Journal Club: Experiment & Phenomenology-google meet
Global Lambda hyperon polarization in nuclear collisions: evidence for the most vortical fluid
Global Lambda hyperon polarization in nuclear collisions: evidence for the most vortical fluid
Ali Tabatabaee, IPM
8 MAR 2021
11:00 - 12:00
Based on
Nature \textbf{548} (2017), 62-65
&
arXiv:1701.06657
Abstract: In the non-central collisions of heavy ions, two colliding nuclei carry a large angular momentum. After the collision, part of this angular momentum remains in the interaction zone and results in a vortical structure in the fluid. The vorticity of the fluid produces novel phenomena that are related to the non-trivial structure of Quantum Chromodynamics vacuum. To study these new phenomena, It is necessary to observe the vorticity of the fluid. Recently the Star collaboration at RHIC reported the vortical structure in the plasma of quarks and gluons through the observation of the spin alignment of Lambda hyperons in the direction of initial angular momentum.
In this talk after giving a brief review of vorticity structure in the produced plasma, I will present some experimental results of the spin polarization of the produced particles reported by the Star collaboration at RHIC.
https://meet.google.com/cph-xgtg-wfw