Electromagnetic probes of dense matter in heavy-ion collisions
Abstract
Dilepton and photon production in heavy-ion collisions at SPS energies are studied in the relativistic transport model that incorporates self-consistently the change of hadron masses in dense matter. It is found that the dilepton spectra in proton-nucleus reactions can be well described by the conventional mechanism of Dalitz decay and direct vector meson decay. However, to provide a quantitative explanation of the observed dilepton spectra in central heavy-ion collisions requires contributions other than these direct decays and also various medium effects. Introducing a decrease of vector meson masses in hot dense medium, we find that these heavy-ion data can be satisfactorily explained. Furthermore, the single photon spectra in our calculations with either free or in-medium meson masses do not exceed the upper bound deduced from the experiments by the WA80 Collaboration.
Keywords
Cite
@article{arxiv.nucl-th/9706022,
title = {Electromagnetic probes of dense matter in heavy-ion collisions},
author = {G. Q. Li and G. E. Brown and C. M. Ko},
journal= {arXiv preprint arXiv:nucl-th/9706022},
year = {2009}
}
Comments
8 pages, including 4 postscript figures. Talk presented at Sixth International Conference on Nucleus-Nucleus Collisions (NN97), Gatlinburg, June, 1997, to appear in the proceedings