Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 4: Schwerionenkollisionen und QCD Phasen
HK 4.4: Vortrag
Montag, 4. März 2013, 12:00–12:15, HSZ-204
Studies of dilepton production with the UrQMD transport model — •Stephan Endres1,2 and Marcus Bleicher1,2 — 1Institut für Theoretische Physik, Universität Frankfurt, Max-von-Laue-Str. 1, D-60438 Frankfurt — 2Frankfurt Institute for Advanced Studies (FIAS), Ruth-Moufang-Str. 1, D-60438 Frankfurt
We present our ongoing studies of dilepton production within the UrQMD
transport approach, with focus on SIS energies. Resulting invariant
mass, transverse momentum and rapidity spectra for elementary and
heavy-ion collisions are compared to available data. Dilepton
contributions from the different production channels and respective
cross-sections are investigated in detail. A special focus is set on
the ρ-meson properties and its production, as it is assumed to
significantly change its spectral function in the medium. We also
calculated dilepton spectra using thermal emission from a coarse
grained version of UrQMD for heavy-ion collisions. For this we
accumulate an ensemble of events, determine local temperature and
chemical potential in small space-time cells and directly calculate
thermal emission rates. By this we avoid some problems of the hadronic
transport approach, as the restriction to two-particle processes and
baryon resonance interactions in the medium with unknown
cross-sections and branching ratios. The outcome is compared with the
pure transport results.
Supported by BMBF and the Hessian LOEWE initiative through the Helmholtz
International Center for FAIR (HIC for FAIR).