{
  "annotation_id": "beaffd3a-b2cf-4159-91b9-47b448109a3a",
  "date_created": "2026-03-02T18:00:25.869000Z",
  "date_modified": "2026-03-02T18:00:25.869000Z",
  "file_hash": "0319cbbde2dd2469a7f8243ef6c1e5b8f70a91054fe19cdaa667fa3df9c5a26b",
  "private": false,
  "record": {
    "abstract": "Extraction of spin observables from vector meson photoproduction on a nucleon\ntarget is described. Starting from density matrix elements in the vector\nmeson\u0027s rest frame, we transform to spin observables in the photon-nucleon c.m.\nframe.\n  Several constraints on the transformed density matrix and on the spin\nobservables follow from requiring that the angular distribution and the density\nmatrix be positive definite. A set of constraints that are required in order to\nextract meaningful spin observables from forthcoming data are enunciated.",
    "arxiv_id": "nucl-th/9908068",
    "authors": [
      "W. M. Kloet",
      "Frank Tabakin"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.61.015501",
    "journal_ref": "Phys.Rev. C61 (2000) 015501",
    "title": "Constraints on vector meson photoproduction spin observables",
    "url": "https://arxiv.org/abs/nucl-th/9908068"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "474f6b92-c869-4a48-9c03-c7a122c47732",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}