粒子鉴别中dE/dx和TOF的权重

Weight of dE/dx and TOF in Particle Identification

在北京谱仪数据分析中 ,粒子鉴别使用了dE/dx和TOF的信息 .在利用dE/dx和TOF联合鉴别粒子时 ,通常的做法是把两者的 χ2 值等权重相加 (χ2 方法 ) .在不同的动量区间 ,dE/dx和TOF对粒子的鉴别能力不同 .本文给出两者联合鉴别时不同动量区间的权重 。

In the analysis of Beijing Spectrometer (BES) data, the dE/dx and TOF information have been used in the particle identification. When combining the dE/dx and TOF information to do the particle identification, the χ 2 of dE/dx and TOF are usually added with equal weight. But the particle identification capability of dE/dx and TOF is different in different momentum region. In this paper, we give the weights of dE/dx and TOF in different momentum region and form a new variable which uses different weights for dE/dx and TOF informations to do the particle identification.