喷流识别技术综述
A Short Review on Jet Identification
摘要：
喷流可以用来探测在相对论重离子对撞机（RHIC）的碰撞中产生的高能量密度物质的物理性质。在高$p_{T}$下强抑制的强子分布和双强子关联的测量已经为部分子能量损失提供了证据。然而，由于能量损失和碎片化的竞争，这些测量遭受众所周知的几何偏差。这些偏差可以避免，如果射流重建独立于其破碎的细节-淬火或未淬火。本文讨论了重离子碰撞的高多重数所要求的现代喷注重建算法（锥重组和顺序重组）及其相应的背景扣除技术。我们回顾了最近在RHIC进行的STAR实验中关于$\sqrt {s_{NN}}= 200$ GeV中心Au+Au碰撞中直接喷注重建的结果。
英文摘要：
Jets can be used to probe the physical properties of the high energy density matter created in collisions at the Relativistic Heavy Ion Collider (RHIC). Measurements of strong suppression of inclusive hadron distributions and di-hadron correlations at high $p_{T}$ have already provided evidence for partonic energy loss. However, these measurements suffer from well-known geometric biases due to the competition of energy loss and fragmentation. These biases can be avoided if the jets are reconstructed independently of their fragmentation details - quenched or unquenched. In this paper, we discuss modern jet reconstruction algorithms (cone and sequential recombination) and their corresponding background subtraction techniques required by the high multiplicities of heavy ion collisions. We review recent results from the STAR experiment at RHIC on direct jet reconstruction in central Au+Au collisions at $\sqrt {s_{NN}}= 200$ GeV.
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