Speaker
Description
In non-central heavy-ion collisions emitted particles' spin can be polarized along the initial global angular
momentum due to spin-orbit coupling. Global polarization of hyperons is measured utilizing parity
violating weak decay of hyperons and is used to probe the vortical properties of the
system.
The STAR experiment at RHIC measured the global polarization of $\Lambda$
hyperons in Au+Au collisions at $\sqrt{s_{NN}}$ = 3-200 GeV, and similar measurements
were conducted at the LHC for Pb+Pb collisions at $\sqrt{s_{NN}}$ = 2.76 and 5.02 TeV. Measurement of multistrange hyperons have been only limited to top RHIC energy.
In this talk, we will report results of $\Xi$ global polarization for Au+Au collisions at $\sqrt{s_{NN}}$ = 14.6, 19.6 and $27\ \text{GeV}$. While $\Lambda$ global polarization was measured in wide energy range the energy dependence of
multistrange hyperon global polarization can provide new experimental input for understanding vortical properties of matter in heavy-ion collisions.
