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

Publication ,  Journal Article
Adam, J; Adamczyk, L; Adams, JR; Adkins, JK; Agakishiev, G; Aggarwal, MM; Ahammed, Z; Ajitanand, NN; Alekseev, I; Anderson, DM; Aoyama, R ...
Published in: Physical Review C
July 23, 2018
Published version (DOI)

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.

Duke Scholars

Anselm G. Vossen
Author Anselm G. Vossen Physics
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Published In

Physical Review C

DOI

10.1103/PhysRevC.98.014910

EISSN

2469-9993

ISSN

2469-9985

Publication Date

July 23, 2018

Volume

98

Issue

1

Related Subject Headings

  • 5106 Nuclear and plasma physics
 

Citation

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Adam, J., Adamczyk, L., Adams, J. R., Adkins, J. K., Agakishiev, G., Aggarwal, M. M., … Herrmann, N. (2018). Global polarization of Λ hyperons in Au + Au collisions at sNN =200 GeV. Physical Review C, 98(1). https://doi.org/10.1103/PhysRevC.98.014910
Adam, J., L. Adamczyk, J. R. Adams, J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, et al. “Global polarization of Λ hyperons in Au + Au collisions at sNN =200 GeV.” Physical Review C 98, no. 1 (July 23, 2018). https://doi.org/10.1103/PhysRevC.98.014910.
Adam J, Adamczyk L, Adams JR, Adkins JK, Agakishiev G, Aggarwal MM, et al. Global polarization of Λ hyperons in Au + Au collisions at sNN =200 GeV. Physical Review C. 2018 Jul 23;98(1).
Adam, J., et al. “Global polarization of Λ hyperons in Au + Au collisions at sNN =200 GeV.” Physical Review C, vol. 98, no. 1, July 2018. Scopus, doi:10.1103/PhysRevC.98.014910.
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, 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, Herrmann N. Global polarization of Λ hyperons in Au + Au collisions at sNN =200 GeV. Physical Review C. 2018 Jul 23;98(1).

Published In

Physical Review C

DOI

10.1103/PhysRevC.98.014910

EISSN

2469-9993

ISSN

2469-9985

Publication Date

July 23, 2018

Volume

98

Issue

1

Related Subject Headings

  • 5106 Nuclear and plasma physics