dorsal/arxiv
View SchemaWhat can we learn from a second phi meson peak in ultrarelativistic nuclear collisions?
| Authors | Che Ming Ko, David Seibert |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9312010 |
| URL | https://arxiv.org/abs/nucl-th/9312010 |
| DOI | 10.1103/PhysRevC.49.2198 |
| Journal | Phys.Rev.C49:2198-2202,1994 |
Abstract
The decay width of a phi meson is reduced from its vacuum value as its mass decreases in hot hadronic matter as a result of the partial restoration of chiral symmetry. This reduction is, however, cancelled by collisional broadening through the reactions $\phi\pi\to KK^*$, $\phi K\to\phi K$, $\phi\rho\to KK$, and $\phi\phi\to KK$. The resulting phi meson width in hot hadronic matter is found to be less than about 10 MeV for temperatures below 200 MeV. If hadronic matter has a strong first-order phase transition, this narrow phi meson with reduced mass will appear as a second peak in the dilepton spectrum in ultrarelativistic heavy ion collisions. We discuss use of this second phi peak to determine the transition temperature and the lifetime of the two-phase coexistence region in the case of a strong first-order phase transition. We also discuss using the peak to determine the range of temperatures over which the transition occurs in the case of a smooth but fast change in the entropy density.
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"abstract": "The decay width of a phi meson is reduced from its vacuum value as its mass\ndecreases in hot hadronic matter as a result of the partial restoration of\nchiral symmetry. This reduction is, however, cancelled by collisional\nbroadening through the reactions $\\phi\\pi\\to KK^*$, $\\phi K\\to\\phi K$,\n$\\phi\\rho\\to KK$, and $\\phi\\phi\\to KK$. The resulting phi meson width in hot\nhadronic matter is found to be less than about 10 MeV for temperatures below\n200 MeV. If hadronic matter has a strong first-order phase transition, this\nnarrow phi meson with reduced mass will appear as a second peak in the dilepton\nspectrum in ultrarelativistic heavy ion collisions. We discuss use of this\nsecond phi peak to determine the transition temperature and the lifetime of the\ntwo-phase coexistence region in the case of a strong first-order phase\ntransition. We also discuss using the peak to determine the range of\ntemperatures over which the transition occurs in the case of a smooth but fast\nchange in the entropy density.",
"arxiv_id": "nucl-th/9312010",
"authors": [
"Che Ming Ko",
"David Seibert"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.49.2198",
"journal_ref": "Phys.Rev.C49:2198-2202,1994",
"title": "What can we learn from a second phi meson peak in ultrarelativistic nuclear collisions?",
"url": "https://arxiv.org/abs/nucl-th/9312010"
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