Directed flow in heavy-ion collisions from the PHSD transport approach

15th International Conference on Strangeness in Quark Matter

Palmese, A.^1 ; Cassing, W.^1

Institut für Theoretische Physik, Universität Gießen, Germany^1

关键词: Beam energies;    Charged pions;    First-order phase transitions;    Heavy ion collision;    High sensitivity;    Kinetic approach;    Model results;    Transport models;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/668/1/012075/pdf
DOI  :  10.1088/1742-6596/668/1/012075

来源: IOP

【 摘 要 】

Recent STAR data for the directed flow of protons, antiprotons, charged pions and kaons obtained within the beam energy scan (BES) 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 approach from √sNN ≈ 5-12 GeV which shows a high sensitivity to the hadronic potentials in the FAIR/NICA energy regime √sNN ≤ 8 GeV.