Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1997-12-21
Phys.Rev.C58:447-456,1998
Physics
Nuclear Physics
Nuclear Theory
26 pages, 9 figures, references updated
Scientific paper
10.1103/PhysRevC.58.447
Dielectron mass spectra are examined for various nuclear reactions recently measured by the DLS collaboration. A detailed description is given of all dilepton channels included in the transport model UrQMD 1.0, i.e. Dalitz decays of $\pi^0,\eta,\omega,\eta'$ mesons and of the $\Delta(1232)$ resonance, direct decays of vector mesons and $pn$ bremsstrahlung. The microscopic calculations reproduce data for light systems fairly well, but tend to underestimate the data in $pp$ at high energies and in $pd$ at low energies. These conventional sources, however, cannot explain the recently reported enhancement for nucleus-nucleus collisions in the mass region 0.15 GeV<$M_{ee}$<0.6 GeV. Chiral scaling and $\omega$ meson broadening in the medium are investigated as a source of this mass excess. They also cannot explain the recent DLS data.
Bass Steffen A.
Belkacem M.
Ernst Christoph
Greiner Walter
St{ö}cker H.
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