Work

Measurements of global and local spin polarization of hyperons in Au+Au collisions at RHIC-STAR

Year: 2026

Type: article

Abstract: Vortical structure created in heavy ion collision leads to the polarization of hyperons phenomenon, which can be used as a probe to study the spin degree of freedom. RHIC Beam Energy Scan II program offers a good opportunity to study the hyperon polarization over the wide energy regime. In these proceedings, we report measurements of the global polarization of Λ, Λ̅, Ξ± and Ω± at √sNN = 7.7−27 GeV in Au+Au collisions from BES-II. The global hyperons polarization of all hyperons decrease as collision energy increases. Additionally, we report the second harmonics of local Λ, Λ̅ polarization and their difference at √sNN = 7.7−27 GeV, which can be used to probe the baryonic spin Hall effect. These measurements provide valuable insights into the spin dynamics within the QCD medium produced in heavy ion collisions.

Source: Springer Link (Chiba Institute of Technology)

DOI: 10.1051/epjconf/202636403001/pdf

Author: Tan Lu

Institutions: Chinese Academy of Sciences, Institute of Modern Physics, University of Chinese Academy of Sciences

Language: English

Topic: High-Energy Particle Collisions Research

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: National Key Research and Development Program of China

OpenAlex ID: W7155013176

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