München 2019 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 48: Heavy-Ion Collisions and QCD Phases IX
HK 48.1: Gruppenbericht
Donnerstag, 21. März 2019, 14:00–14:30, HS 15
Electromagnetic radiation of hot and dense QCD matter formed in Au+Au collisions at √sNN=2.4 GeV — •Szymon Harabasz for the HADES collaboration — TU Darmstadt
In heavy-ion collisions at energies 1-2 GeV per nucleon the QCD matter reaches the baryon density a few times higher than normal nuclear matter density. Its properties can be studied by means of electromagnetic radiation.
HADES has investigated dileptons produced in N+N, N+A, A+A and π+A reactions in this energy regime. Spectra obtained in elementary hadron collisions support the validity of Vector Meson Dominance (VMD) model. The results from the largest system – Au+Au at √sNN=2.4 GeV – are characterized by nearly exponential shape of low invariant mass spectra. These findings suggest strong modification of vector meson spectral function in medium, due to coupling to abundant baryon resonances.
In this contribution, final results of differential data analysis will be presented and compared to the available model calculations. They will be accompanied by preliminary results on dilepton polarization and azimuthal anisotropy.