QM 2022

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

6 Apr 2022, 19:06

4m

Poster Chirality, vorticity and spin polarization Poster Session 2 T02

Speaker

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

Description

We present a systematic study of $\mathrm{\Lambda }$ 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 baryonic chemical potentials, as well as freeze-out conditions of $\mathrm{\Lambda }$ 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

QM_2022_Poster.pdf