dorsal/arxiv
View SchemaIntermediate mass excess of dilepton production in heavy ion collisions at BEVALAC energies
| Authors | C. Ernst, S. A. Bass, M. Belkacem, H. Stöcker, W. Greiner |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9712069 |
| URL | https://arxiv.org/abs/nucl-th/9712069 |
| DOI | 10.1103/PhysRevC.58.447 |
| Journal | Phys.Rev.C58:447-456,1998 |
Abstract
Dielectron mass spectra are examined for various nuclear reactions recently measured by the DLS collaboration. A detailed description is given of all dilepton channels included in the transport model UrQMD 1.0, i.e. Dalitz decays of $\pi^0,\eta,\omega,\eta'$ mesons and of the $\Delta(1232)$ resonance, direct decays of vector mesons and $pn$ bremsstrahlung. The microscopic calculations reproduce data for light systems fairly well, but tend to underestimate the data in $pp$ at high energies and in $pd$ at low energies. These conventional sources, however, cannot explain the recently reported enhancement for nucleus-nucleus collisions in the mass region 0.15 GeV<$M_{ee}$<0.6 GeV. Chiral scaling and $\omega$ meson broadening in the medium are investigated as a source of this mass excess. They also cannot explain the recent DLS data.
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"abstract": "Dielectron mass spectra are examined for various nuclear reactions recently\nmeasured by the DLS collaboration. A detailed description is given of all\ndilepton channels included in the transport model UrQMD 1.0, i.e. Dalitz decays\nof $\\pi^0,\\eta,\\omega,\\eta\u0027$ mesons and of the $\\Delta(1232)$ resonance, direct\ndecays of vector mesons and $pn$ bremsstrahlung. The microscopic calculations\nreproduce data for light systems fairly well, but tend to underestimate the\ndata in $pp$ at high energies and in $pd$ at low energies. These conventional\nsources, however, cannot explain the recently reported enhancement for\nnucleus-nucleus collisions in the mass region 0.15 GeV\u003c$M_{ee}$\u003c0.6 GeV. Chiral\nscaling and $\\omega$ meson broadening in the medium are investigated as a\nsource of this mass excess. They also cannot explain the recent DLS data.",
"arxiv_id": "nucl-th/9712069",
"authors": [
"C. Ernst",
"S. A. Bass",
"M. Belkacem",
"H. St\u00f6cker",
"W. Greiner"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.58.447",
"journal_ref": "Phys.Rev.C58:447-456,1998",
"title": "Intermediate mass excess of dilepton production in heavy ion collisions at BEVALAC energies",
"url": "https://arxiv.org/abs/nucl-th/9712069"
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