1997/02/27 by W. Cassing, Cassing, W.
Engineering · Materials Science · Physics and Astronomy · #Electron and X-Ray Spectroscopy Techniques #FOS: Physical sciences #Nuclear Theory (nucl-th) #Particle Accelerators and Free-Electron Lasers #Particle Detector Development and Performance #nucl-th
paper · pdf · doi:10.48550/arxiv.nucl-th/9702053
14 pages, LaTeX, 9 postscript figures included, Proc. of the Int. Research Workshop "Heavy-Ion Physics at Low, Intermediate and Relativistic Energies using $4π$ Detectors", Poiana Brasov, Romania, Oct. 7-14, 1996, World Scientific, Singapore, 1997, in press
arxiv created 1997/02/27 · openalex publication_date 1997/02/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The production and propagation of mesons (π, η, ρ, ω, Φ, K, K, J/Ψ) in proton-nucleus and nucleus-nucleus collisions from 1 - 200 GeV/u is studied within the covariant transport approach HSD, which explicitly allows to investigate selfenergy effects of the hadrons at finite baryon density. Whereas the experimental pion and K+ spectra can be described without introducing any selfenergies for the mesons, the K- yield in Ni + Ni collisions is underestimated by a factor of 5 - 7 at 1.66 and 1.85 GeV/u. However, introducing density dependent antikaon masses in line with effective chiral Lagrangians a satisfactory agreement with the data is achieved. A dropping of the ρ-meson mass with baryon density, as suggested by QCD sumrule studies, is proposed to explain the dilepton spectra for S + Au and Pb + Au at SPS energies, which indicates independently that a partial restoration of chiral symmetry might be found already in the present experiments.