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Agakishiev, G.; Aparin, A.; Aschenauer, E. C.; Bellwied, R.; Bhasin, A.; Bielcik, J.; Bland, L. C.; Bordyuzhin, I. G.; Brandin, A. V.; Chen, D.; Chen, J.; Chen, J. H.; Chevalier, M.; Choudhury, S.; Christie, W.; Chu, X.; Crawford, H. J.; Daugherity, M.; Drachenberg, J. L.; Dunlop, J. C.; Edmonds, T.; Engelage, J.; Feng, C. J.; Francisco, A.; Gagliardi, C. A.; Geurts, F.; Harabasz, S.; Harris, J. W.; He, S.; He, Y.; Heppelmann, S.; Hong, Y.; Huang, H. Z.; Huang, T.; Humanic, T. J.; Jacobs, W. W.; Ji, Y.; Kagamaster, S.; Ke, H. W.; Kelsey, M.; Khyzhniak, Y. V.; Kinghorn, T. A.; Kocan, M.; Kramarik, L.; Lan, S.; Lebedev, A.; Li, C.; Li, W.; Licenik, R.; Lin, Y.; Liu, F.; Liu, H.; Liu, Z.; Luo, S.; Luo, X.; Ma, G. L.; Mallick, D.; Markert, C.; Mohanty, B.; Nasim, Md; Neff, D.; Nelson, J. M.; Ogawa, A.; Oh, S.; Okorokov, V. A.; Panebratsev, Y.; Pawlowska, D.; Pei, H.; Pokhrel, B. R.; Porter, J.; Quintero, A.; Romero, J. L.; Rusnak, J.; Shanmuganathan, P. V.; Singha, S.; Smirnov, N.; Solyst, W.; Srivastava, B.; Stringfellow, B.; Svirida, D. N.; Taranenko, A.; Tarnowsky, T.; Thomas, J. H.; Tomkiel, C. A.; Tripathy, S. K.; Voloshin, S. A.; Wang, G.; Wang, J. S.; Webb, J. C.; Weidenkaff, P. C.; Westfall, G. D.; Witt, R.; Xu, H.; Xu, N.; Yang, Z.; Yip, K.; Zhang, D.; Zhang, Z. J.; Zhu, Z.; Zurek, M.
Physical review letters, 04/2021, Volume: 126, Issue: 16Journal Article
Global polarization of Ξ and Ω hyperons has been measured for the first time in Au+Au collisions at $\sqrt{s_{NN}}$=200 GeV. The measurements of the $Ξ^{-}$ and $\overline{Ξ}^{+}$ hyperon polarization have been performed by two independent methods, via analysis of the angular distribution of the daughter particles in the parity violating weak decay Ξ→Λ+π, as well as by measuring the polarization of the daughter Λ hyperon, polarized via polarization transfer from its parent. The polarization, obtained by combining the results from the two methods and averaged over $Ξ^{-}$ and $\overline{Ξ}^{+}$, is measured to be $\langle{P_{Ξ}}\rangle$=0.47±0.10(stat)±0.23(syst)% for the collision centrality 20%-80%. The $\langle{P_{Ξ}}\rangle$ is found to be slightly larger than the inclusive Λ polarization and in reasonable agreement with a multiphase transport model. The $\langle{P_{Ξ}}\rangle$ is found to follow the centrality dependence of the vorticity predicted in the model, increasing toward more peripheral collisions. Finally, the global polarization of Ω, $\langle{P_{Ω}}\rangle$=1.11±0.87(stat)±1.97(syst)% was obtained by measuring the polarization of daughter Λ in the decay Ω→Λ+K, assuming the polarization transfer factor $C_{ΩΛ}=1$.
