dorsal/arxiv
View SchemaIntermediate-mass dilepton spectra and the role of secondary hadronic processes in heavy-ion collisions
| Authors | G. Q. Li, C. Gale |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9807005 |
| URL | https://arxiv.org/abs/nucl-th/9807005 |
| DOI | 10.1103/PhysRevC.58.2914 |
| Journal | Phys.Rev.C58:2914-2927,1998 |
Abstract
We carry out a study of intermediate-mass (between 1 and 2.5 GeV) dilepton spectra from hadronic interactions in heavy-ion collisions. The processes considered are $\pi\pi\to l{\bar l}$, $\pi\rho\to l{\bar l}$, $\pi a_1\to l{\bar l}$, $\pi\omega\to l{\bar l}$, $K{\bar K}\to l{\bar l}$, and $K{\bar K^*}+c.c \to l{\bar l}$. The elementary cross sections for those are obtained from chiral Lagrangians involving pseudoscalar, vector, and axial-vector mesons. The respective electromagnetic form factors are determined by fitting to experimental data for the reverse processes of $e^+e^-\to hadrons$. Based on this input we calculate cross sections and thermal dilepton emission rates and compare our results with those from other approaches. Finally we use these elementary cross sections with a relativistic transport model and calculate dilepton spectra in S+W collisions at SPS energies. The comparison of our results with experimental data from the HELIOS-3 collaboration indicates the importance of the secondary hadronic contributions to the intermediate-mass dilepton spectra.
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"abstract": "We carry out a study of intermediate-mass (between 1 and 2.5 GeV) dilepton\nspectra from hadronic interactions in heavy-ion collisions. The processes\nconsidered are $\\pi\\pi\\to l{\\bar l}$, $\\pi\\rho\\to l{\\bar l}$, $\\pi a_1\\to\nl{\\bar l}$, $\\pi\\omega\\to l{\\bar l}$, $K{\\bar K}\\to l{\\bar l}$, and $K{\\bar\nK^*}+c.c \\to l{\\bar l}$. The elementary cross sections for those are obtained\nfrom chiral Lagrangians involving pseudoscalar, vector, and axial-vector\nmesons. The respective electromagnetic form factors are determined by fitting\nto experimental data for the reverse processes of $e^+e^-\\to hadrons$. Based on\nthis input we calculate cross sections and thermal dilepton emission rates and\ncompare our results with those from other approaches. Finally we use these\nelementary cross sections with a relativistic transport model and calculate\ndilepton spectra in S+W collisions at SPS energies. The comparison of our\nresults with experimental data from the HELIOS-3 collaboration indicates the\nimportance of the secondary hadronic contributions to the intermediate-mass\ndilepton spectra.",
"arxiv_id": "nucl-th/9807005",
"authors": [
"G. Q. Li",
"C. Gale"
],
"categories": [
"nucl-th",
"hep-ph",
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],
"doi": "10.1103/PhysRevC.58.2914",
"journal_ref": "Phys.Rev.C58:2914-2927,1998",
"title": "Intermediate-mass dilepton spectra and the role of secondary hadronic processes in heavy-ion collisions",
"url": "https://arxiv.org/abs/nucl-th/9807005"
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