{
  "annotation_id": "98c7418f-0a21-4961-8ad8-84d3ed4f5b3f",
  "date_created": "2026-03-02T18:00:22.363000Z",
  "date_modified": "2026-03-02T18:00:22.363000Z",
  "file_hash": "301ebaba7fc09d4ed1d01c2a9cea258c992259f82e2944de918ef0192f1b5151",
  "private": false,
  "record": {
    "abstract": "A model calculation for pion production in nucleon-nucleon collisions is\npresented. Direct production, pion rescattering and contributions from pair\ndiagrams are taken into account. The amplitudes for the elementary processes\nare based on well established microscopic models of nucleon-nucleon and\npion-nucleon scattering. The $\\Delta (1232)$ is included explicitly and is\nfound to play an important role even at energies close to production threshold.\nA good overall agreement with existing data from the pion production threshold\nup to the Delta resonance region is achieved.",
    "arxiv_id": "nucl-th/9808020",
    "authors": [
      "C. Hanhart",
      "J. Haidenbauer",
      "O. Krehl",
      "J. Speth"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1016/S0370-2693(98)01385-9",
    "journal_ref": "Phys.Lett. B444 (1998) 25-31",
    "title": "Role of the $\\Delta$ isobar in the reaction $NN \\to NN\\pi$ near   threshold",
    "url": "https://arxiv.org/abs/nucl-th/9808020"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "d67910e3-8f08-4ef8-b84b-53fc6e2c986d",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}