Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1993-12-10
Phys.Rev.C49:2198-2202,1994
Physics
Nuclear Physics
Nuclear Theory
9 pages (latex) plus 4 figures (included as uuencoded postscript files), CERN-TH.7037/93. Replaced because of small change in
Scientific paper
10.1103/PhysRevC.49.2198
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.
Ko Che Ming
Seibert David
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