Strangeness in Quark Matter 2022 (SQM 2022)

Differential study of Λ-hyperon polarization in a few-GeV regime within transport model approach

POS-BLK-05

14 Jun 2022, 17:10

1h 50m

Metaverse

Board: BLK-05

Poster Bulk matter phenomena, QCD phase diagram, and Critical point Poster

Speaker

Mr Oleksandr Vitiuk (University of Wroclaw, Institute of Theoretical Physics)

Description

We present a systematic study of $\Lambda$ hyperon polarization in heavy-ion collisions at HADES energies within the framework of microscopic transport model UrQMD combined with the hadron-resonance gas statistical model. This study demands a complex analysis of the fireball evolution including time slices, extraction of temperature and chemical potentials, as well as freeze-out conditions of Λ hyperons and study of the formation and space-time evolution of thermal vorticity. Two systems and four impact parameters are considered: Au+Au at $\sqrt{s_{NN}} = 2.42$ GeV and Ag+Ag at $\sqrt{s_{NN}} = 2.55$ GeV with $ b=3.0,5.5,7.5,9.0$ fm. Rapidity and transverse momentum dependence of the polarization are obtained and show a good agreement with preliminary experimental data as well as centrality and energy dependence of global polarization.

Presentation materials

SQM_2022_Poster.pdf