{
  "annotation_id": "9d2a8a02-8e68-4a4e-a266-14e61890701f",
  "date_created": "2026-03-02T18:00:17.931000Z",
  "date_modified": "2026-03-02T18:00:17.931000Z",
  "file_hash": "d4694e52c4c09f686a9ec61fabcdd29a40590ab8da6f5a88880881702d6cf1a7",
  "private": false,
  "record": {
    "abstract": "The contribution of the two-step process gamma + d -\u003e p + n -\u003e pi0 + d to the\nimaginary part of the amplitude for coherent pion production on the deuteron is\ncalculated exploiting unitarity constraints. The result shows that this\nabsorptive process is not negligible and has to be considered in an extraction\nof the elementary neutron production amplitude from the gamma + d -\u003e pi0 + d\ncross section at threshold. In addition, it is argued that a consistent\ncalculation of gamma + d -\u003e pi0 + d in baryon chiral perturbation theory beyond\nnext-to-leading order requires the inclusion of this absorptive process.",
    "arxiv_id": "nucl-th/9703037",
    "authors": [
      "P. Wilhelm"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.56.R1215",
    "title": "Unitarity constraint for threshold coherent pion photoproduction on the   deuteron and chiral perturbation theory",
    "url": "https://arxiv.org/abs/nucl-th/9703037"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e14fbf47-2c1c-4362-806b-598da3276636",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}