在RHIC的PHENIX实验中使用新的$π^{0}$标记方法寻找来自$\sqrt{s_{NN}}=200GeV$ AuAu碰撞的直接光子
Search for Direct Photons from $\sqrt{s_{NN}}=200GeV$ AuAu Collisions Using a New $π^{0}$ Tagging Method in the PHENIX Experiment at RHIC
摘要：
直接光子为研究重离子碰撞的不同阶段，特别是夸克-胶子等离子体的形成提供了一个有洞察力的工具，而不受强相互作用和强子化过程的影响。直接光子的产额可以根据包含的光子产额和强子衰变的背景来确定。我们提出了一种新的分析技术应用于PHENIX Run4 Au+Au数据集。它在电磁量热计（EMCal）中使用严格的粒子识别（PID）和带电粒子否决来提取干净的光子信号。这些光子然后用具有松散PID切割的EMCal光子候选标记，其可以以高效率重建，以确定源自$π^{0}$衰变的光子的分数。这种方法消除了许多系统不确定性和探测器效应。
英文摘要：
Direct photons provide a insightful tool to study the different stages of a heavy ion collision, especially the formation of a quark-gluon plasma, without being influenced by the strong interaction and hadronization processes. The yield of direct photons can be determined based on the inclusive photon yield and the background from hadronic decays. We present a new analysis technique applied to PHENIX Run4 Au+Au dataset. It uses strict particle identification(PID) in the Electromagnetic Calorimeter(EMCal) and a charged particle veto to extract a clean photon signal. These photons are then tagged with EMCal photon candidates with loose PID cuts, which can be reconstructed with high efficiency, to determine the fraction of photons originating from $π^{0}$ decays. Many systematic uncertainties and detector effects cancel in this method.
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