dorsal/arxiv
View SchemaElectromagnetic Probes of Dense Matter in Relativistic Heavy-Ion Collisions
| Authors | G. Q. Li, G. E. Brown, C. Gale, C. M. Ko |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9712048 |
| URL | https://arxiv.org/abs/nucl-th/9712048 |
Abstract
Dilepton and photon production in heavy-ion collisions at SPS energies is studied in the relativistic transport model that incorporates self-consistently the change of hadron masses in dense matter. It is found that the dilepton spectra in proton-nucleus reactions can be well described by the conventional mechanisms of Dalitz decay, primary vector meson decay, decay of charmed mesons, and the initial Drell-Yan processes. However, to provide a quantitative explanation of the observed dilepton spectra in central heavy-ion collisions requires contributions other than these direct decays and also various medium effects. Introducing a decrease of vector meson masses in hot dense medium, we find that the low-mass dilepton enhancement can be satisfactorily explained. Furthermore, to explain the intermediate-mass dilepton enhancement in heavy-ion collisions, secondary processes such as $\pi a_1\to l{\bar l}$ are found to be very important. Finally, the single photon spectra in our calculations with either free or in-medium meson masses do not exceed the upper limit measured by the WA80 Collaboration.
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"abstract": "Dilepton and photon production in heavy-ion collisions at SPS energies is\nstudied in the relativistic transport model that incorporates self-consistently\nthe change of hadron masses in dense matter. It is found that the dilepton\nspectra in proton-nucleus reactions can be well described by the conventional\nmechanisms of Dalitz decay, primary vector meson decay, decay of charmed\nmesons, and the initial Drell-Yan processes. However, to provide a quantitative\nexplanation of the observed dilepton spectra in central heavy-ion collisions\nrequires contributions other than these direct decays and also various medium\neffects. Introducing a decrease of vector meson masses in hot dense medium, we\nfind that the low-mass dilepton enhancement can be satisfactorily explained.\nFurthermore, to explain the intermediate-mass dilepton enhancement in heavy-ion\ncollisions, secondary processes such as $\\pi a_1\\to l{\\bar l}$ are found to be\nvery important. Finally, the single photon spectra in our calculations with\neither free or in-medium meson masses do not exceed the upper limit measured by\nthe WA80 Collaboration.",
"arxiv_id": "nucl-th/9712048",
"authors": [
"G. Q. Li",
"G. E. Brown",
"C. Gale",
"C. M. Ko"
],
"categories": [
"nucl-th"
],
"title": "Electromagnetic Probes of Dense Matter in Relativistic Heavy-Ion Collisions",
"url": "https://arxiv.org/abs/nucl-th/9712048"
},
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