Global and local polarization of Λ hyperons in Au+Au collisions at 200 GeV from STAR
Abstract
New results on global polarization of Λ hyperons in Au+Au collisions at √sNN = 200 GeV reveal non-zero signal on the order of a few tenths of a percent. Compared with lower energy results, the current measurement shows that the polarization decreases at higher collision energy, the trend being well reproduced by theoretical calculations. The polarization is found to be larger in more peripheral collisions, as well as in the in-plane than in the out-of-plane direction. The signal seems to depend on the asymmetry between positive and negative charge in each event, which may indicate an influence of the axial current induced by the magnetic field. In addition, the first measurement of a local polarization along the beam direction was performed. The results show a quadrupole modulation relative to the second-order event plane, as expected from the elliptic flow.
- Authors:
-
- Wayne State Univ., Detroit, MI (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- Contributing Org.:
- STAR Collaboration
- OSTI Identifier:
- 1580368
- Grant/Contract Number:
- AC02-05CH11231; FG02-92ER40713
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Physics. A
- Additional Journal Information:
- Journal Volume: 982; Journal Issue: C; Journal ID: ISSN 0375-9474
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Citation Formats
Niida, Takafumi. Global and local polarization of Λ hyperons in Au+Au collisions at 200 GeV from STAR. United States: N. p., 2019.
Web. doi:10.1016/j.nuclphysa.2018.08.034.
Niida, Takafumi. Global and local polarization of Λ hyperons in Au+Au collisions at 200 GeV from STAR. United States. https://doi.org/10.1016/j.nuclphysa.2018.08.034
Niida, Takafumi. Tue .
"Global and local polarization of Λ hyperons in Au+Au collisions at 200 GeV from STAR". United States. https://doi.org/10.1016/j.nuclphysa.2018.08.034. https://www.osti.gov/servlets/purl/1580368.
@article{osti_1580368,
title = {Global and local polarization of Λ hyperons in Au+Au collisions at 200 GeV from STAR},
author = {Niida, Takafumi},
abstractNote = {New results on global polarization of Λ hyperons in Au+Au collisions at √sNN = 200 GeV reveal non-zero signal on the order of a few tenths of a percent. Compared with lower energy results, the current measurement shows that the polarization decreases at higher collision energy, the trend being well reproduced by theoretical calculations. The polarization is found to be larger in more peripheral collisions, as well as in the in-plane than in the out-of-plane direction. The signal seems to depend on the asymmetry between positive and negative charge in each event, which may indicate an influence of the axial current induced by the magnetic field. In addition, the first measurement of a local polarization along the beam direction was performed. The results show a quadrupole modulation relative to the second-order event plane, as expected from the elliptic flow.},
doi = {10.1016/j.nuclphysa.2018.08.034},
journal = {Nuclear Physics. A},
number = C,
volume = 982,
place = {United States},
year = {Tue Jan 22 00:00:00 EST 2019},
month = {Tue Jan 22 00:00:00 EST 2019}
}
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Works referencing / citing this record:
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journal, November 2019
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- Physical Review D, Vol. 100, Issue 9
A microscopic description for polarization in particle scatterings
text, January 2019
- Zhang, Jun-jie; Fang, Ren-hong; Wang, Qun
- arXiv
Feed-down effect on $Λ$ spin polarization
text, January 2019
- Xia, Xiao-Liang; Li, Hui; Huang, Xu-Guang
- arXiv
Rotation induced charged pion condensation in a strong magnetic field: A Nambu--Jona-Lasino model study
text, January 2019
- Cao, Gaoqing; He, Lianyi
- arXiv