能量损失量化的另一个要素
One more ingredient for energy loss quantification
摘要：
本文介绍了RHIC研究重离子碰撞中直接$γ$ -带电强子方位角关联的最新结果。我们使用这些相关性，通过介质诱导的高p $_T$部分子碎裂的修改来研究介质的色电荷密度。在STAR实验中，在$\sqrt{s_{NN}}$ = 200 GeV的$Au+Au$碰撞和$p+p$碰撞中，测量了高横能（8 $<$ E $_T$ $<$ 16 GeV）的直接光子与横向动量（3 $<$ p $_T$ $<$ 6 GeV/c）的远离侧带电强子的方位角关联.在STAR Barrel电磁量热计簇射最大探测器中的横向簇射形状分析用于区分直接光子和来自高p $_T$ $π^{0}$衰变的光子。直接$γ$的每触发远离侧收益小于相同中心性类中的$π^{0}$触发。在目前的不确定性的反冲抑制中心$Au+Au$碰撞I $_{CP}$直接$γ$和$π^{0}$是相似的。
英文摘要：
The recent results at RHIC for direct $γ$-charged hadron azimuthal correlations in heavy-ion collisions are presented. We use these correlations to study the color charge density of the medium through the medium-induced modification of high-p$_T$ parton fragmentation. Azimuthal correlations of direct photons at high transverse energy (8 $<$ E$_T$ $<$ 16 GeV) with away-side charged hadrons of transverse momentum (3 $<$ p$_T$ $<$ 6 GeV/c) have been measured over a broad range of centrality for $Au+Au$ collisions and $p+p$ collisions at $\sqrt{s_{NN}}$ = 200 GeV in the STAR experiment. A transverse shower shape analysis in the STAR Barrel Electromagnetic Calorimeter Shower Maximum Detector is used to discriminate between the direct photons and photons from the decays of high-p$_T$ $π^{0}$. The per-trigger away-side yield of direct $γ$ is smaller than from $π^{0}$ triggers in the same centrality class. Within the current uncertainty the recoil suppression in central $Au+Au$ collisions I$_{CP}$ of direct $γ$ and $π^{0}$ are similar.
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