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    Global polarization of Λ hyperons in Au + Au collisions at sNN =200 GeV

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    1805.04400v2.pdf
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    Genre
    Pre-print
    Date
    2018-07-23
    Author
    Adam, J
    Adamczyk, 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
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    Subject
    nucl-ex
    nucl-ex
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/4423
    
    Metadata
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    DOI
    10.1103/PhysRevC.98.014910
    Abstract
    © 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
    American Physical Society (APS)
    Has part
    Physical Review C
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    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.34944/dspace/4405
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