Bonn 2020 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 34: Heavy-Ion Collisions and QCD Phases VII
HK 34.3: Talk
Wednesday, April 1, 2020, 17:15–17:30, J-HS F
Azimuthal anisotropy of virtual photons measured with HADES — •Dominique Dittert for the HADES collaboration — Technische Universität Darmstadt
In Au+Au collisions at √sNN = 2.42 GeV HADES observed a strong excess radiation which is remarkably well described assuming emission out of a thermalized system. The observation of a dilepton azimuthal anisotropy or the elliptic flow (v2) would add an important evidence for a collective expansion dynamics, and would thus shine extra light to the possible origin of the excess radiation. We present results for azimuthal anisotropy of e+ e− excess. To characterize the emitting source further, we study the orientation of the electron decay axis in the virtual photon rest (helicity) frame. Prospects for dilepton v2 from the Ag+Ag at √sNN = 2.55 GeV run will be shown.
Supported by BMBF ErUM-FSP C.B.M. (05P18RDFC1) and HGS-HIRe