{
  "annotation_id": "c322e9a6-0a13-4b18-a04b-cb1d7b19b848",
  "date_created": "2026-03-02T18:00:18.911000Z",
  "date_modified": "2026-03-02T18:00:18.911000Z",
  "file_hash": "19dd9a63ceb8f5bcfc80fbcc9aef27704bcddf0c66ef7397a1e5e7eaf66d3bd6",
  "private": false,
  "record": {
    "abstract": "We present a unitary and gauge-invariant model with coupled channels, which\nprovides a consistent description of pion photoproduction off nucleons in the\nE$_{0+}$ channel and eta-meson photoproduction off protons and deuterons. An\neffective field theory with hadrons and photons is constructed, which includes\nnon-resonant Born terms as well as the S$_{11}$(1535) and S$_{11}$(1650) baryon\nresonances. Due to the coupling between the channels, the production of\neta-mesons is strongly affected by the S$_{11}$(1650) although its direct\ncoupling to the $\\eta$N channel is negligible. The rho- and omega-meson\nexchange terms are important for achieving a consistent description of both\npion- and photon-induced reactions.",
    "arxiv_id": "nucl-th/9701022",
    "authors": [
      "C. Deutsch-Sauermann",
      "B. Friman",
      "W. Noerenberg"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1016/S0370-2693(97)00886-1",
    "journal_ref": "Phys.Lett. B409 (1997) 51-57",
    "title": "eta-meson photoproduction off protons and deuterons",
    "url": "https://arxiv.org/abs/nucl-th/9701022"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e7d9a989-fba1-4bde-b79b-b4187051c6d3",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}