A study of $$\varLambda $$ Λ and $$\bar{\varLambda }$$ Λ ¯ polarization splitting by meson field in PICR hydrodynamic model
Abstract With the PICR hydrodynamic model, we study the polarization splitting between $$\varLambda $$ Λ and $$\bar{\varLambda }$$ Λ ¯ 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 b...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2021-01-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-021-08828-z |
| Summary: | Abstract With the PICR hydrodynamic model, we study the polarization splitting between $$\varLambda $$ Λ and $$\bar{\varLambda }$$ Λ ¯ 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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| ISSN: | 1434-6044 1434-6052 |