{
  "id": "nucl-th/0407069",
  "version": "v2",
  "published": "2004-07-21T15:22:29.000Z",
  "updated": "2004-08-02T15:16:53.000Z",
  "title": "$γ^{*}NΔ$ Form Factors from a Relativistic Dynamical Model of Pion Electroproduction",
  "authors": [
    "G. L. Caia",
    "V. Pascalutsa",
    "J. A. Tjon",
    "L. E. Wright"
  ],
  "comment": "9 pages, 5 figures, several small corrections, to be published in Phys. Rev. C",
  "journal": "Phys.Rev.C70:032201,2004",
  "doi": "10.1103/PhysRevC.70.032201",
  "categories": [
    "nucl-th",
    "hep-ph"
  ],
  "abstract": "We obtain the electromagnetic form factors of the $\\gamma N\\Delta$ transition by analyzing recent pion-electroproduction data using a fully relativistic dynamical model. Special care is taken to satisfy Ward-Takahashi identities for the Born term in the presence of form factors thereby allowing the use of realistic electromagnetic form factors of the nucleon and pion. We parametrize the $Q^2$ dependence of the {\\it bare} $\\gamma N \\Delta$ form factors by a three-parameter form which is consistent with the asymptotic behavior inferred from QCD. The parameters of the bare $\\gamma N \\Delta$ form factors are the only free parameters of the model and are fitted to the differential cross-section and multipole-analysis data up to $Q^2=4$ (GeV/c)$^2$ in the $\\Delta(1232)$-resonance region. This analysis emphasizes the significance of the pion-cloud effects in the extraction of the resonance parameters.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2004-08-02T15:16:53.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "13.60.Le",
      "12.38.Aw",
      "13.40.Gp",
      "14.20.Gk"
    ],
    "keywords": [
      "pion electroproduction",
      "realistic electromagnetic form factors",
      "satisfy ward-takahashi identities",
      "parameters",
      "resonance region"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. C"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 654973
    }
  }
}