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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