{
  "annotation_id": "5cd53b0a-9437-44d1-8b35-d2b6980103ee",
  "date_created": "2026-03-02T18:00:04.340000Z",
  "date_modified": "2026-03-02T18:00:04.340000Z",
  "file_hash": "ffe83c343b59630546b9fb4ca290e538775e4ac4fb8628a08a9d18ff4f42d776",
  "private": false,
  "record": {
    "abstract": "A fit of the experimental data to the total cross section of the process\n\\gamma\\gamma-\u003e\\pi^0\\pi^0 in the energy region from 270 to 2250 MeV has been\ncarried out using dispersion relations for the invariant amplitudes where the\nquadrupole polarizabilities are free parameters. As a result the sum and\ndifference of the electric and magnetic quadrupole polarizabilities of the\n\\pi^0 meson have been found for the first time:\n(\\alpha2+\\beta2)_\\pi^0=(-0.181+-0.004)*10^{-4}fm^5,\n(\\alpha2-\\beta2)_pi^0=(39.70+-0.02)*10^{-4}fm^5. In addition, dispersion sum\nrules have been constructed for this sum and difference, respectively. The\nvalues of (\\alpha2-\\beta2)_\\pi^0 and (\\alpha2+\\beta2)_\\pi^0 extracted from the\nexperimental data on the process \\gamma\\gamma-\u003e\\pi^0\\pi^0 are in good agreement\nwith the result of calculations in the framework of these dispersion sum rules.",
    "arxiv_id": "nucl-th/0505058",
    "authors": [
      "L. V. Fil\u0027kov",
      "V. L. Kashevarov"
    ],
    "categories": [
      "nucl-th",
      "hep-ph",
      "nucl-ex"
    ],
    "doi": "10.1103/PhysRevC.72.035211",
    "journal_ref": "Phys.Rev.C72:035211,2005",
    "title": "Determination of \\pi^0 meson quadrupole polarizabilities from the   process \\gamma\\gamma -\u003e \\pi^0\\pi^0",
    "url": "https://arxiv.org/abs/nucl-th/0505058"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "884c74f4-396a-463e-babc-abc18de0260e",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}