Global polarization of Λ hyperons in Au + Au collisions at sNN =200 GeV
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Pre-printDate
2018-07-23Author
Adam, JAdamczyk, L
Adams, JR
Adkins, JK
Agakishiev, G
Aggarwal, MM
Ahammed, Z
Ajitanand, NN
Alekseev, I
Anderson, DM
Aoyama, R
Aparin, A
Arkhipkin, D
Aschenauer, EC
Ashraf, MU
Atetalla, F
Attri, A
Averichev, GS
Bai, X
Bairathi, V
Barish, K
Bassill, AJ
Behera, A
Bellwied, R
Bhasin, A
Bhati, AK
Bielcik, J
Bielcikova, J
Bland, LC
Bordyuzhin, IG
Brandenburg, JD
Brandin, AV
Brown, D
Bryslawskyj, J
Bunzarov, I
Butterworth, J
Caines, H
Calderón De La Barca Sánchez, M
Campbell, JM
Cebra, D
Chakaberia, I
Chaloupka, P
Chang, FH
Chang, Z
Chankova-Bunzarova, N
Chatterjee, A
Chattopadhyay, S
Chen, JH
Chen, X
Chen, X
Cheng, J
Cherney, M
Christie, W
Contin, G
Crawford, HJ
Das, S
Dedovich, TG
Deppner, IM
Derevschikov, AA
Didenko, L
Dilks, C
Dong, X
Drachenberg, JL
Dunlop, JC
Efimov, LG
Elsey, N
Engelage, J
Eppley, G
Esha, R
Esumi, S
Evdokimov, O
Ewigleben, J
Eyser, O
Fatemi, R
Fazio, S
Federic, P
Federicova, P
Fedorisin, J
Filip, P
Finch, E
Fisyak, Y
Flores, CE
Fulek, L
Gagliardi, CA
Galatyuk, T
Geurts, F
Gibson, A
Grosnick, D
Gunarathne, DS
Guo, Y
Gupta, A
Guryn, W
Hamad, AI
Hamed, A
Harlenderova, A
Harris, JW
He, L
Heppelmann, S
Heppelmann, S
Herrmann, N
Permanent link to this record
http://hdl.handle.net/20.500.12613/4423
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10.1103/PhysRevC.98.014910Abstract
© 2018 American Physical Society. Global polarization of Λ hyperons has been measured to be of the order of a few tenths of a percentage in Au+Au collisions at sNN = 200 GeV, with no significant difference between Λ and Λ. These new results reveal the collision energy dependence of the global polarization together with the results previously observed at sNN = 7.7-62.4 GeV and indicate noticeable vorticity of the medium created in noncentral heavy-ion collisions at the highest Relativistic Heavy Ion Collider collision energy. The signal is in rough quantitative agreement with the theoretical predictions from a hydrodynamic model and from a multi-phase transport model. The polarization is larger in more peripheral collisions, and depends weakly on the hyperon's transverse momentum and pseudorapidity ηH within |ηH|<1. An indication of the polarization dependence on the event-by-event charge asymmetry is observed at the 2σ level, suggesting a possible contribution to the polarization from the axial current induced by the initial magnetic field.Citation to related work
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http://dx.doi.org/10.34944/dspace/4405