论文标题
CSI（TL）脉冲形状与Belle II电磁热量表作为一种新方法，以改善电子峰壳壳的颗粒鉴定方法
CsI(Tl) Pulse Shape Discrimination with the Belle II Electromagnetic Calorimeter as a Novel Method to Improve Particle Identification at Electron-Positron Colliders
论文作者
论文摘要
本文介绍了Belle II电磁热量计的CSI（TL）脉冲形状辨别力的实现和性能，代表了CSI（TL）脉冲形状辨别剂在电子峰值撞机上识别粒子识别的首次应用。描述了Belle II量热仪应用的脉冲形状表征算法。 $γ$，$μ^+$，$π^\ pm $，$ k^\ pm $和$ p/\ bar {p} $的控制样品用于证明对CSI（TL）脉冲形状歧视的热量粒子组成的重要见解。提出了与模拟的比较，并为新开发的CSI（TL）闪烁响应模拟技术提供了进一步的验证，当与Geant4模拟合并时，允许对CSI（TL）的粒子依赖性闪烁响应进行建模。数据与仿真之间的比较还表明，脉冲形状歧视可能是识别材料中强烈互动仿真的改进来源的新工具。 $ k_l^0 $效率和光子效率和光子型伪造的伪造率是经过训练以使用脉冲形状歧视的训练，并与基于淋浴的方法进行了比较。 CSI（TL）脉冲形状歧视显示可在0.2 GEV的光子能量中降低超过3倍的光子假速率，而在1 GEV的光子能量下，在一个因子10上将其降低了。
This paper describes the implementation and performance of CsI(Tl) pulse shape discrimination for the Belle II electromagnetic calorimeter, representing the first application of CsI(Tl) pulse shape discrimination for particle identification at an electron-positron collider. The pulse shape characterization algorithms applied by the Belle II calorimeter are described. Control samples of $γ$, $μ^+$, $π^\pm$, $K^\pm$ and $p/\bar{p}$ are used to demonstrate the significant insight into the secondary particle composition of calorimeter clusters that is provided by CsI(Tl) pulse shape discrimination. Comparisons with simulation are presented and provide further validation for newly developed CsI(Tl) scintillation response simulation techniques, which when incorporated with GEANT4 simulations allow the particle dependent scintillation response of CsI(Tl) to be modelled. Comparisons between data and simulation also demonstrate that pulse shape discrimination can be a new tool to identify sources of improvement in the simulation of hadronic interactions in materials. The $K_L^0$ efficiency and photon-as-hadron fake-rate of a multivariate classifier that is trained to use pulse shape discrimination is presented and comparisons are made to a shower-shape based approach. CsI(Tl) pulse shape discrimination is shown to reduce the photon-as-hadron fake-rate by over a factor of 3 at photon energies of 0.2 GeV and over a factor 10 at photon energies of 1 GeV.
