{
  "annotation_id": "d9287c3b-6979-4a03-ba57-df5b16b3bd74",
  "date_created": "2026-03-02T18:00:08.357000Z",
  "date_modified": "2026-03-02T18:00:08.357000Z",
  "file_hash": "c728239b1a828886b9a009c796dbfc19d36791e775219fe3d366e39d354a7dbb",
  "private": false,
  "record": {
    "abstract": "We present an evaluation of a two-photon exchange correction to the cross\nsection for unpolarized $\\Delta$ isobar production in electron-proton\ncollisions, using a relativistic, crossing symmetric and gauge invariant\napproach. The calculated box and crossed-box diagrams include nucleon and\n$\\Delta$ intermediate states. We find a relation between the angular\nnonlinearity of the two-photon exchange contribution and the value of the\n$\\gamma \\Delta \\Delta$ coupling constant.",
    "arxiv_id": "nucl-th/0601063",
    "authors": [
      "S. Kondratyuk",
      "P. G. Blunden"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1016/j.nuclphysa.2006.07.038",
    "journal_ref": "Nucl.Phys.A778:44-52,2006",
    "title": "Calculation of two-photon exchange effects for $\\Delta$ production in   electron-proton collisions",
    "url": "https://arxiv.org/abs/nucl-th/0601063"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "b8dc5d60-c03e-49c1-af7d-e3daba916b4e",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}