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Investigate the \({\varLambda }\) and \({\bar{{\varLambda }}}\) polarization splitting effect with combined mechanisms

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Abstract

The significant splitting of \({\varLambda }\) and \({\bar{{\varLambda }}}\) 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 \({\varDelta } P_J \gg {\varDelta } P_t \gg {\varDelta } P_m\). 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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Data Availability

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: The data used to support the findings of this study are available from the corresponding author upon request.]

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Acknowledgements

The work of of Y. L. Xie is supported by National Natural Science Foundation of China (No. 12005196).

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Authors and Affiliations

  1. School of Mathematics and Physics, China University of Geosciences (Wuhan), Lumo Road 388, Wuhan, 430074, China

    Simin Wu & Yilong Xie

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  1. Simin Wu
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  2. Yilong Xie
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Correspondence to Yilong Xie.

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Communicated by Laura Tolos.

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Wu, S., Xie, Y. Investigate the \({\varLambda }\) and \({\bar{{\varLambda }}}\) polarization splitting effect with combined mechanisms. Eur. Phys. J. A 59, 108 (2023). https://doi.org/10.1140/epja/s10050-023-00997-7

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