Speaker
Description
The system created in relativistic nucleus-nucleus collisions may possess large orbital angular momentum leading to the global polarization of particles perpendicular to the reaction plane. The local asymmetries in the velocity fields due to anisotropic flow can also generate vorticity and particle polarization along the beam direction. In parity-violating weak decays of hyperons, the momentum direction of the decay baryon is correlated with the hyperon spin and can be used to measure the hyperon polarization and thus estimate the local and global vorticity of the system created in relativistic heavy-ion collisions.
In this talk, the recent experimental measurements of the local and global polarization of the lambda and anti-lambda hyperons in Pb-Pb collisions in ALICE will be presented. Also, a comparison of the ALICE results with the previous STAR measurements will be shown and the collision energy dependence of the local and global hyperon polarization will be discussed.
| Collaboration | ALICE |
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