Global polarization of [lambda] hyperons in Au+Au collisions at √sNN=200 GeV
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 resul...
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| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
23 July 2018
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| In: |
Physical review
Year: 2019, Jahrgang: 99, Heft: 1 |
| ISSN: | 2469-9993 |
| DOI: | 10.1103/PhysRevC.98.014910 |
| Online-Zugang: | Verlag, Volltext: https://doi.org/10.1103/PhysRevC.98.014910 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevC.98.014910 
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| Verfasserangaben: | J. Adam, I.M. Deppner, N. Herrmann [und 346 weitere] (STAR Collaboration) |
MARC
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| 246 | 3 | 3 | |a Global polarization of lambda hyperons in Au + Au collisions at square root s NN = 200 GeV |
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| 520 | |a 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. | ||
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