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(2021)
Global Λ-hyperon polarization in Au+Au collisions at √s
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Abstract
Global hyperon polarization, P¯¯¯¯H, in Au+Au collisions over a large range of collision energy, sNN−−−√, has recently been measured and successfully reproduced by hydrodynamic and transport models with intense fluid vorticity of the Quark-Gluon Plasma (QGP). While naïve extrapolation of data trends suggests a large P¯¯¯¯H as the collision energy is reduced, the behavior of P¯¯¯¯H at small sNN−−−√<7.7 GeV is unknown. Operating the STAR experiment in fixed-target mode, we have measured the polarization of Λ hyperons along the direction of global angular momentum in Au+Au collisions at sNN−−−√=3 GeV. The observation of substantial polarization of 4.91±0.81(stat.)±0.15(syst.)% in these collisions may require a reexamination of the viscosity of any fluid created in the collision, the thermalization timescale of rotational modes, and of hadronic mechanisms to produce global polarization.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Arxiv Publications. |
| ID Code: | 124536 |
| Deposited On: | 25 Nov 2021 11:46 |
| Last Modified: | 25 Nov 2021 11:46 |
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