Operation and Performance of Belle II Aerogel RICH Counter
Operation and Performance of Belle II Aerogel RICH Counter
复制标题
Belle II 气凝胶 RICH 计数器的操作和性能
DOI：
10.1088/1742-6596/2374/1/012001
复制
发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Shohei Nishida
中科院分区：
文献类型：
--
作者：
Shohei Nishida
SuperKEKB的贝儿II实验旨在收集比其前身贝儿多50倍的数据。实验的关键部分之一是粒子识别，特别是K介子和π介子的分离。在贝儿II光谱仪中，使用气凝胶作为辐射器（ARICH）的近贴聚焦环成像切伦科夫探测器配备的PID在前向端盖。在该计数器中，总共420个具有144个通道的混合雪崩光电探测器（HAPD）被用作在1.5T磁场内工作的位置敏感光子探测器。贝儿二号从2019年开始使用全探测器进行物理运行。我们报告ARICH的操作，包括死通道的比例，HAPD的稳定性，以及遇到的问题。本文还报告了用D*+→D0π慢+，D0 → K − π +控制样本和初始数据估计ARICH的PID性能。
The Belle II experiment at the SuperKEKB aims at collecting 50 times more data than its predecessor Belle. One of the key components in the experiment is the particle identification (PID), especially the separation of kaons and pions. In the Belle II spectrometer, a proximity focusing ring imaging Cherenkov detector using aerogel as a radiator (ARICH) is equipped for the PID at the forward endcap. In this counter, a total of 420 of hybrid avalanche photo-detectors (HAPDs) with 144 channels are used as position-sensitive photon detectors that work inside a 1.5 T magnetic field. Belle II started the physics run with full detectors from 2019. We report on the operation of ARICH, including the fraction of dead channels, stability of HAPDs, and encountered problems. We also report the PID performance of ARICH estimated with using D*+→D0πslow+ , D 0 → K − π + control sample with the initial data.