Directed flow in relativistic heavy-ion collisions within the PHSD transport approach and 3FD hydrodynamical model

We analyze recent STAR data for the directed flow of protons, antiprotons and charged pions obtained within the beam energy scan program within the Parton-Hadron-String- Dynamics (PHSD) transport model and the 3-Fluid hydroDynamics (3FD) approach. We clarify the role of partonic degrees of freedom i...

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Bibliographic Details
Published in:Journal of physics. Conference series 2015-05, Vol.612 (1), p.12055
Main Authors: Konchakovski, V P, Cassing, W, Ivanov, Y B, Toneev, V D
Format: Article
Language:English
Subjects:
Antiparticles
Antiprotons
Crossovers
Heavy ions
Ionic collisions
Physics
Pions
Qualitative analysis
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Summary:We analyze recent STAR data for the directed flow of protons, antiprotons and charged pions obtained within the beam energy scan program within the Parton-Hadron-String- Dynamics (PHSD) transport model and the 3-Fluid hydroDynamics (3FD) approach. We clarify the role of partonic degrees of freedom in the kinetic PHSD approach. The PHSD results, simulating a partonic phase and its coexistence with a hadronic one, are roughly consistent with data. The hydrodynamic results are obtained for two EoS, a pure hadronic EoS and an EoS with a crossover type transition. The latter case is favored by the STAR experimental data. Special attention is paid to the description of antiproton directed flow based on the balance of p annihilation and the inverse processes for N pair creation from multi-meson interactions. Generally, a semi-qualitative agreement between the measured data and model results supports the idea of a crossover type quark-hadron transition which softens the nuclear EoS.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/612/1/012055