Intermediate mass excess of dilepton production in heavy ion collisions at relativistic energies

Published

Journal Article

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 [Formula Presented] mesons and of the [Formula Presented] resonance, direct decays of vector mesons and [Formula Presented] bremsstrahlung. The microscopic calculations reproduce data for light systems fairly well, but tend to underestimate the data in [Formula Presented] at high energies and in [Formula Presented] at low energies. These conventional sources, however, cannot explain the recently reported enhancement for nucleus-nucleus collisions in the mass region [Formula Presented] Chiral scaling and [Formula Presented] meson broadening in the medium are investigated as a source of this mass excess. They also cannot explain the recent DLS data. © 1998 The American Physical Society.

Full Text

Duke Authors

Cited Authors

  • Ernst, C; Bass, SA; Belkacem, M; Stöcker, H; Greiner, W

Published Date

  • January 1, 1998

Published In

Volume / Issue

  • 58 / 1

Start / End Page

  • 447 - 456

Electronic International Standard Serial Number (EISSN)

  • 1089-490X

International Standard Serial Number (ISSN)

  • 0556-2813

Digital Object Identifier (DOI)

  • 10.1103/PhysRevC.58.447

Citation Source

  • Scopus