{
  "annotation_id": "c534f15c-bb8a-40b0-8a18-7c185cfe2052",
  "date_created": "2026-03-02T18:00:18.713000Z",
  "date_modified": "2026-03-02T18:00:18.713000Z",
  "file_hash": "5dd1cbf79cf246d18fc33018c8e9438f424a11789474f5a550c7d083085f5799",
  "private": false,
  "record": {
    "abstract": "We give predictions for the partial wave amplitudes of pion photoproduction\nnear threshold by means of dispersion relations at fixed t. The free parameters\nof this approach are determined by a fit to experimental data in the energy\nrange 160 MeV $\\le E_{\\gamma} \\le$ 420 MeV. The observables near threshold are\nfound to be rather sensitive to the amplitudes in the resonance region, in\nparticular to the $\\Delta$ (1232) and $N^*$ (1440). We obtain a good agreement\nwith the existing threshold data for both charged and neutral pion production.\nOur predictions also agree well with the results of chiral perturbation theory,\nexcept for neutral pion production off the neutron.",
    "arxiv_id": "nucl-th/9612057",
    "authors": [
      "O. Hanstein",
      "D. Drechsel",
      "L. Tiator"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1016/S0370-2693(97)00272-4",
    "journal_ref": "Phys.Lett. B399 (1997) 13-21",
    "title": "A dispersion theoretical approach to the threshold amplitudes of pion   photoproduction",
    "url": "https://arxiv.org/abs/nucl-th/9612057"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "b23bcfa3-d68a-4a40-a6cc-7ca70fc63ac4",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}