Hyperon polarization in Heavy-Ion Collisions and gravity-related anomaly

Abstract

We study the energy dependence of global polarization of $\Lambda$ hyperons in peripheral $Au-Au$ collisions. We combine the calculation of vorticity and strange chemical potential in the framework of kinetic Quark-Gluon String Model with the anomalous mechanism related to axial vortical effect. The earlier found effect of helicity separation implies the quadrupole structure of longitudinal vorticity. We pay special attention to the temperature dependent contribution related to gravitational anomaly and found that the preliminary RHIC data are compatible with its suppression discovered earlier in lattice calculations. The antihyperons polarization is excessing that of hyperons and the difference is more pronounced at smaller energies.

11 pages, 4 figures; new figures, discussion, references and acknowledgments added

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Cited by in corpus (43)

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• The ALICE experiment: a journey through QCD
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• Global and local polarization of $\Lambda$ hyperons in Au+Au collisions at 200 GeV from STAR
• Estimates of hyperon polarization in heavy-ion collisions at collision energies $\sqrt{s_{NN}}=$ 4--40 GeV
• Spin polarization dynamics in the Gubser-expanding background
• Azimuthal angle dependence of the longitudinal spin polarization in relativistic heavy ion collisions
• Global $\Lambda$ polarization in moderately relativistic nuclear collisions
• On axial current in rotating and accelerating medium
• Hyperon Polarization from the Vortical Fluid in Low Energy Nuclear Collisions
• Effects of rotation and acceleration in the axial current: density operator vs Wigner function
• Unruh effect for fermions from the Zubarev density operator
• Polarization phenomenon in heavy-ion collisions
• Correlation between global polarization, angular momentum and flow in heavy-ion collisions
• Relaxation time for quark spin and thermal vorticity alignment in heavy-ion collisions
• Vortex rings in fragmentation regions in heavy-ion collisions at $\sqrt{s_{NN}}=$ 39 GeV
• General relativity effects in precision spin experimental tests of fundamental symmetries
• Relaxation time for the alignment between the spin of a finite-mass quark/antiquark and the thermal vorticity in relativistic heavy-ion collisions
• Helical massive fermions under rotation
• Unruh effect universality: emergent conical geometry from density operator
• Vorticity and Particle Polarization in Relativistic Heavy-Ion Collisions
• Thermodynamics of accelerated fermion gas and instability at Unruh temperature
• Hyperon--anti-hyperon polarization asymmetry in relativistic heavy-ion collisions as an interplay between chiral and helical vortical effects
• Helicity and vorticity in heavy-ion collisions at NICA energies
• Hyperon polarization and its relation with directed flow in high-energy nuclear collisions
• Fermion propagator in a rotating environment
• 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
• Global polarization in heavy-ion collisions based on axial vortical effect
• Calculation of acceleration effects using the Zubarev density operator
• Charge asymmetry dependence of the elliptic flow splitting in relativistic heavy-ion collisions
• Evolution of global polarization in relativistic heavy-ion collisions within a perturbative approach
• Effective lagrangian for the macroscopic motion of fermionic matter
• Non-perturbative Suppression of Chiral Vortical Effect in Hot (s)QGP for Hyperons Spin Polarization in Heavy Ion Collisions
• Hyperon global polarization in heavy-ion collisions at NICA energies. Feed-down effects and the role of ${\Sigma }^0$ hyperons
• Production of twisted particles in heavy-ion collisions
• Investigate the $\Lambda$ and $\bar{\Lambda }$ polarization splitting effect with combined mechanisms
• On Ambiguity of Definition of Shear and Spin-Hall Contributions to $\Lambda$ Polarization in Heavy-Ion Collisions
• Spin Boltzmann equation for non-relativistic spin-1/2 fermions
• Examination of the possibility of ${\pi }^0$ condensation and magnetization in freely interpenetrating nuclei
• Non-perturbative suppression of Chiral Effects in hot QGP for $\Lambda /\bar{\Lambda }$-hyperons spin polarization in heavy-ion collisions