{
  "id": "nucl-th/0506087",
  "version": "v1",
  "published": "2005-06-30T15:50:22.000Z",
  "updated": "2005-06-30T15:50:22.000Z",
  "title": "Hadronic Matter is Soft",
  "authors": [
    "Ch. Hartnack",
    "H. Oeschler",
    "Joerg Aichelin"
  ],
  "comment": "4 pages, 2figures",
  "journal": "Phys.Rev.Lett.96:012302,2006",
  "doi": "10.1103/PhysRevLett.96.012302",
  "categories": [
    "nucl-th"
  ],
  "abstract": "The stiffness of the hadronic equation of state has been extracted from the production rate of $K^+$ mesons in heavy ion collisions around 1 $A$ GeV incident energy. The data are best described with a compressibility coefficient $\\kappa$ around 200 MeV, a value which is usually called ``soft''. This is concluded from a detailed comparison of the results of transport theories with the experimental data using two different procedures: (i) the energy dependence of the ratio of $K^+$ from Au+Au and C+C collisions and (ii) the centrality dependence of the $K^+$ multiplicities. It is demonstrated that input quantities of these transport theories which are not precisely known, like the kaon-nucleon potential, the $\\Delta N \\to N K^+ \\Lambda$ cross section or the life time of the $\\Delta$ in matter do not modify this conclusion.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2005-06-30T15:50:22.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "21.65.+f",
      "25.75.Dw"
    ],
    "keywords": [
      "hadronic matter",
      "transport theories",
      "heavy ion collisions",
      "gev incident energy",
      "hadronic equation"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. Lett."
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 686403
    }
  }
}