Primordial fluctuations in heavy-ion collisions
Primordial fluctuations in heavy-ion collisions
复制标题
重离子碰撞中的原始波动
DOI：
10.1016/j.physletb.2019.135006
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
J. Ollitrault
中科院分区：
文献类型：
--
作者：
F. Gelis;G. Giacalone;Pablo Guerrero;C. Marquet;J. Ollitrault
我们对由高能 QCD 驱动的核-核碰撞中产生的能量密度分布进行了简单描述。能量密度被建模为局部电荷与光滑原子核之间基本碰撞的贡献总和。这些相互作用中的每一种都会产生一个尖峰能量密度源，在很远的距离处下降，例如$1/r^2$，对应于点电荷的二维库仑场。我们的模型再现了在彩色玻璃凝聚态有效理论框架下计算的能量密度场的一点和两点函数，具有领先的对数精度。我们将其应用于偏心率波动的描述。与其他现有的重离子碰撞初始条件模型不同，它允许我们同时重现椭圆流和三角形流的中心性依赖性。
We present a simple description of the energy density profile created in a nucleus-nucleus collision, motivated by high-energy QCD. The energy density is modeled as the sum of contributions coming from elementary collisions between localized charges and a smooth nucleus. Each of these interactions creates a sharply-peaked source of energy density falling off at large distances like $1/r^2$, corresponding to the two-dimensional Coulomb field of a point charge. Our model reproduces the one-point and two-point functions of the energy density field calculated in the framework of the color glass condensate effective theory, to leading logarithmic accuracy. We apply it to the description of eccentricity fluctuations. Unlike other existing models of initial conditions for heavy-ion collisions, it allows us to reproduce simultaneously the centrality dependence of elliptic and triangular flow.