Study of cluster reconstruction and track fitting algorithms for CGEM-IT at BESIII  

作　　者：郭玥 王亮亮 鞠旭东 伍灵慧 修青磊 王海霞 董明义 胡静然 李卫东 李卫国 刘怀民 欧阳群 沈肖雁 袁野 张瑶 

机构地区：[1]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Central China Normal University,Wuhan 430079,China

出　　处：《Chinese Physics C》2016年第1期92-97,共6页中国物理C（英文版）

基　　金：Supported by National Key Basic Research Program of China(2015CB856700);National Natural Science Foundation of China(11205184,11205182);Joint Funds of National Natural Science Foundation of China(U1232201)

摘　　要：Considering the effects of aging on the existing Inner Drift Chamber （IDC） of BESIII, a GEM-based inner tracker, the Cylindrical-GEM Inner Tracker （CGEM-IT）, is proposed to be designed and constructed as an upgrade candidate for the IDC. This paper introduces a full simulation package for the CGEM-IT with a simplified digitization model, and describes the development of software for cluster reconstruction and track fitting, using a track fitting algorithm based on the Kalman filter method. Preliminary results for the reconstruction algorithms which are obtained using a Monte Carlo sample of single muon events in the CGEM-IT, show that the CGEM-IT has comparable momentum resolution and transverse vertex resolution to the IDC, and a better z-direction resolution than the IDC.Considering the effects of aging on the existing Inner Drift Chamber （IDC） of BESIII, a GEM-based inner tracker, the Cylindrical-GEM Inner Tracker （CGEM-IT）, is proposed to be designed and constructed as an upgrade candidate for the IDC. This paper introduces a full simulation package for the CGEM-IT with a simplified digitization model, and describes the development of software for cluster reconstruction and track fitting, using a track fitting algorithm based on the Kalman filter method. Preliminary results for the reconstruction algorithms which are obtained using a Monte Carlo sample of single muon events in the CGEM-IT, show that the CGEM-IT has comparable momentum resolution and transverse vertex resolution to the IDC, and a better z-direction resolution than the IDC.

关 键 词：BESIII CGEM-IT SIMULATION cluster reconstruction Kalman filter 

分 类 号：O572.21[理学—粒子物理与原子核物理]