Online monitoring of the center-of-mass energy from real data at BESIII

被引：7
|
作者：
Lu, Jiada [1 ,2 ]
Xiao, Yanjia [1 ,2 ]
Ji, Xiaobin [1 ,2 ]
机构：
[1] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
RADIATION DETECTION TECHNOLOGY AND METHODS | 2020年 / 4卷 / 03期
基金：
中国国家自然科学基金;
关键词：
DQM; Center-of-mass energy; Bhabha process;
D O I：
10.1007/s41605-020-00188-8
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
Background Data Quality Monitoring system (DQM) was developed to monitor data quality at BESIII experiment in real time. The stable center-of-mass energy (E-cms) is essential for the data taking. Online monitoring the E-cms can help find the beam energy shift in time. Purpose The purpose is to monitor the E-cms in DQM system in real time. Methods The E-cms is measured using Bhabha scattering process in DQM system, due to its large cross section and low background level. The E-cms is calculated from the invariant mass of e(+)e(-), and the correction value from radiation effect and momentum calibration. Result The E-cms calculated with DQM system shows a good consistency with that from offline reconstruction within error. The results are validated with data taken in 2013. The overall systematic uncertainty includes 0.39 MeV/c(2) from signal extraction and 2.54 MeV/c(2) from calibration and radiation correction. Conclusions The E-cms calculated from Bhabha scattering process is now available on DQM system in real time, which can be used as references for researchers to operate BESIII experiment.
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页码：337 / 344
页数：8
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