Abstract
We discuss the helicity polarization which can be locally induced from both vorticity and helicity charge in non-central heavy ion collisions. Helicity charge redistribution can be generated in viscous fluid and contributes to azimuthal asymmetry of the polarization along global angular momentum or beam momentum. We also discuss on detecting the initial net helicity charge from topological charge fluctuation or initial color longitudinal field by the helicity polarization correlation of two hyperons and the helicity alignment of vector mesons in central heavy ion collisions.
Highlights
The spin polarization effect has drawn much attention in relativistic heavy ion collisions recently
In order to distinguish such polarization with the longitudinal polarization along the beam momentum, we denote it as helicity polarization
Under such approximation and neglecting the dependence on Y for Sz, we note that the helicity polarization must be rapidity odd and vanish at Y 1⁄4 0, which is different from the longitudinal polarization
Summary
The spin polarization effect has drawn much attention in relativistic heavy ion collisions recently. Some relevant reviews on spin effects in relativistic heavy ion collisions are available in Refs. [44,45,46,47,48,49,50] Most of these works concentrate on the global or local polarization along the global angular momentum (transverse polarization) or beam momentum (longitudinal polarization) for hyperons or vector mesons. In order to distinguish such polarization with the longitudinal polarization along the beam momentum, we denote it as helicity polarization. Other earlier works associated with the helicity in heavy ion collisions can be found in Refs. Other earlier works associated with the helicity in heavy ion collisions can be found in Refs. [51,52,53,54,55]
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