{
  "id": "nucl-th/0302082",
  "version": "v1",
  "published": "2003-02-28T11:36:19.000Z",
  "updated": "2003-02-28T11:36:19.000Z",
  "title": "$K^-/K^+$ ratio in heavy-ion collisions at GSI with an antikaon self-energy in hot and dense matter",
  "authors": [
    "Laura Tolós",
    "Artur Polls",
    "Angels Ramos",
    "Jürgen Schaffner-Bielich"
  ],
  "comment": "20 pages, 6 figures, sent to Phys. Rev. C",
  "journal": "Phys.Rev. C68 (2003) 024903",
  "doi": "10.1103/PhysRevC.68.024903",
  "categories": [
    "nucl-th"
  ],
  "abstract": "The $K^-/K^+$ ratio produced in heavy-ion collisions at GSI energies is studied. The in-medium properties at finite temperature of the hadrons involved are included, paying a special attention to the in-medium properties of antikaons. Using a statistical approach, it is found that the determination of the temperature and chemical potential at freeze-out conditions compatible with the ratio $K^-/K^+$ is very delicate, and depends very strongly on the approximation adopted for the antikaon self-energy. The use of an energy dependent $\\bar{K}$ spectral density, including both s and p-wave components of the $\\bar{K}N$ interaction, lowers substantially the freeze-out temperature compared to the standard simplified mean-field treatment and gives rise to an overabundance of $K^-$ production in the dense and hot medium. Even a moderately attractive antikaon-nucleus potential obtained from our self-consistent many-body calculation does reproduce the ``broad-band equilibration'' advocated by Brown, Rho and Song due to the additional strength of the spectral function of the $K^-$ at low energies.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2003-02-28T11:36:19.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "25.75.Dw",
      "14.40.Ev",
      "13.75.Jz",
      "24.10.Pa"
    ],
    "keywords": [
      "antikaon self-energy",
      "heavy-ion collisions",
      "dense matter",
      "in-medium properties",
      "self-consistent many-body calculation"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. C"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 20,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 614269
    }
  }
}