{
  "annotation_id": "a85d0ceb-a0f4-4997-be6c-14a82966ae9c",
  "date_created": "2026-03-02T18:00:22.252000Z",
  "date_modified": "2026-03-02T18:00:22.252000Z",
  "file_hash": "f114b04b179ee03466d83fb6682099b0e3c6c7bff661b41ddfc6f60423bdbf9b",
  "private": false,
  "record": {
    "abstract": "We show how the gauge-invariance formulation given by Haberzettl is\nimplemented in practice for photoproduction amplitudes at the tree level with\nform factors describing composite nucleons. We demonstrate that, in contrast to\nOhta\u0027s gauge-invariance prescription, this formalism allows electric current\ncontributions to be multiplied by a form factor, i.e., it does not require that\nthey be treated like bare currents. While different in detail, this\nnevertheless lends support to previous ad hoc approaches which multiply the\nBorn amplitudes by an overall form factor. Numerical results for kaon\nphotoproduction off the nucleon are given. They show that the gauge procedure\nby Haberzettl leads to much improved $\\chi^2$ values as compared to Ohta\u0027s\nprescription.",
    "arxiv_id": "nucl-th/9804051",
    "authors": [
      "H. Haberzettl",
      "C. Bennhold",
      "T. Mart",
      "T. Feuster"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.58.R40",
    "journal_ref": "Phys.Rev.C58:R40-44,1998",
    "title": "Gauge-invariant tree-level photoproduction amplitudes with form factors",
    "url": "https://arxiv.org/abs/nucl-th/9804051"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "ff233c76-2415-45b8-af0a-9058f7f6e010",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}