Electromagnetic probes of dense matter in relativistic heavy ion collisions
Oct, 1997
19 pages
Part of Properties of hadrons in matter. Proceedings, APCTP Workshop on astro-hadron physics, Seoul, Korea, October 25-31, 1997, 380-398
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Abstract:
Dilepton and photon production in heavy-ion collisions at SPS energies is 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 mechanisms of Dalitz decay, primary vector meson decay, decay of charmed mesons, and the initial Drell-Yan processes. 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 the low-mass dilepton enhancement can be satisfactorily explained. Furthermore, to explain the intermediate-mass dilepton enhancement in heavy-ion collisions, secondary processes such as are found to be very important. Finally, the single photon spectra in our calculations with either free or in-medium meson masses do not exceed the upper limit measured by the WA80 Collaboration.- talk: Seoul 1997/10/25
- scattering: heavy ion
- photon: emission
- lepton: pair production
- transport theory: relativistic
- hadron: mass
- matter: density
- p nucleus: nuclear reaction
- vector meson: mass
- mass spectrum: dilepton
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