Global polarization of Lambda hyperons in Au+Au collisions at sqrt{s_NN} = 200 
GeV

STAR Collaboration,; Adam, J.; Schmitz, N.; Seyboth, P.; et al.,

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Global polarization of Lambda hyperons in Au+Au collisions at sqrt{s_NN} = 200 GeV

STAR Collaboration, Adam, J., Schmitz, N., Seyboth, P., & et al. (2018). Global polarization of Lambda hyperons in Au+Au collisions at sqrt{s_NN} = 200 GeV. Physical Review C, (98), 014910. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2018-320.

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Datensatz-Permalink: https://hdl.handle.net/21.11116/0000-0003-F90B-9 Versions-Permalink: https://hdl.handle.net/21.11116/0000-0003-F90C-8

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Urheber:
STAR Collaboration¹, Autor
Adam, J.¹, Autor
Schmitz, N.¹, Autor
Seyboth, P.¹, Autor
et al.¹, Autor

Affiliations:
1Max Planck Institute for Physics, Max Planck Society and Cooperation Partners, ou_2253650

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Schlagwörter: STAR

Zusammenfassung: Global polarization of $Λ$ hyperons has been measured to be of the order of a few tenths of a percent in Au+Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV, with no significant difference between $Λ$ and $\barΛ$. These new results reveal the collision energy dependence of the global polarization together with the results previously observed at $\sqrt{s_{_{NN}}}$ = 7.7 -- 62.4 GeV and indicate noticeable vorticity of the medium created in non-central heavy-ion collisions at the highest RHIC collision energy. The signal is in rough quantitative agreement with the theoretical predictions from a hydrodynamic model and from the AMPT (A Multi-Phase Transport) model. The polarization is larger in more peripheral collisions, and depends weakly on the hyperon's transverse momentum and pseudorapidity $η^H$ within $|η^H|<1$. 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.