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arXiv · 1912.00209

A study of $Λ$ and $\barΛ$ polarization splitting by meson field in PICR hydrodynamic model

Yilong Xie·Gang Chen·Laszlo Pal Csernai
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Abstract

With the PICR hydrodynamic model, we study the polarization splitting between $Λ$ and $\barΛ$ 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.

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Yilong Xie, Gang Chen, Laszlo Pal Csernai. 2021-01-03. A study of $Λ$ and $\barΛ$ polarization splitting by meson field in PICR hydrodynamic model. https://doi.org/10.1140/epjc%2Fs10052-021-08828-z

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