Speaker
Prof.
Yuri B. Ivanov
(NRC "Kurchatov Institute")
Description
Analysis of directed flow (v1) of protons, antiprotons and pions in heavy-ion collisions is
performed in the range of collision energies $\displaystyle{\sqrt{s_{NN}}}=$ 2.7-39 GeV. Simulations have been done
within a three-fluid model em\-ploy\-ing a purely hadronic equation of state (EoS) and two versions of
the EoS with deconfinement transitions: a first-order phase transition and a smooth crossover
transition. The crossover EoS is unambiguously preferable for the description of the most part of
experimental data in this energy range. The directed flow indicates that the crossover
deconfinement transition takes place in semicentral Au+Au collisions in a wide range of collision
energies $\displaystyle{4<\sqrt{s_{NN}}<30}$ GeV. The obtained results suggest that the deconfinement EoS?s in the
quark-gluon sector should be stiffer at high baryon densities than those used in the calculation. The
latter finding is in agreement with that discussed in astrophysics.
