dorsal/arxiv
View SchemaEnhancement of low-mass dileptons in SPS heavy-ion collisions: possible evidence for dropping rho meson mass in medium
| Authors | C. M. Ko, G. Q. Li, G. E. Brown, H. Sorge |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9609008 |
| URL | https://arxiv.org/abs/nucl-th/9609008 |
| DOI | 10.1016/S0375-9474(96)00368-5 |
| Journal | Nucl.Phys. A610 (1996) 342c-349c |
Abstract
Dilepton production in proton- and nucleus-induced reactions at SPS energies is studied in the relativistic transport model using initial conditions determined by the string dynamics from RQMD. It is found that both the CERES and HELIOS-3 data for dilepton spectra in proton-nucleus reactions can be well described by the conventional mechanism of Dalitz decay and direct vector meson decay. However, to provide a quantitative explanation of the observed dilepton spectra in central S+Au and S+W collisions requires contributions other than these direct decays. Introducing a decrease of vector meson masses in hot dense medium, we find that these heavy-ion data can also be satisfactorily explained. We also give predictions for Pb+Au collisions at 160 GeV/nucleon using current CERES mass resolution and acceptance.
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"abstract": "Dilepton production in proton- and nucleus-induced reactions at SPS energies\nis studied in the relativistic transport model using initial conditions\ndetermined by the string dynamics from RQMD. It is found that both the CERES\nand HELIOS-3 data for dilepton spectra in proton-nucleus reactions can be well\ndescribed by the conventional mechanism of Dalitz decay and direct vector meson\ndecay. However, to provide a quantitative explanation of the observed dilepton\nspectra in central S+Au and S+W collisions requires contributions other than\nthese direct decays. Introducing a decrease of vector meson masses in hot dense\nmedium, we find that these heavy-ion data can also be satisfactorily explained.\nWe also give predictions for Pb+Au collisions at 160 GeV/nucleon using current\nCERES mass resolution and acceptance.",
"arxiv_id": "nucl-th/9609008",
"authors": [
"C. M. Ko",
"G. Q. Li",
"G. E. Brown",
"H. Sorge"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/S0375-9474(96)00368-5",
"journal_ref": "Nucl.Phys. A610 (1996) 342c-349c",
"title": "Enhancement of low-mass dileptons in SPS heavy-ion collisions: possible evidence for dropping rho meson mass in medium",
"url": "https://arxiv.org/abs/nucl-th/9609008"
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