dorsal/arxiv
View SchemaSeeing phi meson through the dilepton spectra in heavy-ion collisions
| Authors | W. S. Chung, C. M. Ko, G. Q. Li |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9803059 |
| URL | https://arxiv.org/abs/nucl-th/9803059 |
| DOI | 10.1016/S0375-9474(98)00473-4 |
| Journal | Nucl.Phys. A641 (1998) 357-378 |
Abstract
Dilepton spectra from the decay of phi mesons produced in heavy-ion collisions at SIS/GSI energies ($\sim 2$ GeV/nucleon) are studied in the relativistic transport model. We include phi mesons produced from baryon-baryon, pion-baryon, and kaon-antikaon collisions. The cross sections for the first two processes are obtained from an one-boson-exchange model, while that for the last process is taken to be the Breit-Wigner form through the phi meson resonance. For dileptons with invariant mass near the phi meson peak, we also include contributions from neutron-proton bremsstrahlung, pion-pion annihilation, and the decay of rho and omega mesons produced in baryon-baryon and meson-baryon collisions. Effects due to medium modifications of the kaon and vector (rho, omega and phi) meson properties are investigated. We find that the kaon medium effects lead to a broadening of the dilepton spectrum as a result of the increase of phi meson decay width. Furthermore, the dropping of phi meson mass in nuclear medium leads to a shoulder structure in the dilepton spectrum besides the main peak at the bare phi meson mass. The experimental measurement of the dilepton spectra from heavy-ion collisions is expected to provide useful information about the phi meson properties in dense matter.
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"abstract": "Dilepton spectra from the decay of phi mesons produced in heavy-ion\ncollisions at SIS/GSI energies ($\\sim 2$ GeV/nucleon) are studied in the\nrelativistic transport model. We include phi mesons produced from\nbaryon-baryon, pion-baryon, and kaon-antikaon collisions. The cross sections\nfor the first two processes are obtained from an one-boson-exchange model,\nwhile that for the last process is taken to be the Breit-Wigner form through\nthe phi meson resonance. For dileptons with invariant mass near the phi meson\npeak, we also include contributions from neutron-proton bremsstrahlung,\npion-pion annihilation, and the decay of rho and omega mesons produced in\nbaryon-baryon and meson-baryon collisions. Effects due to medium modifications\nof the kaon and vector (rho, omega and phi) meson properties are investigated.\nWe find that the kaon medium effects lead to a broadening of the dilepton\nspectrum as a result of the increase of phi meson decay width. Furthermore, the\ndropping of phi meson mass in nuclear medium leads to a shoulder structure in\nthe dilepton spectrum besides the main peak at the bare phi meson mass. The\nexperimental measurement of the dilepton spectra from heavy-ion collisions is\nexpected to provide useful information about the phi meson properties in dense\nmatter.",
"arxiv_id": "nucl-th/9803059",
"authors": [
"W. S. Chung",
"C. M. Ko",
"G. Q. Li"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/S0375-9474(98)00473-4",
"journal_ref": "Nucl.Phys. A641 (1998) 357-378",
"title": "Seeing phi meson through the dilepton spectra in heavy-ion collisions",
"url": "https://arxiv.org/abs/nucl-th/9803059"
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