Trigger Efficiency Measurement in R Scan Experiment

HUANG Guang-Shun; LI Zhong-Chao; YUAN Chang-Zheng; QI Xiang-Rong; ZHAO Di-Xin; GUO Ya-Nan; GU Jian-Hui; YU Zhong-Qiang; LI Xiao-Nan; ZHANG Jia-Wen; ZHAO Zheng-Guo

Chinese Physics C> 2001, Vol. 25> Issue(9) : 889-897

Trigger Efficiency Measurement in R Scan Experiment

China Center of Advanced Science and Technology, Beijing 100080, China2 Institute of High Energy Physics, CAS, Beijing 100039, China

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Abstract：
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.

References

[1]

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HUANG Guang-Shun, LI Zhong-Chao, YUAN Chang-Zheng, QI Xiang-Rong, ZHAO Di-Xin, GUO Ya-Nan, GU Jian-Hui, YU Zhong-Qiang, LI Xiao-Nan, ZHANG Jia-Wen and ZHAO Zheng-Guo. Trigger Efficiency Measurement in R Scan Experiment[J]. Chinese Physics C, 2001, 25(9): 889-897.

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Received: 2000-09-29
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Trigger Efficiency Measurement in R Scan Experiment

Corresponding author: HUANG Guang-Shun,

China Center of Advanced Science and Technology, Beijing 100080, China2 Institute of High Energy Physics, CAS, Beijing 100039, China

Received Date: 2000-09-29
Accepted Date: 1900-01-01
Available Online: 2001-09-05

Abstract: 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.