论文标题
高能重离子碰撞中初始密度波动的模型比较
Model comparison for initial density fluctuations in high energy heavy ion collisions
论文作者
论文摘要
分析并比较了高能量重离子碰撞的流体动力学描述的四个模型。我们研究了来自PB-PB碰撞的初始横向能量密度曲线中的期望值和事件的波动。具体而言，引入了波动的傅立叶贝塞尔模式扩展，我们确定了扩展系数的期望值和两模式相关函数。将可分析溶解的独立点基模型与基于Glauber理论的初始状态模型和基于颜色玻璃冷凝物框架的两个模型进行了比较。我们发现，所有研究模型的大波长模式显示了中央碰撞的通用特性，并讨论可以在分析中了解初始条件的一般特性的程度。
Four models for the initial conditions of a fluid dynamic description of high energy heavy ion collisions are analysed and compared. We study expectation values and event-by-event fluctuations in the initial transverse energy density profiles from Pb-Pb collisions. Specifically, introducing a Fourier-Bessel mode expansion for fluctuations, we determine expectation values and two-mode correlation functions of the expansion coefficients. The analytically solveable independent point-sources model is compared to an initial state model based on Glauber theory and two models based on the Color Glass Condensate framework. We find that the large wavelength modes of all investigated models show universal properties for central collisions and also discuss to which extent general properties of initial conditions can be understood analytically.
