{
  "annotation_id": "41b1221f-858a-4e46-8693-e805b61be51e",
  "date_created": "2026-03-02T18:00:00.336000Z",
  "date_modified": "2026-03-02T18:00:00.336000Z",
  "file_hash": "7c4cf203199ec951b85e8fa33388680830902a40b81bd1c02d085a457ce06cf7",
  "private": false,
  "record": {
    "abstract": "In the present paper we investigate pi0 pi0 and pi(+/-)pi0 photoproduction\noff complex nuclei at incident beam energies of 400-460 MeV. Simulations of two\npion photoproduction on protons and nuclei are performed by means of a\nsemi-classical BUU transport model including a full coupled-channel treatment\nof the final state interactions. Elastic scattering of the final state pions\nwith the nucleons in the surrounding nuclear medium is found to yield a\ndownward shift of the pi pi invariant mass distribution. We show that the\ntarget mass dependence of the pi0 pi0 invariant mass spectrum as measured by\nthe TAPS collaboration can be explained without introducing medium effects\nbeyond absorption and quasi-elastic scattering of the final state particles. On\nthe other hand, we find considerable discrepancies with the data in the\npi(+/-)pi0 channel, which are not understood.",
    "arxiv_id": "nucl-th/0401042",
    "authors": [
      "P. Muhlich",
      "L. Alvarez-Ruso",
      "O. Buss",
      "U. Mosel"
    ],
    "categories": [
      "nucl-th",
      "hep-ph",
      "nucl-ex"
    ],
    "doi": "10.1016/j.physletb.2004.05.054",
    "journal_ref": "Phys.Lett. B595 (2004) 216-222",
    "title": "Low-energy pi pi photoproduction off nuclei",
    "url": "https://arxiv.org/abs/nucl-th/0401042"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "ae6fbca8-2a32-49f6-aec1-90eee914c47b",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}