Speaker
Description
Using 3-fluid dynamical (3FD) model and microscopic transport model UrQMD,
we made predictions for the global polarization of Λ and anti-Λ hyperons
in Au+Au and Ag+Ag collisions at moderately relativistic collision
energies of √(s_NN ) = 2.4−11 GeV. The dependence of the polarization on
the centrality of the collision, as well as on the rapidity and transverse
momentum, is studied. The obtained results agree well with the available
experimental data. The polarization is predicted to reach a maximum or
plateau (depending on the equation of state and centrality) at
√(s_NN) ≈ 3 GeV. It is found that the global polarization increases with
increasing width of the rapidity interval in the central rapidity region.
The global polarization Λ and anti-Λ, originated from axial vortex effect
(AVE), was also calculated within the 3FD model. It is found that the
equation of state with the deconfinement transition leads to splitting in
polarization of Λ and anti-Λ in good agreement with the STAR data.
