论文标题
贝叶斯对重离子碰撞与重离子计算框架轨迹的分析
Bayesian analysis of heavy ion collisions with the heavy ion computational framework Trajectum
论文作者
论文摘要
我们引入了一个名为Truakeum的重离子碰撞模型，其中包括一个扩展的初始阶段，具有可变的自由流速度$ V _ {\ rm FS} $和一个具有三个不同二阶传输系数的流体动力阶段。我们描述了如何获得该20个参数模型的高斯模拟器，并显示了关键可观察物的结果。该模拟器可用于获得有关参数的贝叶斯后验估计值，我们通过精心的闭合测试以及收敛研究对其进行测试。最后，我们采用[1]中发现的参数的最佳值，以对PBPB和$ p $ pb碰撞的实验数据进行详细的比较。这两个都包括用于获得这些值的可观察物以及更宽的横向动量范围和新的可观察到事件平面角相关性。
We introduce a model for heavy ion collisions named Trajectum, which includes an expanded initial stage with a variable free streaming velocity $v_{\rm fs}$ and a hydrodynamic stage with three varying second order transport coefficients. We describe how to obtain a Gaussian Emulator for this 20-parameter model and show results for key observables. This emulator can be used to obtain Bayesian posterior estimates on the parameters, which we test by an elaborate closure test as well as a convergence study. Lastly, we employ the optimal values of the parameters found in [1] to perform a detailed comparison to experimental data from PbPb and $p$Pb collisions. This includes both observables that have been used to obtain these values as well as wider transverse momentum ranges and new observables such as correlations of event-plane angles.
