dorsal/arxiv
View SchemaHadronic Matter is Soft
| Authors | Ch. Hartnack, H. Oeschler, Joerg Aichelin |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0506087 |
| URL | https://arxiv.org/abs/nucl-th/0506087 |
| DOI | 10.1103/PhysRevLett.96.012302 |
| Journal | Phys.Rev.Lett.96:012302,2006 |
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.
{
"annotation_id": "7f4a74da-6278-45cc-8f3c-8ef15fc14ad8",
"date_created": "2026-03-02T18:00:04.663000Z",
"date_modified": "2026-03-02T18:00:04.663000Z",
"file_hash": "eb344b2c33e09a7e761755aae2dca0181e715381858a2e42a7171a02e13ff961",
"private": false,
"record": {
"abstract": "The stiffness of the hadronic equation of state has been extracted from the\nproduction rate of $K^+$ mesons in heavy ion collisions around 1 $A$ GeV\nincident energy. The data are best described with a compressibility coefficient\n$\\kappa$ around 200 MeV, a value which is usually called ``soft\u0027\u0027. This is\nconcluded from a detailed comparison of the results of transport theories with\nthe experimental data using two different procedures: (i) the energy dependence\nof the ratio of $K^+$ from Au+Au and C+C collisions and (ii) the centrality\ndependence of the $K^+$ multiplicities. It is demonstrated that input\nquantities of these transport theories which are not precisely known, like the\nkaon-nucleon potential, the $\\Delta N \\to N K^+ \\Lambda$ cross section or the\nlife time of the $\\Delta$ in matter do not modify this conclusion.",
"arxiv_id": "nucl-th/0506087",
"authors": [
"Ch. Hartnack",
"H. Oeschler",
"Joerg Aichelin"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevLett.96.012302",
"journal_ref": "Phys.Rev.Lett.96:012302,2006",
"title": "Hadronic Matter is Soft",
"url": "https://arxiv.org/abs/nucl-th/0506087"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "b52a6f0c-3ac1-460e-9398-bdec1e5a9670",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
"version": "0.1.0"
},
"user_id": 1000002
}