Global polarization in heavy-ion collisions based on axial vortical effect

Abstract

Global polarization of $\Lambda$ and $\bar{\Lambda }$ is calculated based on the axial vortical effect (AVE). Simulations are performed within the model of the three-fluid dynamics. Equations of state with the deconfinement transition result in a good agreement with STAR data for both $\Lambda$ and $\bar{\Lambda }$ polarization, in particular, with the $\Lambda$-$\bar{\Lambda }$ splitting. Suppression of the gravitational-anomaly contribution required for the data reproduction is in agreement with predictions of the QCD lattice simulations. Predictions for the global polarization in forthcoming experiments at lower collision energies are made. These forthcoming data will provide a critical test for the AVE and thermodynamic mechanisms of the polarization.

4 pages, 3 figures, discussion added, version published in PRC

References in corpus (10)

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• Searching for the Subatomic Swirls in the CuCu and CuAu Collisions

Cited by in corpus (12)

• Dissipative Spin Dynamics in Relativistic Matter
• Global $\Lambda$ polarization in moderately relativistic nuclear collisions
• Helicity and vorticity in heavy-ion collisions at NICA energies
• Anomalous gravitomagnetic moment and non-universality of the axial vortical effect at finite temperature
• Global $\Lambda$ polarization in heavy-ion collisions at energies 2.4--7.7 GeV: Effect of Meson-Field Interaction
• Chiral vortical effect for vector fields
• Hyperon global polarization in heavy-ion collisions at NICA energies. Feed-down effects and the role of ${\Sigma }^0$ hyperons
• $\Lambda$ and $\overline{\Lambda }$ Freeze-Out Distributions and Global Polarizations in Au+Au Collisions
• Investigate the $\Lambda$ and $\bar{\Lambda }$ polarization splitting effect with combined mechanisms
• Spin Effects In Heavy Ion Collisions at High Energies
• Hyperon Production in Bi+Bi Collisions at NICA and Angular Dependence of Hyperon Spin Polarization
• Spin Boltzmann equation for non-relativistic spin-1/2 fermions