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arXiv 1912.08271nucl-th
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重离子碰撞流体动力学模拟中的粒子化:iS3D模块

Particlization in fluid dynamical simulations of heavy-ion collisions: The iS3D module

Mike McNelis, Derek Everett, Ulrich Heinz

摘要:

iS 3D粒子化模块通过库珀-弗莱公式的蒙特卡罗采样模拟了重离子碰撞中强子的发射,该公式将流体动力学信息转换为强子的局部相空间分布。该代码包包括多种选择的非平衡校正这些分布函数:14矩近似,一阶查普曼-Enskog展开,和两种类型的修改平衡分布。这使得有可能探索重离子实验数据在多大程度上对$δf_n$的不同选择敏感,而$δf_n$目前是粒子化阶段理论不确定性的主要来源。我们验证我们的粒子采样器具有很高的精度,产生几百万强子发射事件从纵向助推不变的超曲面和比较事件平均粒子谱和时空分布的库珀-弗莱公式。

英文摘要:

The iS3D particlization module simulates the emission of hadrons from heavy-ion collisions via Monte-Carlo sampling of the Cooper-Frye formula which converts fluid dynamical information into local phase-space distributions for hadrons. The code package includes multiple choices for the non-equilibrium correction to these distribution functions: the 14-moment approximation, first-order Chapman-Enskog expansion, and two types of modified equilibrium distributions. This makes it possible to explore to what extent heavy-ion experimental data are sensitive to different choices for $δf_n$, presently the main source of theoretical uncertainty in the particlization stage. We validate our particle sampler with a high degree of precision by generating several million hadron emission events from a longitudinally boost-invariant hypersurface and comparing the event-averaged particle spectra and space-time distributions to the Cooper-Frye formula.

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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