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Title: Global and local polarization of Lambda hyperons in Au+Au collisions at 200 GeV from STAR

Abstract

New results on global polarization of Lambda hyperons in Au+Au collisions at psNN = 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:
;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1501601
Report Number(s):
BNL-211378-2019-CPPJ
DOE Contract Number:  
SC0012704
Resource Type:
Conference
Resource Relation:
Conference: 27th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter), Venice, Italy, 5/14/2018 - 5/19/2018
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Niida, Takafumi, and Arkhipkin, Dmitry. Global and local polarization of Lambda hyperons in Au+Au collisions at 200 GeV from STAR. United States: N. p., 2018. Web.
Niida, Takafumi, & Arkhipkin, Dmitry. Global and local polarization of Lambda hyperons in Au+Au collisions at 200 GeV from STAR. United States.
Niida, Takafumi, and Arkhipkin, Dmitry. Mon . "Global and local polarization of Lambda hyperons in Au+Au collisions at 200 GeV from STAR". United States. https://www.osti.gov/servlets/purl/1501601.
@article{osti_1501601,
title = {Global and local polarization of Lambda hyperons in Au+Au collisions at 200 GeV from STAR},
author = {Niida, Takafumi and Arkhipkin, Dmitry},
abstractNote = {New results on global polarization of Lambda hyperons in Au+Au collisions at psNN = 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 = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {5}
}

Conference:
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