Parton/hadron dynamics in heavy-ion collisions at FAIR energies
1 Institut für Theoretische Physik, University of Giessen, Germany
2 Joint Institute for Nuclear Research, 141980 Dubna, Russia
3 Institut für Theoretische Physik, Johann Wolfgang Goethe University Frankfurt/M, Germany
a e-mail: Wolfgang.Cassing@theo.physik.uni-giessen.de
Published online: 29 May 2015
Recent STAR data for the directed flow of protons, antiprotons and charged pions obtained within the beam energy scan program are analyzed within the Parton-Hadron-String-Dynamics (PHSD/HSD) transport models. Both versions of the kinetic approach are used to clarify the role of partonic degrees of freedom. The PHSD results, simulating a partonic phase and its coexistence with a hadronic one, are roughly consistent with the STAR data. Generally, the semi-qualitative agreement between the measured data and model results supports the idea of a crossover type of quark-hadron transition which softens the nuclear EoS but shows no indication of a first-order phase transition. Furthermore, the directed flow of kaons and antikaons is evaluated in the PHSD/HSD approachesfrom √sNN ≈ 3 - 200 GeV which shows a high sensitivity to hadronic potentials in the FAIR/NICA energy regime √sNN ≤ 8 GeV.
© Owned by the authors, published by EDP Sciences, 2015
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