Bochum 2018 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 17: Heavy Ion Collisions and QCD Phases III
HK 17.2: Talk
Tuesday, February 27, 2018, 14:30–14:45, HZO 60
Dilepton production and resonance properties within a new hadronic transport approach — •Jan Staudenmaier1,2 and Hannah Petersen1,2,3 — 1Frankfurt Institute for Advanced Studies (FIAS), Ruth-Moufang-Straße 1, 60438 Frankfurt am Main — 2Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, Max-von-Laue-Str. 1, 60438 Frankfurt am Main — 3GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt
The dilepton emission in heavy-ion reactions at low beam energies is examined within a hadronic transport approach. In this talk the production of electron-positron pairs from a new approach named SMASH (Simulating Many Accelerated Strongly-interacting Hadrons) is introduced. The dilepton emission is consistently taken into account below the hadronic threshold. The calculations are systematically confronted with HADES data. The present approach employing a resonance treatment based on vacuum properties is validated by an excellent agreement with experimental data up to system sizes of carbon-carbon collisions. After establishing this well-understood baseline in elementary and small systems, the significance of medium effects is investigated with a coarse-graining approach based on the same hadronic evolution. The effect of explicit in-medium modifications to the vector meson spectral functions is important for dilepton invariant mass spectra in ArKCl and larger systems, even though the transport approach with vacuum properties reveals similar features due the coupling to baryonic resonance and the intrinsically included collisional broadening.