Speaker
Dr
Volodymyr Konchakovski
(Institute for Theoretical Physics, Giessen University)
Description
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 a 3-Fluid hydroDynamics (3FD) approach. We clarify the role
of partonic degrees of freedom in the 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 Equation of States (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-pbar annihilation and the inverse processes for p-bar pair creation
from multi-meson interactions. 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.
Author
Dr
Volodymyr Konchakovski
(Institute for Theoretical Physics, Giessen University)
Co-authors
Prof.
Viacheslav Toneev
(JINR, Dubna, Russia)
Prof.
Wolfgang Cassing
(University of Giessen)
Prof.
Yuri Ivanov
(Kurchatov Institute, Moscow, Russia)
