Chinese Physics C > 2002, Vol. 26 > Issue(2): 172-179

Introduction of the Trigger System and the Measurement for Trigger Efficiency at L3+Cosmics Experiment

Institute of High Physics, CAS, Beijing 100039, China

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Abstract：
The trigger process of L3+Cosmics experiment at CERN is introduced briefly. Also we checked whether the settings of L3+Cosmics trigger system by simulation are correct or not and introduced a method on trigger efficiency calculation. To get trigger efficiency for μ spectrum measurement, an experimental data sample, which includes events passing the trigger set to measure the μ spectrum and not passing, is needed. Then L?3+C trigger process is simulated with these events in this sample to know how many events should pass the trigger. By checking a trigger bit recorded in the experimental data, one can know how many events passed the trigger in hardware in these simulated events. The ratio then determines the trigger efficiency for μ spectrum measurement. And the systematic error is analyzed. The results on trigger efficiency have been used to the measurement of μ spectrum.

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LI Zhong-Chao, YU Zhong-Qiang, GUO Ya-Nan, XU Yu-Peng, YAO Zhi-Guo and LI De. Introduction of the Trigger System and the Measurement for Trigger Efficiency at L3+Cosmics Experiment[J]. Chinese Physics C, 2002, 26(2): 172-179.

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Received: 2001-04-28
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

Introduction of the Trigger System and the Measurement for Trigger Efficiency at L3+Cosmics Experiment

Corresponding author:LI Zhong-Chao,

Institute of High Physics, CAS, Beijing 100039, China

Received Date:2001-04-28
Accepted Date:1900-01-01
Available Online:2002-02-05

Abstract:The trigger process of L3+Cosmics experiment at CERN is introduced briefly. Also we checked whether the settings of L3+Cosmics trigger system by simulation are correct or not and introduced a method on trigger efficiency calculation. To get trigger efficiency for μ spectrum measurement, an experimental data sample, which includes events passing the trigger set to measure the μ spectrum and not passing, is needed. Then L?3+C trigger process is simulated with these events in this sample to know how many events should pass the trigger. By checking a trigger bit recorded in the experimental data, one can know how many events passed the trigger in hardware in these simulated events. The ratio then determines the trigger efficiency for μ spectrum measurement. And the systematic error is analyzed. The results on trigger efficiency have been used to the measurement of μ spectrum.