BESⅡ物理分析中的多变量粒子鉴别方法

Multi-Variable Particle ID for BESⅡ Physics Analysis

以北京谱仪 (BESⅡ )上常用的粒子鉴别方法 (联合TOF测得的飞行时间和MDC的dE dx)为基础 ,尝试利用TOF的Q值和BSC的沉积能量 ,发展基于多变量的粒子鉴别 .将新的方法应用于p p的鉴别 ,对粒子鉴别的效率、误判率和引进的系统误差进行了仔细的研究 。

A multi-variable particle identification method is developed for the BESⅡ physics analysis. Besides the traditionally used TOF-T and dE/dx information, TOF-Q and BSC-E are also used to improve the particle discrimination ability. It is shown that the particle identification efficiency, misidentification probability and systematic error could be improved with this new method. The multi-variable method can be extended to even more variables, and can be used in other experiments.