{
  "id": "1708.03303",
  "version": "v1",
  "published": "2017-08-10T17:22:21.000Z",
  "updated": "2017-08-10T17:22:21.000Z",
  "title": "Two-photon exchange contribution to elastic $e^-$-proton scattering: Full dispersive treatment of $πN$ states and comparison with data",
  "authors": [
    "O. Tomalak",
    "B. Pasquini",
    "M. Vanderhaeghen"
  ],
  "comment": "43 pages, 21 figures",
  "categories": [
    "hep-ph",
    "nucl-ex",
    "nucl-th"
  ],
  "abstract": "We evaluate the two-photon exchange correction to the elastic electron-proton scattering cross section within a dispersive framework. Besides the elastic contribution, we account for all $\\pi N$ intermediate state contributions using the phenomenological MAID fit as an input. We develop a novel method for the analytical continuation of the two-photon exchange amplitudes into the unphysical region and generalize our previous work to the momentum transfer region $ 0.064~\\mathrm{GeV}^2 \\lesssim Q^2 \\lesssim 1~\\mathrm{GeV}^2$. We compare our results with recent OLYMPUS, CLAS and VEPP-3 data as well as with empirical fits and estimates in the forward angular region.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-08-10T17:22:21.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "two-photon exchange contribution",
      "full dispersive treatment",
      "comparison",
      "elastic electron-proton scattering cross section",
      "two-photon exchange correction"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 43,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}