A study of Λ and ¯Λ polarization splitting by meson field in PICR hydrodynamic model
Journal article, Peer reviewed
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Original versionEuropean Physical Journal C. 2021, 81, 12. https://doi.org/10.1140/epjc/s10052-021-08828-z
With the PICR hydrodynamic model, we study the polarization splitting between Λ and Λ¯ at RHIC BES energy range, based on the meson field mechanism. Our results fit to the experimental data fairly well. Besides, two unexpected effect emerges: (1) the baryon density gradient has non-trivial and negative contribution to the polarization splitting; (2) for 7.7 GeV Au+Au collisions within the centrality range of 20–50%, the polarization splitting surprisingly increases with the centrality decreases. The second effect might help to explain the significant signal of polarization splitting measured in STAR’s Au+Au 7.7 Gev collisions.