LXXI International conference "NUCLEUS – 2021. Nuclear physics and elementary particle physics. Nuclear physics technologies"

Global polarization of $\Xi$ hyperons in Au+Au collisions in the STAR experiment

21 Sept 2021, 14:40

25m

Oral report Section 4. Relativistic nuclear physics, elementary particle physics and high-energy physics. Section 4. Relativistic nuclear physics, elementary particle physics and high-energy physics

Speaker

Egor Alpatov (NRNU MEPhI)

Description

The hot dense matter produced in non-central heavy-ion collisions possess a large initial orbital angular momentum. This initial orbital angular momentum leads to global polarization of hadrons produced after hadronization, which could be measured via CP-violating weak decays of hyperons.
The STAR experiment observed non-zero $\Lambda$ global polarization. Large amount of new data provided opportunities to measure multistrange hyperon polarization. It could be important input for hydrodynamic studies of system.
It this talk, we will report results of $\Xi$ hyperon global polarization ($P_{\Xi^{-}+\overline\Xi^{+}}$) measurement for Au+Au collisions at $\sqrt{s_{NN}}$ = 27, 54.4 GeV and 200 GeV.

Presentation materials

Nucleus_2.pdf