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

Understand

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.