论文标题
重离子碰撞中平均横向动量与各向异性流量之间的相关性
Correlation between mean transverse momentum and anisotropic flow in heavy-ion collisions
论文作者
论文摘要
最近在Cern大型Hadron碰撞机的PB+PB碰撞中测量了$ \ langle p_t \ rangle $的平均横向动量，$ \ langle p_t \ rangle $，各向异性流量的幅度（$ v_n $）之间的相关性。我们证实了先前的观察结果，即逐个事件的流体动力学预测$ v_n $和$ \ langle p_t \ rangle $之间的相关性与数据中测得的相似。 We show that the magnitude of this correlation can be directly predicted from the initial condition of the hydrodynamic calculation, for $n=2,3$, if one replaces $v_n$ by the corresponding initial-state anisotropy, $\varepsilon_n$, and $\langle p_t\rangle$ by the total energy per unit rapidity of the fluid at the beginning of the hydrodynamic expansion.
The correlation between the mean transverse momentum of outgoing particles, $\langle p_t \rangle$, and the magnitude of anisotropic flow, $v_n$, has recently been measured in Pb+Pb collisions at the CERN Large Hadron Collider, as a function of the collision centrality. We confirm the previous observation that event-by-event hydrodynamics predicts a correlation between $v_n$ and $\langle p_t \rangle$ that is similar to that measured in data. We show that the magnitude of this correlation can be directly predicted from the initial condition of the hydrodynamic calculation, for $n=2,3$, if one replaces $v_n$ by the corresponding initial-state anisotropy, $\varepsilon_n$, and $\langle p_t\rangle$ by the total energy per unit rapidity of the fluid at the beginning of the hydrodynamic expansion.
