Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 33: Schwerionenkollisionen und QCD Phasen
HK 33.1: Gruppenbericht
Mittwoch, 19. März 2014, 16:30–17:00, HZ 6
Photon and dilepton production across collision energies and centralities — •Olena Linnyk1, Elena Bratkovskaya2,3, and Wolfgang Cassing1 — 1Justus Liebig Universität Gießen, Gießen, Deutchland — 2Johann Wolfgang Goethe Universität, Frankfurt am Main, Deutchland — 3Frankfurt Institute for Advanced Studies, Frankfurt am Main, Deutchland
Real and virtual photons are established messengers of chiral symmetry restoration and deconfinement phase transition in heavy-ion collisions. We calculate the emission of photons and dileptons throughout the evolution of the heavy-ion collisions using the parton-hadron-string dynamics (PHSD) transport approach and interpret the recent observations of the strong photon elliptic flow at RHIC and LHC simultaneously with the precisely measured photon and dilepton spectra. This allows us to disentangle the individual hadronic and partonic emission sources and to conclude on the characteristics of the produced QCD matter -- the temperatures, densities and the degree of thermalisation reached, the lifetime of the QGP and the modification of vector mesons. Comparing the known sources to the data, we examine the possibility to accommodate new effects, such as the photon production in the initial pre-equilibrium phase and the dilepton production in the mixed phase. Additionally, we provide predictions for the dilepton spectra at LHC, the collision centrality dependence of the photon yield at RHIC, and the excitation function of the low-mass dilepton yield, thus investigating the potential of the dilepton measurements within the RHIC beam energy scan program, FAIR and NICA facilities.