The European Physical Journal C ( IF 4.2 ) Pub Date : 2021-01-11 , DOI: 10.1140/epjc/s10052-021-08828-z Yilong Xie , Gang Chen , Laszlo Pal Csernai
With the PICR hydrodynamic model, we study the polarization splitting between \(\varLambda \) and \(\bar{\varLambda }\) at RHIC BES energy range, based on the meson field mechanism. Our results fit to the experimental data fairly well. Besides, two unexpected effect emerges: (1) the baryon density gradient has non-trivial and negative contribution to the polarization splitting; (2) for 7.7 GeV Au+Au collisions within the centrality range of 20–50%, the polarization splitting surprisingly increases with the centrality decreases. The second effect might help to explain the significant signal of polarization splitting measured in STAR’s Au+Au 7.7 Gev collisions.
中文翻译:
PICR水动力模型中基于介子场的$$ \ varLambda $$Λ和$$ \ bar {\ varLambda} $$Λ极化分裂的研究
利用PICR水动力模型,我们基于介子场机制研究了RHIC BES能量范围内\(\ varLambda \)和\(\ bar {\ varLambda} \)之间的极化分裂。我们的结果非常符合实验数据。此外,还出现了两个意想不到的影响:(1)重子密度梯度对偏振分裂具有不平凡的负面影响;(2)在中心度20–50%范围内发生7.7 GeV Au + Au碰撞时,极化分裂随着中心度的降低而令人惊讶地增加。第二个效果可能有助于解释在STAR的Au + Au 7.7 Gev碰撞中测得的偏振分裂的重要信号。