Primary vertex reconstruction based on the Kalman filter technique at BES

• Published in: Chinese physics C Vol. 34; no. 1; pp. 92 - 98
• Main Author: 徐敏 何康林 张子平 王贻芳 边渐鸣 傅成栋 黄彬 季晓斌 孙胜森 严亮 张建勇
• Format: Journal Article
• Language: English
• Published: Graduate University of Chinese Academy of Sciences, Beijing 100049, China 2010; Institute of High Energy Physics, CAS, Beijing 100049, China%Institute of High Energy Physics, CAS, Beijing 100049, China%Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China%Institute of High Energy Physics, CAS, Beijing 100049, China; Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
• Subjects: BES; 北京谱仪; 卡尔曼滤波技术; 卡尔曼滤波方法; 碰撞实验; 距离函数; Kalman method; BESIII; primary vertex
• ISSN: 1674-1137; 0254-3052

Primary vertex reconstruction is crucial to estimate the beam profile in collision experiments. We study the principle of an iterative process, called the Kalman filter method, and apply it to primary vertex reconstruction at BESⅢ. A Newton procedure to find the zero point of the distance function＇s gradient is used for primary vertex finding in 3-dimensional space. Results are obtained based on raw data at BESⅢ.