https://doi.org/10.1140/epjc/s10052-021-08828-z
Regular Article – Theoretical Physics
A study of 
and 
polarization splitting by meson field in PICR hydrodynamic model
1
School of Mathematics and Physics, China University of Geosciences (Wuhan), Lumo Road 388, 430074, Wuhan, China
2
Department of Physics and Technology, University of Bergen, Allegaten 55, 5007, Bergen, Norway
3
Frankfurt Institute for Advanced Studies, Ruth-Moufang-Strasse 1, 60438, Frankfurt am Main, Germany
Received:
31
May
2020
Accepted:
1
January
2021
Published online:
11
January
2021
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.
© The Author(s) 2021
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