{
  "annotation_id": "b1b625f3-0bae-491a-a302-cc3ca6ffcca9",
  "date_created": "2026-03-02T18:00:25.666000Z",
  "date_modified": "2026-03-02T18:00:25.666000Z",
  "file_hash": "a736bd0f9f7e18b272f0214fd947e923641babcf92bda9138ef5b98774d998a5",
  "private": false,
  "record": {
    "abstract": "The properties of $K^+$ and $K^-$ mesons are studied in nuclear reactions\nfrom SIS to RHIC energies within the covariant transport approach HSD in\ncomparison to the experimental data whenever available. Whereas kaon\nabundancies and spectra indicate little repulsive or vanishing selfenergies in\nthe medium, antikaons are found to experience strong attractive potentials in\nnucleus-nucleus collisions at SIS energies. However, even when including these\npotentials the $K^+$ and $K^-$ spectra at AGS energies are noticeably\nunderestimated showing an experimental excess of strangeness that points\ntowards a nonhadronic phase in these reactions. On the other hand the $K^+,\nK^-$ production at SPS energies is again well described by the HSD approach\nbased on quark, diquark, string and hadronic degress of freedom. At RHIC\nenergies hadronic rescatterings are found to enhance the strangeness yield from\nthe partonic phase quite substantially.",
    "arxiv_id": "nucl-th/9906072",
    "authors": [
      "W. Cassing"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1016/S0375-9474(99)85067-2",
    "journal_ref": "Nucl.Phys. A661 (1999) 468-471",
    "title": "Excitation function of strangeness in A+A reactions from SIS to RHIC   energies",
    "url": "https://arxiv.org/abs/nucl-th/9906072"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f28fdd77-1064-4b9d-b9db-e2106adb7866",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}