Abstract
Recent experimental results on global polarization of hyperons and spin alignment of vector mesons in heavy-ion collisions are reviewed, especially in context of the energy dependence and particle species dependence. New results on local polarization along the beam direction at the LHC are discussed with previous measurements at RHIC. Future outlook of these measurements and possible future directions for better understanding of local vorticity field are briefly discussed.
Highlights
In non-central heavy-ion collisions, an initial orbital angular momentum carried by two colliding nuclei is partially converted to the spin angular momentum of particles produced in the collisions [1,2,3]
This phenomenon is called global polarization, i.e. produced particles are globally polarized along the direction of the initial orbital angular momentum which is perpendicular to reaction plane
While results on the average global polarization are well reproduced by theoretical models [8,9,10,11,12] in a wide range of collision energies, differential measurements and local polarization measurements [13,14,15] found discrepancies with models which still remain open questions
Summary
In non-central heavy-ion collisions, an initial orbital angular momentum carried by two colliding nuclei is partially converted to the spin angular momentum of particles produced in the collisions [1,2,3]. While results on the average global polarization are well reproduced by theoretical models [8,9,10,11,12] in a wide range of collision energies, differential measurements and local polarization measurements [13,14,15] found discrepancies with models which still remain open questions. In this proceedings, recent experimental updates on global and local polarization measurements of hyperons as well as spin alignment measurements of vector mesons are reviewed and their physics implications are discussed
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