{
  "annotation_id": "01ec3999-28e0-4b1e-8a52-d68bf6845847",
  "date_created": "2026-03-02T18:00:25.365000Z",
  "date_modified": "2026-03-02T18:00:25.365000Z",
  "file_hash": "db0b2220266e28547c857578f95a954cd07685ddf6398a1a4249fbab00287c85",
  "private": false,
  "record": {
    "abstract": "Form factors in the nucleon-photon vertex with one off-shell nucleon are\ncalculated by dressing the vertex with pion loops up to infinite order. Cutting\nrules and dispersion relations are implemented in the model. Using the\nprescription of minimal substitution we construct a \\gamma \\pi N N vertex and\nshow that it has to be included in the model in order that the Ward-Takahashi\nidentity for the \\gamma N N vertex be fulfilled. The vertex is to be applied in\na coupled-channel K-matrix formalism for Compton scattering, pion\nphotoproduction and pion scattering. The form factors show a pronounced cusp\nstructure at the pion threshold. As an illustration of a consistent application\nof the model, we calculate the cross section of Compton scattering. To provide\ngauge invariance in Compton scattering, a four-point \\gamma \\gamma N N contact\nterm is constructed using minimal substitution.",
    "arxiv_id": "nucl-th/9906044",
    "authors": [
      "S. Kondratyuk",
      "O. Scholten"
    ],
    "categories": [
      "nucl-th"
    ],
    "title": "Non-perturbative model for the half-off-shell \\gamma N N vertex",
    "url": "https://arxiv.org/abs/nucl-th/9906044"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "928bbcdc-9f4c-4954-9857-18be1a8298da",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}