200次GeV Au+Au碰撞中粒子发射重尾的THERMINATOR模拟和PHENIX图像
THERMINATOR simulations and PHENIX images of a heavy tail of particle emission in 200 GeV Au+Au collisions
摘要：
从热化介质中发射出的粒子之间的相关性携带着关于粒子发射源的时空范围和动力学的重要信息。在PHENIX上用成象技术测量了π介子发射源函数S（r），发现它含有一个重的（幂律）尾。这使我们假设，有一个次级π介子晕，围绕着核心系统，经历流体动力学演化。利用为研究相对论重离子碰撞而设计的蒙特卡罗事件发生器THERMINATOR模拟和研究了共振衰变对粒子发射源尾部的影响。它缺乏重散射的实现，正如我们从以前的强子重散射代码模拟中所了解到的那样，这是幂律尾部的一种可能解释。我们的研究还表明，没有一个单独的π介子源是造成尾的原因：共振衰减或再散射或这些效应的组合都可能是造成重尾的原因。
英文摘要：
Correlation between emitted particles from a thermalized medium carry important information about the space-time extent and the dynamics of the particle emitting source. Pion emission source functions S(r) have been measured in PHENIX using an imaging technique, and it has been found that it contains a heavy (power-law) tail. It leads us to the assumption that there is a halo of secondary pions, surrounding the core system that undergoes the hydrodynamical evolution. THERMINATOR, a Monte Carlo event generator designed for studies in relativistic heavy-ion collisions is used to model and investigate the influence of resonance decays on the tail of particle emission source. It lacks the implementation of rescattering, which, as we have learnt from previous Hadron Rescattering Code simulations, is a possible explanation of the power-law tail. Our studies also have shown that none of the pion sources alone are responsible for the tail: either the resonance decays or rescattering or a combination of these effects is a possible cause of the heavy tail.
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