WHAT CAN WE LEARN FROM A 2ND PHI-MESON PEAK IN ULTRARELATIVISTIC NUCLEAR COLLISIONS

被引:49
作者
KO, CM
SEIBERT, D
机构
[1] TEXAS A&M UNIV, DEPT PHYS, COLLEGE STN, TX 77843 USA
[2] CERN, DIV THEORY, CH-1211 GENEVA 23, SWITZERLAND
来源
PHYSICAL REVIEW C | 1994年 / 49卷 / 04期
基金
美国国家科学基金会;
关键词
D O I
10.1103/PhysRevC.49.2198
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
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 phipi --> KK*, phiK --> phiK, phirho --> KK, and phiphi --> 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.
引用
收藏
页码:2198 / 2202
页数:5
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