{
  "annotation_id": "2d06d87a-f10c-44a4-959d-b9d0b01441f6",
  "date_created": "2026-03-02T18:00:19.127000Z",
  "date_modified": "2026-03-02T18:00:19.127000Z",
  "file_hash": "12b47067929c5edd463be81e21a6298ac560d49d27e61b499d3ab5bffad23369",
  "private": false,
  "record": {
    "abstract": "We consider a mechanism to create the $\\eta - \\eta\u0027$ mass difference by the\ngluon anomaly in a squeezed vacuum. We find that the mass shift of the $\\eta_0$\ngoverning this mass difference is determined by the magnetic part of the gluon\ncondensate. For the squeezed vacuum this magnetic part coincides with the total\ngluon condensate, so that we get a relation between the gluon condensate and\nthe mass shift of the $\\eta_0$ as a function of the strong coupling constant\n$\\alpha_s$. The values of the gluon condensate obtained through this relation\nare compared with the value by Shifman, Vainshtein and Zakharov and the recent\nupdate values by Narison.",
    "arxiv_id": "nucl-th/9609059",
    "authors": [
      "D. Blaschke",
      "H. -P. Pavel",
      "V. N. Pervushin",
      "G. R\u00f6pke",
      "M. K. Volkov"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1016/S0370-2693(97)00165-2",
    "journal_ref": "Phys.Lett. B397 (1997) 129-132",
    "title": "Squeezed condensate of gluons and $\\eta-\\eta\u0027$ mass difference",
    "url": "https://arxiv.org/abs/nucl-th/9609059"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f37dd05c-1ba4-442c-bab8-1f626131f061",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}