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Adamczyk, L; Ahammed, Z; Alekseev, I; Anderson, D M; Ashraf, M U; Atetalla, F G; Attri, A; Cebra, D; Chan, B K; Chatterjee, A; Chen, J H; Choudhury, S; Christie, W; Crawford, H J; Drachenberg, J L; Eppley, G; Esumi, S; Evdokimov, O; Ewigleben, A; Eyser, O; Fedorisin, J; Feng, C J; Filip, P; Fulek, L; Hamed, A; He, S; He, X H; Herrmann, N; Hoffman, E; Horvat, S; Hu, Y; Huang, T; Huo, P; Igo, G; Jacobs, W W; Kagamaster, S; Kincses, D; Kosarzewski, L K; Krueger, K; Mudiyanselage, N Kulathunga; Lauret, J; Lee, J H; Li, C; Li, W; Li, Y; Liu, H; Liu, Z; Longacre, R S; Lukow, N S; Ma, G L; Mazer, J A; Nasim, Md; Nie, M; Nigmatkulov, G; Niida, T; Nogach, L V; Pawlowska, D; Pokhrel, B R; Pruthi, N K; Qiu, H; Quintero, A; Ramachandran, S; Ray, R L; Rogachevskiy, O V; Romero, J L; Sandweiss, J; Schmitz, N; Schweid, B R; Seck, F; Shen, W Q; Sichtermann, E P; Sikora, R; Simko, M; Singh, J; Solyst, W; Srivastava, B; Sun, X; Surrow, B; Tang, A H; Taranenko, A; Thomas, J H; Tomkiel, C A; Tribble, R E; Tsai, O D; Upsal, I; Van Buren, G; Vanek, J; Wang, F; Wang, P; Westfall, G D; Wieman, H; Wissink, S W; Xu, H; Xu, N; Xu, Q H; Xu, Z; Yang, S; Ye, Z; Zhong, C; Zyzak, 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 √sNN = 200 GeV. The measurements of the Ξ− and ... 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 ... is measured to be ⟨PΞ⟩ = 0.47 ± 0.10(stat) ± 0.23(syst)% for the collision centrality 20%–80%. The ⟨PΞ⟩ is found to be slightly larger than the inclusive Λ polarization and in reasonable agreement with a multiphase transport model. The ⟨PΞ⟩ is found to follow the centrality dependence of the vorticity predicted in the model, increasing toward more peripheral collisions. The global polarization of Ω, ⟨PΩ⟩ = 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 CΩΛ = 1.
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