Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1997-12-12
Physics
Nuclear Physics
Nuclear Theory
19 pages, including 7 ps figures. Based on talk presented at the APCTP (Asia Pacifit Center for Theoretical Physics) Workshop
Scientific paper
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 $\pi a_1\to l{\bar l}$ 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.
Brown Gerald E.
Gale Charles
Ko Che Ming
Li Gu-Qiang
No associations
LandOfFree
Electromagnetic Probes of Dense Matter in Relativistic Heavy-Ion Collisions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Electromagnetic Probes of Dense Matter in Relativistic Heavy-Ion Collisions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electromagnetic Probes of Dense Matter in Relativistic Heavy-Ion Collisions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-421006