【摘要】 在JLab的A大厅上的小角度GDH实验中,因为散射截面及截面不对称度的测量需要干净的电子样本和足够的事例统计,径迹在簇射量能器和气体阈契仑柯夫探测器理的信息被用来完成粒子鉴别的任务.通过优化粒子在两种探测器里的信息筛选条件,可以得到较高的电子接收效率和π的去除能力.因为探测器的分辨能力与粒子的动量等运动学参量有关,所以对于不同的数据的粒子鉴别条件分别进行了优化,并得到了对应的电子接收效率和π的去除能力.更多还原

【Abstract】 To obtain a pure electron sample with high statistics,which is necessary for the asymmetry and cross section analysis for the small angle GDH experiment in JLab Hall-A,the information in shower and gas Cerenkov has been used in the particle identification.Due to the dependence of the kinematics,the PID cut and the corresponding efficiency have been optimized for different runs.更多还原