{2}, \\Gamma^0_{K^*(892)^0}=(46.5 +- 0.3 +- 0.2) MeV/c^{2} and the Blatt-Weisskopf parameter $r_{BW}=2.1 +- 0.5 +- 0.5 (GeV/c)^{-1} where the first uncertainty comes from statistics and the second from systematic uncertainties. We also measure the parameters defining the corresponding hadronic form factors at q^{2}=0 (r_{V} = V(0) / A_{1}(0)=1.463 +- 0.017 +- 0.031, r_{2} = A_{2}(0) / A_{1}(0) = 0.801 +- 0.020 +- 0.020) and the value of the axial-vector pole mass parameterizing the q^2 variation of A_{1} and A_{2}: m_{A}=(2.63 +- 0.10 +- 0.13) GeV/c^{2}. The S-wave fraction is equal to (5.79 +- 0.16 +- 0.15)%. Other signal components correspond to fractions below 1%. Using the D+ --> K- pi+ pi+ channel as a normalization, we measure the D+ semileptonic branching fraction: BR(D+ --> K- pi+ e+ nu_e) = (4.04 +- 0.03 +- 0.04 +- 0.09) \\times 10^{-2} where the third uncertainty comes from external inputs. We then obtain the value of the hadronic form factor A_1 at q^{2}=0: A_{1}(0) = 0.6226 +- 0.0056 +- 0.0065 +- 0.0074. Fixing the P-wave parameters we measure the phase of the S-wave for several values of the Kpi mass. These results confirm those obtained with Kpi production at small momentum transfer in fixed target experiments.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2011-04-28T10:10:09.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "11.30.Er",
      "11.15.Ha",
      "13.20.Fc",
      "12.38.Gc"
    ],
    "keywords": [
      "decay channel",
      "pep-ii electron-positron collider",
      "third uncertainty comes",
      "corresponding hadronic form factors",
      "first uncertainty comes"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review D",
      "year": 2011,
      "month": "Apr",
      "volume": 83,
      "number": 7,
      "pages": "072001"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 38,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 879997,
      "adsabs": "2011PhRvD..83g2001D"
    }
  }
}