Münster 2017 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 3: Heavy Ion Collisions and QCD Phases II
HK 3.6: Vortrag
Montag, 27. März 2017, 18:15–18:30, F 3
Elliptic flow of virtual photons — •Dominique Dittert for the HADES collaboration — TU Darmstadt
The HADES at SIS18 (GSI, Darmstadt) investigates strongly interacting matter at high net-baryon densities and moderate temperatures, which resembles properties of QCD matter as they might exist in the interior of compact stellar objects. Virtual photons, that decay into dileptons, are penetrating probes which directly access the entire space-time-evolution of the fireball and escape from the collision zone without further interactions. Thus they provide unique information about the various stages of the collision. In non-central collisions the initial spatial eccentricity of the nuclear overlap region transforms into momentum anisotropies through the action of azimuthally anisotropic pressure gradients. The most dominant contribution to this anisotropic flow is the second fourier harmonic v2, the elliptic flow. The combined dependence of elliptic flow of dileptons on their transverse momentum and their invariant mass provides a rich landscape of structures, which allows to set the observational window on specific stages of the fireball evolution. First measurements of elliptic flow of dileptons at RHIC were just recently published by the STAR collaboration. To complement their results in the low mass region, the HADES experiment steps in. In this contribution the preliminary results on azimuthal anisotropy of e+e− excess radiation measured in Au+Au collisions at √sNN = 2.4 GeV will be presented. The extracted v1 and v2 components of dileptons with Mee < 150 MeV/c2 will be compared to the results obtained for the charged pions.