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Electromagnetic probes of dense matter in heavy-ion collisions

G. Q. Li·G. E. Brown·C. M. Ko
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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.

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G. Q. Li, G. E. Brown, C. M. Ko. 1997-06-07. Electromagnetic probes of dense matter in heavy-ion collisions. https://doi.org/10.1016/s0375-9474(97)00795-1

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