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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 17.1: Group Report

Tuesday, February 27, 2018, 14:00–14:30, HZO 60

Study of electromagnetic radiation from hot and dense medium formed in Au+Au collisions at sNN=2.42 GeV* — •Szymon Harabasz for the HADES collaboration — TU Darmstadt

In heavy-ion collisions at energies 1-2 GeV per nucleon the medium is formed with baryon density a few times higher than normal nuclear matter density. The unique tool to study properties of such medium is electromagnetic radiation.

HADES has investigated virtual photons produced in N+N, N+A, A+A and π+A reactions in this energy regime. The results from the largest system – Au+Au at √sNN=2.42 GeV – reveal nearly exponential low invariant mass spectra after subtracting properly contributions of first-chance NN collisions, and hadron decays at freeze-out. These findings suggest strong modification of vector meson spectral function, due to coupling to abundant baryon resonances, in accordance with significant drop of chiral condensate at such high densities.

In this contribution, first results of differential data analysis will be presented and compared to the available theory model calculations.

*This work has been supported by VH-NG-823, Helmholtz Alliance HA216/EMMI and GSI.

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