Alignment and measurement of the magnetic field for the BESIII muon counter

doi:10.1088/1674-1137/40/11/116001

	Alignment and measurement of the magnetic field for the BESIII muon counter
	Gao Q(高清); Zhang JZ(张景芝); Gao, Q; Zhang, JZ; Li, CH; Yin, JH; Yin JH(殷俊昊)
刊名	CHINESE PHYSICS C
	2016
卷号	40 期号:11
关键词	di-muon process MUC alignment magnetic field strength measurement
DOI	10.1088/1674-1137/40/11/116001
通讯作者	高清 ; 张景芝
文献子类	Article
英文摘要	Based on cosmic ray events without a magnetic field taken with the BESIII detector during the summer shutdown of BEPCII in 2012 and di-muon events from a data sample taken at center-of-mass energy of 3.686 GeV in 2009, we compare the coordinates of hits registered in the BESIII muon counter with the expected interaction point extrapolated from reconstructed tracks from the inner tracking system in the absence of a magnetic field. By minimizing the difference, we align the muon counter with the inner tracking system. Moreover, the strength of the magnetic field in the muon counter is measured for the first time with di-muon events from data taken at a center of-mass energy of 3.686 GeV. After the alignment and the magnetic field strength measurement, the offsets in the reconstructed hit positions for muon tracks are reduced, which improves the muon identification. The alignment and magnetic field strength measurement have been adopted in the latest version of the BESIII offline software system. This addition to the software reduces the systematic uncertainty for the physics analysis in cases where the muon counter information is used.
语种	英语
WOS记录号	WOS:000389144400016
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/261003]
专题	高能物理研究所_实验物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Gao Q,Zhang JZ,Gao, Q,et al. Alignment and measurement of the magnetic field for the BESIII muon counter[J]. CHINESE PHYSICS C,2016,40(11).
APA	高清.,张景芝.,Gao, Q.,Zhang, JZ.,Li, CH.,...&殷俊昊.(2016).Alignment and measurement of the magnetic field for the BESIII muon counter.CHINESE PHYSICS C,40(11).
MLA	高清,et al."Alignment and measurement of the magnetic field for the BESIII muon counter".CHINESE PHYSICS C 40.11(2016).