论文标题
重型离子碰撞中全球极化，角动量和流动之间的相关性
Correlation between global polarization, angular momentum and flow in heavy-ion collisions
论文作者
论文摘要
根据全局极化的精制估计，研究了$λ$超子与角动量和横向流的可能相关性。在Collision Energies $ \ sqrt {s_ {nn}} = $ 6-40 GEV的Au+Au碰撞模拟中，在三流体动力学的模型中执行。在跨界和一阶转换场景中，这精制的估计值非常令人满意地再现了实验性星数据。 HADRONIC场景在高碰撞能量上失败，$ \ sqrt {s_ {nn}}> $ 10 GEV，甚至预测全局极化的相反符号。发现全局极化与中央区域中积累的角动量既不与定向和椭圆流相关。同时，我们观察到角动量和碰撞 - 能量依赖性的角动量和定向流之间的相关性。这些结果表明，尽管最初角动量是涡旋生成的驱动力，但后来在中间率区域中角动量和涡流运动变得不相关。然后，斑点角动量由定向流的模式确定，甚至在发生防卵时变为负。在冻结阶段，参与者角动量的主要部分积累在碎片区域中。
Possible correlations of the global polarization of $Λ$ hyperons with the angular momentum and transverse flow in the central region of colliding nuclei are studied based on refined estimate of the global polarization. Simulations of Au+Au collisions at collision energies $\sqrt{s_{NN}}=$ 6-40 GeV are performed within the model of the three-fluid dynamics. Within the crossover and first-order-phase-transition scenarios this refined estimate quite satisfactorily reproduces the experimental STAR data. Hadronic scenario fails at high collision energies, $\sqrt{s_{NN}}>$ 10 GeV, and even predicts opposite sign of the global polarization. It is found that the global polarization correlates with neither the angular momentum accumulated in the central region nor with directed and elliptic flow. At the same time we observed correlation between the angular momentum and directed flow in both their time and collision-energy dependence. These results suggest that, although initially the angular momentum is the driving force for the vortex generation, later the angular momentum and vortex motion become decorrelated in the midrapidity region. Then the midrapidity angular momentum is determined by the pattern of the directed flow and even becomes negative when the antiflow occurs. At the freeze-out stage, the dominant part of the participant angular momentum is accumulated in the fragmentation regions.
