论文标题
库珀·弗里（Cooper-Frye）与短期排斥
Cooper-Frye sampling with short-range repulsion
论文作者
论文摘要
这项工作结合了颗粒之间的短期排斥力的效果，使其成为库珀 - 弗里·强体采样程序。这是通过拒绝采样步骤来实现的，该步骤禁止任何一对颗粒在坐标空间中重叠，从而有效地建模了硬核排斥的效果。新程序（称为拳头采样器）基于包装热拳。它用于研究重型离子中心碰撞中（净）质子数分布在广泛碰撞能量范围内的（净）质子数分布的影响，并结合确切的全球保存巴里昂数量，电荷和陌生性。将结果与基于分析近似的早期计算进行了比较，从而量化了不同碰撞能量下后者的准确性。新方法比分析方法的另一个优点是，它提供了事件生成器提供的灵活性，从而使其直接扩展到其他可观察物。
This work incorporates the effect of short-range repulsion between particles into the Cooper-Frye hadron sampling procedure. This is achieved by means of a rejection sampling step, which prohibits any pair of particles from overlapping in the coordinate space, effectively modeling the effect of hard-core repulsion. The new procedure -- called the FIST sampler -- is based on the package Thermal-FIST. It is used here to study the effect of excluded volume on cumulants of the (net-)proton number distribution in central collisions of heavy ions in a broad collision energy range in conjunction with exact global conservation of baryon number, electric charge, and strangeness. The results are compared with earlier calculations based on analytical approximations, quantifying the accuracy of the latter at different collision energies. An additional advantage of the new method over the analytic approaches is that it offers the flexibility provided by event generators, making it straightforwardly extendable to other observables.
