1997/10/31 by E. L. Bratkovskaya, E.L. Bratkovskaya, W. Cassing +3 · 65 citations
Chemistry · Physics and Astronomy · #Chemistry #High-Energy Particle Collisions Research #Meson #Momentum (technical analysis) #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Pion #Polarization (electrochemistry) #Production (economics) #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Scaling #Scattering #Spectral function #Spectral line #nucl-th
paper · pdf · doi:10.1016/s0375-9474(98)00135-3
published in Nuclear Physics A 634(1-2), 168-189 (Elsevier BV) · 35 pages, ReVTeX, including 11 postscript figures, UGI-97-06, Nucl. Phys. A, in press
arxiv created 1998/02/02 · openalex publication_date 1998/05/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present a dynamical study of e+e- production in C + C and Ca + Ca collisions at BEVALAC/SIS energies on the basis of the covariant transport approach HSD employing momentum-dependent ρ-meson spectral functions that include the pion modifications in the nuclear medium as well as the polarization of the ρ-meson due to resonant ρ- N scattering. We find that the experimental data from the DLS collaboration cannot be described within the ρ-meson spectral function approach. A dropping η-mass scenario leads to a good reproduction of the DLS dilepton data, however, violates the mT-scaling of π0 and η spectra as observed by the TAPS collaboration as well as η photoproduction on nuclei.