We show that local parity violation due to chirality imbalance in relativistic nuclear collisions can be revealed by measuring the projection of the polarization vector onto the momentum, i.e. the helicity, of final state baryons. The proposed method does not require a coupling to the electromagnetic field, like in the Chiral Magnetic Effect. By using linear response theory, we show that, in the presence of a chiral imbalance, the spin 1/2 baryons and anti-baryons receive an additional contribution to the polarization along their momentum and proportional to the axial chemical potential. The additional, parity-breaking, contribution to helicity can be detected by studying helicity-helicity azimuthal angular correlation.

我们表明，可以通过测量极化矢量在最终态重子的动量（即螺旋度）上的投影来揭示由于相对论核碰撞中的手性不平衡导致的局部奇偶性违反。所提出的方法不需要耦合到电磁场，就像在手性磁效应中一样。通过使用线性响应理论，我们表明，在存在手性不平衡的情况下，自旋 1/2 重子和反重子沿着它们的动量接收额外的极化贡献，并与轴向化学势成正比。可以通过研究螺旋度-螺旋度方位角相关性来检测对螺旋度的额外的、破坏奇偶校验的贡献。