Abstract

We review studies of vortical motion and the resulting global polarization of \(\Lambda\) and \(\bar{\Lambda}\) hyperons in heavy-ion collisions, in particular, within 3FD model. 3FD predictions for the global midrapidity polarization in the FAIR-NICA energy range are presented. The 3FD simulations indicate that energy dependence of the observed global polarization of hyperons in the midrapidity region is a consequence of the decrease of the vorticity in the central region with the collision energy rise because of pushing out the vorticity field into the fragmentation regions. At high collision energies this pushing-out results in a peculiar vortical structure consisting of two vortex rings: one ring in the target fragmentation region and another one in the projectile fragmentation region with matter rotation being opposite in these two rings.

中文翻译：

---

相对论重离子碰撞中的涡度和粒子极化

摘要

我们回顾了涡旋运动以及\（\ Lambda \）和\（\ bar {\ Lambda} \）的整体极化的研究重离子碰撞中的超子，特别是在3FD模型中。提出了3FD对FAIR-NICA能量范围内的全球中速极化的预测。3FD模拟表明，在中速区域中观测到的超子的整体极化的能量依赖性是由于将涡度场推向破碎区域，中心区域的涡度随着碰撞能量的升高而降低的结果。在高碰撞能量下，这种推出会形成一个特殊的涡旋结构，该结构由两个涡流环组成：一个在目标破碎区域的环，另一个在射弹破碎区域的环，物质的旋转在这两个环中是相反的。