Global Polarization of Ξ and Ω Hyperons in Au+Au Collisions at sNN=200 GeV
In: Physical Review Letters, Jg. 126 (2021-04-23), Heft 16
Online
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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 Ξ[over ¯]^{+} 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 Ξ[over ¯]^{+}, is measured to be ⟨P_{Ξ}⟩=0.47±0.10(stat)±0.23(syst)% for the collision centrality 20%-80%. The ⟨P_{Ξ}⟩ is found to be slightly larger than the inclusive Λ polarization and in reasonable agreement with a multiphase transport model. The ⟨P_{Ξ}⟩ is found to follow the centrality dependence of the vorticity predicted in the model, increasing toward more peripheral collisions. The global polarization of Ω, ⟨P_{Ω}⟩=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.
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Global Polarization of Ξ and Ω Hyperons in Au+Au Collisions at sNN=200 GeV
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Autor/in / Beteiligte Person: | Adam, J ; Adamczyk, L ; Adams, JR ; Adkins, JK ; Agakishiev, G ; Aggarwal, MM ; Ahammed, Z ; Alekseev, I ; Anderson, DM ; Aparin, A ; Aschenauer, EC ; Ashraf, MU ; Atetalla, FG ; Attri, A ; Averichev, GS ; Bairathi, V ; Barish, K ; Behera, A ; Bellwied, R ; Bhasin, A ; Bielcik, J ; Bielcikova, J ; Bland, LC ; Bordyuzhin, IG ; Brandenburg, JD ; Brandin, AV ; Butterworth, J ; Caines, H ; de la Barca Sánchez, M Calderón ; Cebra, D ; Chakaberia, I ; Chaloupka, P ; Chan, BK ; Chang, F-H ; Chang, Z ; Chankova-Bunzarova, N ; Chatterjee, A ; Chen, D ; Chen, J ; Chen, JH ; Chen, X ; Chen, Z ; Cheng, J ; Cherney, M ; Chevalier, M ; Choudhury, S ; Christie, W ; Chu, X ; Crawford, HJ ; Csanád, M ; Daugherity, M ; Dedovich, TG ; Deppner, IM ; Derevschikov, AA ; Didenko, L ; Dong, X ; Drachenberg, JL ; Dunlop, JC ; Edmonds, T ; Elsey, N ; Engelage, J ; Eppley, G ; Esumi, S ; Evdokimov, O ; Ewigleben, A ; Eyser, O ; Fatemi, R ; Fazio, S ; Federic, P ; Fedorisin, J ; Feng, CJ ; Feng, Y ; Filip, P ; Finch, E ; Fisyak, Y ; Francisco, A ; Fulek, L ; Gagliardi, CA ; Galatyuk, T ; Geurts, F ; Ghimire, N ; Gibson, A ; Gopal, K ; Gou, X ; Grosnick, D ; Guryn, W ; Hamad, AI ; Hamed, A ; Harabasz, S ; Harris, JW ; He, S ; He, W ; He, XH ; He, Y ; Heppelmann, S ; Herrmann, N ; Hoffman, E ; Holub, L ; Hong, Y |
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Zeitschrift: | Physical Review Letters, Jg. 126 (2021-04-23), Heft 16 |
Veröffentlichung: | eScholarship, University of California, 2021 |
Medientyp: | academicJournal |
Umfang: | 162301 |
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