Speaker
Description
In this talk the non-equilibrium dilepton production from a hadronic transport approach (SMASH) is presented. The dilepton emission from the hadronic stage is of interest for current HADES results measured at GSI in the beam energy range from 1.25 - 3.5 GeV. Also at high collision energies (RHIC/LHC) the later dilute stages of the reaction are dominated by hadronic dynamics.
First, the employed hadronic transport approach called SMASH (=Simulating Many Accelerated Strongly-interacting Hadrons) is presented. After explaining the basic interaction mechanism, a comparison of elementary cross sections (e.g. pion production) to data is shown.
Then the description of dilepton production within SMASH is explained in detail. The main contribution to the dilepton spectra in the low energy regime of GSI/FAIR/RHIC-BES originates from resonance decays. Results of the dilepton production with SMASH including dilepton invariant mass spectra are shown and compared to HADES data. The dilepton spectrum also allows access to the electromagnetic transition form factors, which is studied under the hypothesis of vector-meson dominance in a transport picture[1]. The obtained results are compatible with NA60 data.
Furthermore, the possibility of employing the non-equilibrium dilepton production from a hadronic transport approach combined with a hydrodynamic approach (hybrid model) is explored.
ref. [1] J.Weil, J.Staudenmaier and H.Petersen, Dilepton production with the SMASH model, arXiv:1604.07028 [nucl-th], Proceedings Fairness 2016
