Non-equilibrium dilepton production in hadronic transport approaches

Workshop for young scientists on the physics of ultrarelativistic nucleus-nucleus collisions 2016

Staudenmaier, Jan^1,2 ; Weil, Janus^1 ; Petersen, Hannah^1,2,3

Frankfurt Institute for Advanced Studies (FIAS), Ruth-Moufang-Straße 1, Frankfurt am Main

60438, Germany^1

Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, Max-von-Laue-Str. 1, Frankfurt am Main

60438, Germany^2

GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, Darmstadt

64291, Germany^3

关键词: Beam energies;    Collision energies;    Dilepton production;    Interaction mechanisms;    Invariant-mass spectra;    Non equilibrium;    Pion production;    Resonance decay;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/832/1/012037/pdf
DOI  :  10.1088/1742-6596/832/1/012037

来源: IOP

【 摘 要 】

In this work 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. The newly developed hadronic transport approach called SMASH (=Simulating Many Accelerated Strongly-interacting Hadrons) is introduced first. After explaining the basic interaction mechanisms, a comparison of elementary cross sections for pion production to experimental data is shown. The 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 such as invariant mass spectra are shown.