1996/09/02 by Che Ming Ko, C. M. Ko, G. Q. Li +3 · 38 citations
Physics and Astronomy · #Heavy ion #High-Energy Particle Collisions Research #Ion #Mass spectrum #Meson #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Physics #Proton #Quantum Chromodynamics and Particle Interactions #Spectral line #Vector meson #nucl-th
paper · pdf · doi:10.1016/s0375-9474(96)00368-5
published in Nuclear Physics A 610, 342-349 (Elsevier BV) · 8 pages, LaTeX, figures available from [email protected], contribution to QM'96, to appear in the proceedings
arxiv created 1996/09/02 · openalex publication_date 1996/12/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Dilepton production in proton- and nucleus-induced reactions at SPS energies is studied in the relativistic transport model using initial conditions determined by the string dynamics from RQMD. It is found that both the CERES and HELIOS-3 data for 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 S+Au and S+W collisions requires contributions other than these direct decays. Introducing a decrease of vector meson masses in hot dense medium, we find that these heavy-ion data can also be satisfactorily explained. We also give predictions for Pb+Au collisions at 160 GeV/nucleon using current CERES mass resolution and acceptance.