标题： 簇时间测量与CEPC量能器 显示英文标题

标题： Cluster time measurement with CEPC calorimeter

摘要： 我们开发了一种专门用于高颗粒度量能器(HGC)时间重建的算法。 该算法的性能在与CMS端部量能器升级的电磁隔室(CE-E)几何结构相似的电磁量能器(ECAL)以及未来希格斯工厂概念性的粒子流导向ECAL上进行了评估。 单个通道的时间响应根据CMS实验结果进行参数化。 粒子飞行时间(ToF)的测量分辨率对于电磁(EM)簇射为$5\sim20 \;\rm{ps}$，对于1 GeV以上的强子簇射为$80\sim 160 \;\rm{ps}$。 所提出的算法提供的重建效果与$E_{\mathrm{hit}}^2$加权策略相当，并且相比对时间谱快速成分的简单平均，可以显著提高时间分辨率。 本研究还量化了三种探测器配置的影响。 ToF分辨率线性依赖于单个硅传感器的时间分辨率，并随着入射粒子能量的增加而统计改善。 深度为$6\sim 9$个辐射长度的时间层对EM簇射提供了更高的时间性能。 一种能够排除孤立脉冲的聚类算法可以提高ToF分辨率。 显示英文摘要

摘要： We have developed an algorithm dedicated to timing reconstruction in highly granular calorimeters(HGC). The performance of this algorithm is evaluated on an electromagnetic calorimeter (ECAL) with geometries comparable to the electromagnetic compartment (CE-E) of the CMS endcap calorimeter upgrade at HL-LHC and conceptual Particle Flow oriented ECAL's for future Higgs factories. The time response of individual channel is parameterized according to the CMS experimental result. The particle Time-of-Flight (ToF) can be measured with a resolution of $5\sim20 \;\rm{ps}$ for electromagnetic (EM) showers and $80\sim 160 \;\rm{ps}$ for hadronic showers above 1 GeV. The presented algorithm provides comparable reconstruction with the $E_{\mathrm{hit}}^2$ weighting strategy and can significantly improve the time resolution compared to a simple averaging of the fast component of the time spectrum. The effects of three detector configurations are also quantified in this study. ToF resolution depends linearly on the timing resolution of a single silicon sensor and improves statistically with increasing incident particle energy. The timing layers at depth of $6\sim 9$ radiation lengths provide higher timing performance for EM showers. A clustering algorithm that vetoes isolated hits improves ToF resolution.