{
  "annotation_id": "df302e2f-e419-4157-8d71-41b9ce112b3c",
  "date_created": "2026-03-02T18:00:25.253000Z",
  "date_modified": "2026-03-02T18:00:25.253000Z",
  "file_hash": "4b73c5f6ec1f841cc4c846bc5ef5596a1058eb0e5ff2ce97a6732ce82200a803",
  "private": false,
  "record": {
    "abstract": "We investigate the masses of the lowest c\\bar{c} states, the J/psi and eta_c,\nin nuclear matter using QCD sum rules. Up to dimension four, the differences\nbetween the operator product expansions in vacuum and in medium arise from the\ndensity-dependent change in the gluon condensate and from a new contribution\nproportional to the nucleon expectation value of the twist-2 gluon operator.\nBoth terms together give an attractive shift of about 5-10 MeV to the J/psi and\neta_c masses in nuclear matter.",
    "arxiv_id": "nucl-th/9811070",
    "authors": [
      "Frank Klingl",
      "Sungsik Kim",
      "Su Houng Lee",
      "Philippe Morath",
      "Wolfram Weise"
    ],
    "categories": [
      "nucl-th",
      "hep-ph"
    ],
    "doi": "10.1103/PhysRevLett.82.3396",
    "journal_ref": "Phys.Rev.Lett.82:3396-3399,1999; Erratum-ibid.83:4224,1999",
    "title": "J/psi and eta_c in the nuclear medium: QCD sum rule approach",
    "url": "https://arxiv.org/abs/nucl-th/9811070"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "d671fb5d-235e-4e44-a698-75463724665a",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}