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arXiv 2010.15134nucl-thhep-phnucl-ex
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用重离子计算框架Trajectum对重离子碰撞的贝叶斯分析

Bayesian analysis of heavy ion collisions with the heavy ion computational framework Trajectum

Govert Nijs, Wilke van der Schee, Umut Gürsoy, Raimond Snellings

摘要:

介绍了一个重离子碰撞模型Trajectum,它包括一个自由流速度可变的扩展初始阶段$v_{\rm fs}$和一个具有三个不同的二阶输运系数的流体动力学阶段.我们描述如何获得这个20参数模型的高斯仿真器,并显示关键观测结果。这个仿真器可以用来获得贝叶斯后验估计的参数,我们测试一个精心设计的封闭测试以及收敛性研究。最后,我们采用在[1]中找到的参数的最佳值来与PbPb和$p$ Pb碰撞的实验数据进行详细的比较。这既包括用来获得这些值的观测量,也包括更宽的横向动量范围和新的观测量,如事件平面角度的相关性。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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