标题： 研究高能核碰撞中的QCD动力学熵 显示英文标题

标题： Investigating QCD Dynamical Entropy in high-energy nuclear collisions

摘要： 在本工作中，QCD动力熵的概念被扩展到重离子系统中。 这种熵的概念可以理解为相对熵，并且还可以用来估计超高能重离子碰撞中的初始熵密度。 用于计算此熵的关键量是核非积分胶子分布（nUGD），它提供了一个横向动量概率密度。 在数值分析中，几何标度现象和Glauber-Gribov方法都被用来评估nUGD的现实模型。 结果表明，归一化过程和几何标度特性使得动力熵几乎与原子核质量数$A$无关。 给出了动力熵密度，$dS_D/dy$，关于快度的结果。 显示英文摘要

摘要： In this work, the concept of QCD dynamical entropy is extended to heavy ion systems. This notion of entropy can be understood as a relative entropy and can also be used to estimate the initial entropy density in ultra-relativistic heavy ion collisions. The key quantity used to calculate this entropy is the nuclear unintegrated gluon distribution (nUGD), which provides a transverse momentum probability density. In the numerical analysis, both the geometric scaling phenomenon and the Glauber-Gribov approach have been used to evaluate realistic models for the nUGD. It is shown that the normalization procedure and the geometric scaling property make the dynamical entropy almost independent of the nucleus mass number $A$. Results are presented for the dynamical entropy density, $dS_D/dy$, in terms of the rapidity.