{
  "annotation_id": "bd13459d-40ed-4467-adad-4e9935e6a6b8",
  "date_created": "2026-03-02T18:01:21.513000Z",
  "date_modified": "2026-03-02T18:01:21.513000Z",
  "file_hash": "082bc362d9795f3cd3159dc4f444184c43af92da95778e3c5efb8981ba0160e0",
  "private": false,
  "record": {
    "abstract": "The feature of the low-lying spectrum and a complete set of quantum numbers\nof the (e+e+e-e-) system have been deduced based on symmetry consideration. The\nexistence of a low odd-parity L=1 excited state with the spins of the two\nelectrons coupled to s1=1 and the two positrons coupled to s2=0 (or s1=0 and\ns2=1) and a low even-parity L=0 excited state with s1=s2=1 have been predicted.\nThe discussion is generalized to 2-dimensional (e+e+e-e-) systems.",
    "arxiv_id": "physics/9805008",
    "authors": [
      "C. G. Bao"
    ],
    "categories": [
      "physics.atom-ph"
    ],
    "doi": "10.1016/S0375-9601(98)00192-3",
    "journal_ref": "Phys.Lett. A243 (1998) 215-222",
    "title": "Deduction of the quantum unmbers of low-lying states of the (e+e+e-e-)   system from symmetry consideration",
    "url": "https://arxiv.org/abs/physics/9805008"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "2c1ecefa-e4f2-47af-8108-979930705465",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}