"Figure 4" of "Hyperon polarization along the beam direction relative to the second and third harmonic event planes in isobar collisions at $\sqrt{s_{NN}}$ = 200 GeV"

The polarization of $\Lambda$ and $\bar{\Lambda}$ hyperons along the beam direction has been measured relative to the second and third harmonic event planes in isobar Ru+Ru and Zr+Zr collisions at $\sqrt{s_{NN}}$ = 200 GeV. The second harmonic results follow the emission angle dependence as expected due to elliptic flow, similar to that observed in Au+Au collisions. The polarization relative to the third harmonic event plane, measured for the first time, deviates from zero with 4.8$\sigma$ significance in 20-60\% centrality for $1.1

在核子-核子质心系能量√sNN=200 GeV的同量异位素钌-钌（Ru+Ru）与锆-锆（Zr+Zr）碰撞实验中，研究人员测量了沿束流方向的Λ超子（Lambda hyperon）与反Λ超子（anti-Lambda hyperon）相对于二次谐波事件平面（second harmonic event plane）与三次谐波事件平面（third harmonic event plane）的极化度。二次谐波的测量结果遵循椭圆流（elliptic flow）预期的发射角依赖关系，与金-金（Au+Au）碰撞中观测到的现象一致。本次首次测量的相对于三次谐波事件平面的极化度，在中心度20%-60%区间、针对1.1（原文未完整标注相关物理参数）的样本中偏离零值，统计显著性达4.8σ。