A study of $\Lambda$ and $\bar{\Lambda}$ polarization splitting by meson field in PICR hydrodynamic model
High Energy Physics - Phenomenology
2021-01-27 v2 Nuclear Theory
Abstract
With the PICR hydrodynamic model, we study the polarization splitting between and 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.
Cite
@article{arxiv.1912.00209,
title = {A study of $\Lambda$ and $\bar{\Lambda}$ polarization splitting by meson field in PICR hydrodynamic model},
author = {Yilong Xie and Gang Chen and Laszlo Pal Csernai},
journal= {arXiv preprint arXiv:1912.00209},
year = {2021}
}