摘要
介绍了北京正负电子对撞机 (BEPC) /北京谱仪 (BES)R值扫描实验中触发效率的测量方法 ,BES触发判选系统触发条件表的设置 ,给出了R值测量实验期间各触发条件。
A method is introduced to measure the trigger efficiency in R scan experiment carried out with BESII at BEPC. The design of trigger table, offline event selection and calculation of efficiency are described. The principle of trigger efficiency measurement is: a data sample for specific physics event type is chosen orthogonally to certain trigger condition at both online trigger level and offline selection level; and then the ratio of number of events in the sample which satisfy the trigger condition to the total number of events in the sample is the efficiency of this trigger condition. The efficiencies of various trigger conditions, trigger channels and event types are given.
出处
《高能物理与核物理》
EI
CSCD
北大核心
2001年第9期889-897,共9页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金 (1 9991 4 80
1 982 5 1 1 6
1 980 5 0 0 9)
中国科学院重大及特别支持项目 (KJ95T -0 3 )
中国科学院百人计划基金资助~~
