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

Adam, Jaroslav
ed.: STAR Collaboration (2018)
Global polarization of Λ hyperons in Au+Au collisions at √sNN = 200 GeV.
In: Physical Review C, 98 (1)
doi: 10.1103/PhysRevC.98.014910
Article, Bibliographie

Abstract

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.

Item Type: Article
Erschienen: 2018
Creators: Adam, Jaroslav
Type of entry: Bibliographie
Title: Global polarization of Λ hyperons in Au+Au collisions at √sNN = 200 GeV
Language: English
Date: 23 July 2018
Publisher: APS
Journal or Publication Title: Physical Review C
Volume of the journal: 98
Issue Number: 1
DOI: 10.1103/PhysRevC.98.014910
Abstract:

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.

Additional Information:

Art.No.: 014910

Divisions: 05 Department of Physics
05 Department of Physics > Institute of Nuclear Physics
05 Department of Physics > Institute of Nuclear Physics > Experimentelle Kernphysik
05 Department of Physics > Institute of Nuclear Physics > Experimentelle Kernphysik > Untersuchung von Quark-Materie mit virtuellen Photonen
Date Deposited: 09 Nov 2023 09:44
Last Modified: 06 Dec 2023 11:06
PPN: 513694293
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