Magnetic Field Induced Polarization Difference between Hyperons and Anti-hyperons

Understand

Recent STAR measurements suggest a difference in the global spin polarization between hyperons and anti-hyperons, especially at relatively low collision beam energy.

• One possible cause of this difference is the potential presence of in-medium magnetic field.
• In this study, we investigate the phenomenological viability of this interpretation.
• Using the AMPT model framework, we quantify the influence of different magnetic field evolution scenarios on the size of the polarization difference in a wide span of collision beam energies.