{
  "annotation_id": "d3cc3645-a7d4-4fbe-b2b7-ab477b7118f9",
  "date_created": "2026-03-02T18:01:52.499000Z",
  "date_modified": "2026-03-02T18:01:52.499000Z",
  "file_hash": "32b6136e0d2539e17e2d609e4e7c8daf5d670d9a38c15451953deea7b7263bae",
  "private": false,
  "record": {
    "abstract": "There are a number of papers dedicated to the description of free particles\nand antiparticles with zero mass and spin 1/2. A great many equations with\ndifferent C, P, T properties have been proposed and the impression could be\nformed that there are many nonequivalent theories for zero-mass particles. The\npurpose or this paper is to show that it is not the case and to describe all\nnonequivalent equations.",
    "arxiv_id": "quant-ph/0206109",
    "authors": [
      "Wilhelm I. Fushchych",
      "Anatoly G. Nikitin"
    ],
    "categories": [
      "quant-ph",
      "math-ph",
      "math.MP",
      "nlin.SI"
    ],
    "journal_ref": "Lett.Nuovo Cim. 7 (1973) 439-442",
    "title": "On the possible types of equations for zero-mass particles",
    "url": "https://arxiv.org/abs/quant-ph/0206109"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "32935bf5-b105-4c96-ad7c-1ead774f534d",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}