What can we Learn from a 2nd Phi-Meson Peak in Ultrarelativistic Nuclear Collisions
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Date
1994
Authors
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Journal ISSN
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Publisher
American Physical Society
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 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.
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Journals published by the American Physical Society can be found at http://publish.aps.org/
Keywords
QCD TRANSITION-TEMPERATURE, HOT HADRONIC MATTER, EXCHANGE MODEL, SCATTERING, Physics
Citation
Che Ming Ko and D. Seibert. Phys.Rev.C 49 2198-2202 1994. "Copyright (1994) by the American Physical Society."