dorsal/arxiv
View SchemaAnalysis of Dilepton Invariant Mass Spectrum in C+C at 2 and 1 AGeV
| Authors | M. Thomère, C. Hartnack, G. Wolf, J. Aichelin |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0702004 |
| URL | https://arxiv.org/abs/nucl-th/0702004 |
| DOI | 10.1103/PhysRevC.75.064902 |
| Journal | Phys.Rev.C75:064902,2007 |
Abstract
Recently the HADES collaboration has published the invariant mass spectrum of $e^+e^-$ pairs, dN/dM$_{e^+e^-}$, produced in C+C collisions at 2 AGeV. Using electromagnetic probes, one hopes to get in this experiment information on hadron properties at high density and temperature. Simulations show that firm conclusions on possible in-medium modifications of meson properties will only be possible when the elementary meson production cross sections, especially in the pn channel, as well as production cross sections of baryonic resonances are better known. Presently one can conclude that a) simulations overpredict by far the cross section at $M_{e^+e^-} \approx M_{\omega}{^0}$ if free production cross sections are used and that b) the upper limit of the $\eta$ decay into $e^+e^-$ is smaller than the present upper limit of the Particle Data Group. This is the result of simulations using the Isospin Quantum Molecular Dynamics (IQMD) approach.
{
"annotation_id": "88092871-5c36-4e52-b6d4-16f69e0a98fe",
"date_created": "2026-03-02T18:00:12.077000Z",
"date_modified": "2026-03-02T18:00:12.077000Z",
"file_hash": "663828f6973799866cccad4f2f936e5d209ce0e9707e136419d4ccb3772e31e8",
"private": false,
"record": {
"abstract": "Recently the HADES collaboration has published the invariant mass spectrum of\n$e^+e^-$ pairs, dN/dM$_{e^+e^-}$, produced in C+C collisions at 2 AGeV. Using\nelectromagnetic probes, one hopes to get in this experiment information on\nhadron properties at high density and temperature. Simulations show that firm\nconclusions on possible in-medium modifications of meson properties will only\nbe possible when the elementary meson production cross sections, especially in\nthe pn channel, as well as production cross sections of baryonic resonances are\nbetter known. Presently one can conclude that a) simulations overpredict by far\nthe cross section at $M_{e^+e^-} \\approx M_{\\omega}{^0}$ if free production\ncross sections are used and that b) the upper limit of the $\\eta$ decay into\n$e^+e^-$ is smaller than the present upper limit of the Particle Data Group.\nThis is the result of simulations using the Isospin Quantum Molecular Dynamics\n(IQMD) approach.",
"arxiv_id": "nucl-th/0702004",
"authors": [
"M. Thom\u00e8re",
"C. Hartnack",
"G. Wolf",
"J. Aichelin"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.75.064902",
"journal_ref": "Phys.Rev.C75:064902,2007",
"title": "Analysis of Dilepton Invariant Mass Spectrum in C+C at 2 and 1 AGeV",
"url": "https://arxiv.org/abs/nucl-th/0702004"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "4916d9a9-846c-4aa5-9c9c-e7f1ae308b2c",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
"version": "0.1.0"
},
"user_id": 1000002
}