https://doi.org/10.1140/epja/s10050-023-00997-7
Regular Article - Theoretical Physics
Investigate the 
and 
polarization splitting effect with combined mechanisms
School of Mathematics and Physics, China University of Geosciences (Wuhan), Lumo Road 388, 430074, Wuhan, China
Received:
26
February
2023
Accepted:
30
March
2023
Published online:
17
May
2023
The significant splitting of and polarization measured in STAR’s Au + Au 7.7GeV collisions seems to be huge and unable to be described satisfactorily by any single mechanism, thus we revisit and combine there different mechanisms together on the basis of our PICR hydrodynamic model, to explain the experimental data. The three mechanisms, i.e. the meson field mechanism, the freeze-out space-time mechanism, and the QGP’s magnetic field mechanism, lie on different stages of high energy collisions, and thus are not contradicted with each other. We find that the meson field mechanism is dominat, while the QGP’s magnetic field mechanism is rather trivial, and freeze-out time effect is restricted by the small FZ time difference, leading to a hierarchy of 
. Besides, the combination of different mechanisms could promote the mean value of polarization splitting from about 3%–4% to 4.5%, which is closer to the experimental measured mean value of 5.8%.
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