Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 7: Schwerionenkollisionen und QCD Phasen
HK 7.2: Vortrag
Montag, 19. März 2012, 14:30–14:45, P 5
The role of the ρ meson in the HADES dilepton mass spectra — •Claudia Behnke1, Tetyana Galatyuk1,2, and Joachim Stroth1,3 — 1Goethe-Universität, Frankfurt — 2ExtreMe Matter Institute EMMI, Darmstadt — 3GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt
Photons and lepton pairs emerging from decays of virtual photons are the most promising probes for studying dense hadronic matter.
In the energy domain of 1 - 2 GeV per nucleon, HADES has measured electron pairs in C+C, Ar+KCl, p+p, d+p and p+Nb collisions. For the first time, the electron pairs from quasi free n+p sub-reactions were reconstructed by detecting the proton spectator from the deuteron breakup. An experimentally constrained N+N reference spectrum was established. Moreover, for the first time at this energy the inclusive production cross sections of light vector mesons were extracted. These results allow for putting tight constraints on vector meson production in heavy-ion collisions at beam energies of few GeV per nucleon.
In this contribution, we compare the HADES data to predictions from UrQMD microscopic transport model calculations and introduce an approach which allows to separate in a transparent way the generation of the event background from the emission pattern of physics observables under consideration.
This work has been supported by BMBF (06 FY 9100 I), HIC for FAIR, EMMI and GSI.