论文标题
初始状态波动对平均横向动量的影响
Effects of initial state fluctuations on the mean transverse momentum
论文作者
论文摘要
我们表明，在重型离子碰撞的理想流体动力模拟中，初始状态波动会增加外向辐射的平均横向动量，即$ \ langle p_t \ rangle $。具体来说，如果实现现实的波动，则$ \ langle p_t \ rangle $比在平滑的初始条件下，多重性和撞击参数保持固定。我们表明，可以追溯到以下事实：对于给定的总熵，如果密度曲线颠倒，则流体中包含的初始能量更大。我们讨论了这些结果对从实验数据中提取QCD状态方程的意义。
We show that in ideal hydrodynamic simulations of heavy-ion collisions, initial state fluctuations result in an increase of the mean transverse momentum of outgoing hadrons, $\langle p_t\rangle$. Specifically, $\langle p_t\rangle$ is larger by a few percent if realistic fluctuations are implemented than with smooth initial conditions, the multiplicity and impact parameter being kept fixed. We show that result can be traced back to the fact that for a given total entropy, the initial energy contained in the fluid is larger if the density profile is bumpy. We discuss the implication of these results for the extraction of the equation of state of QCD from experimental data.
