Global spin polarization of multistrange hyperons and feed-down effect in heavy-ion collisions
| Autor: | Li, Hui, Xia, Xiao-Liang, Huang, Xu-Guang, Huang, Huan Zhong |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Phys. Lett. B 827 (2022) 136971 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.physletb.2022.136971 |
| Popis: | Global spin polarization of hyperons is an important observable to probe the vorticity of the quark-gluon plasma produced in heavy-ion collisions. We calculate the global polarizations of $\Lambda$, $\Xi^-$, and $\Omega^-$ in Au+Au collisions at energies $\sqrt{s_\text{NN}}=$ 7.7--200 GeV based on a multiphase transport model. Our calculations suggest that their primary global polarizations fulfill $P_{\Omega^-}\simeq 5/3P_{\Xi^-}\simeq 5/3P_\Lambda$. We also estimate the feed-down effect of particle decay on the global polarization. With the feed-down effect taken into account, the global polarizations of $\Lambda$ and $\Xi^-$ are clearly separated, and the final global polarizations are in the ordering: $P_{\Omega^-}>P_{\Xi^-}>P_\Lambda$. Such a relation can be tested in experiments, which will provide us more information about the global polarization mechanism. Comment: 6 pages, 3 figures. v2: discussion added |
| Databáze: | arXiv |
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