{
  "annotation_id": "cb8b3e8e-e73d-46c9-8ac9-2deca95582d6",
  "date_created": "2026-03-02T18:00:01.363000Z",
  "date_modified": "2026-03-02T18:00:01.363000Z",
  "file_hash": "9666b8037f7d26ada7df9e48c24ee0ead25a8b5e1e5db10ab5f12eaf06d95c98",
  "private": false,
  "record": {
    "abstract": "The $K^-/K^+$ ratio in heavy-ion collisions at GSI is studied including the\nproperties of the participating hadrons in hot and dense matter, paying a\nparticular attention to the in-medium properties of antikaons at finite\ntemperature. The determination of the temperature and chemical potential at\nfreeze-out conditions compatible with the ratio $K^-/K^+$ is very delicate, and\ndepends on the approach adopted for the antikaon self-energy. Different\napproaches for the $K^-$ self-energy have been considered: non-interacting\n$K^-$, on-shell self-energy and single-particle spectral density. We observe\nthat the use of an energy dependent $\\bar{K}$ spectral density lowers\nconsiderably the freeze-out temperature with respect to the on-shell approach.\nWe also conclude that the full off-shell approach gives rise to the \"broad-band\nequilibration\" advocated by Brown, Rho and Song.",
    "arxiv_id": "nucl-th/0407035",
    "authors": [
      "L. Tolos",
      "J. Schaffner-Bielich",
      "A. Polls",
      "A. Ramos"
    ],
    "categories": [
      "nucl-th"
    ],
    "title": "In-medium properties of antikaons at finite temperature: the K^-/K^+   ratio at GSI",
    "url": "https://arxiv.org/abs/nucl-th/0407035"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "77194440-ded3-4fcc-853d-96229a33f69c",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}