Global Polarization of Ξ Hyperons in Au + Au Collisions in the STAR Experiment

Vortical structure of hot-dense matter in heavy ion collisions can be probed through global polarization of emitted particles. Hyperon’s weak decays provides opportunity to measure this phenomenon. Global polarization of $$\Lambda $$ hyperons was measured by the STAR experiment at RHIC for Au + Au collisions with $$\sqrt {{{s}_{{NN}}}} $$ = 3–200 GeV and at the LHC for Pb + Pb collisions with $$\sqrt {{{s}_{{NN}}}} $$ = 2.76 and 5.02 TeV. Global polarization of multistrange hyperons, such as $$\Xi ,$$ can provide new information for hydrodynamic description of the system and its vorticity structure. In these proceedings, we report results of $$\Xi $$ global polarization measurement for Au + Au collisions at $$\sqrt {{{s}_{{NN}}}} $$ = 19.6 and 27 GeV.