Imaging-based likelihood analysis for the STCF DTOF detector
Imaging-based likelihood analysis for the STCF DTOF detector
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DOI：
10.1016/j.nima.2023.168090
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发表时间：
2023-01
期刊：
影响因子：
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通讯作者：
Binbin Qi;M. Shao;Jianbei Liu
中科院分区：
文献类型：
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作者：
Binbin Qi;M. Shao;Jianbei Liu
提出了一种基于内反射切伦科夫光（DTOF）检测的飞行时间探测器，用于中国超级Tau-Charm设施（STCF）的端帽粒子识别。本文通过结合探测器记录的每个光子的二维位置和到达时间测量，进行基于成像的似然分析，研究了探测器的粒子识别性能。提出了两种解析算法，一种是具有近似多重库仑散射效应的模式平滑处理，另一种是没有的，以快速获得给定入射带电粒子的光子撞击模式。利用成像似然，在p< 2.4 GeV/c的大部分相空间中，介子识别效率为bbb97 %，对应的介子误认率为2%。此外，在p< 0.5 GeV/c时，dof探测器可以提供良好的μ/π分离，弥补了μ介子探测器在低动量下的较差性能。
A time-of-flight detector based on detection of internally reflected Cherenkov light (DTOF), is proposed for the endcap particle identification at the Super Tau–Charm Facility (STCF) in China. In this paper, the particle identification performance of the detector is studied by performing an imaging-based likelihood analysis combining the 2D position and arrival time measurements of each photon recorded by the detector. Two analytical algorithms, one with a pattern-smoothing process approximating the multiple Coulomb scattering effect and the other without, are developed to rapidly obtain the hit pattern of photons for a given incident charged particle. Using the imaging-based likelihood, a pion identification efficiency of> 97%, with a corresponding kaon misidentification rate of 2%, is achieved in most of the phase space at p< 2.4 GeV/c. In addition, good μ/π separation can be provided by the DTOF detector at p< 0.5 GeV/c, compensating for the muon detector’s poor performance at low momenta.