论文标题
$λ$旋转两极分化在事件相对论重型离子碰撞中
$Λ$ spin polarization in event-by-event relativistic heavy-ion collisions
论文作者
论文摘要
我们提出了一项系统的研究，该研究使用事件（3+1）D相对论流体动力学，对$λ$ Hyperon的极化可观察到。量化了初始热点尺寸和QGP的特定剪切粘度对极化可观察物的影响。我们使用相同的流体动力背景检查了热剪切张量对极化观察物的两个配方的影响。通过事件模拟，我们对$λ$的纵向极化$ p^z $的傅立叶系数进行了预测。我们提出了$ p^z $的傅立叶系数之间的新相关性，并带有充电的强子各向异性流量系数，以进一步测试从流体速度梯度到超子极化的映射。最后，我们在$ \ sqrt {s_ \ mathrm {nn}} = 200 $ gev中使用au+au，ru+ru和o+o碰撞提出系统尺寸扫描。
We present a systematic study of $Λ$ hyperon's polarization observables using event-by-event (3+1)D relativistic hydrodynamics. The effects of initial hot spot size and QGP's specific shear viscosity on the polarization observables are quantified. We examine the effects of the two formulations of the thermal shear tensor on the polarization observables using the same hydrodynamic background. With event-by-event simulations, we make predictions for the Fourier coefficients of $Λ$'s longitudinal polarization $P^z$ with respect to the event planes of different orders of anisotropic flow. We propose new correlations among the Fourier coefficients of $P^z$ and charged hadron anisotropic flow coefficients to further test the mapping from fluid velocity gradients to hyperon's polarization. Finally, we present a system size scan with Au+Au, Ru+Ru, and O+O collisions at $\sqrt{s_\mathrm{NN}} = 200$ GeV to study the system size dependence of polarization observables at the Relativistic Heavy-ion Collider.
