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Application of the parametric formulae for electromagnetic showers in unconverted gamma/pi(0) discrimination
Tao JQ(陶军全); Chen GM(陈国明); Yang M(杨民); Bian JG(卞建国); Li ZH(李祖豪); Liang S(梁松); Meng XW(孟祥伟); Tang ZC(唐志成); Wang J(王健); Wang Z(王征); Xiao H(肖虹); Xu M(徐明); Zang JJ(藏京京); Zhang ZX(张振霞); Tao, JQ; Chen, GM; Yang, M; Bian, JG; Li, ZH; Liang, S; Meng, XW; Tang, ZC; Wang, JA; Wang, JA; Wang, XY; Wang, Z; Xiao, H; Xu, M; Zang, JJ; Zhang, ZX
2011
发表期刊CHINESE PHYSICS C
卷号35期号:3页码:#REF!
通讯作者Tao, JQ (reprint author), Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.
摘要In the LHC experiment, the neutral pions produced during jet fragmentation are the background sources for all physics channels with high-energy photons in their final state. In this paper, the application of the three-dimensional parametric formula for electromagnetic (EM) showers, which we developed in the Alpha Magnetic Spectrometer II experiment, is presented to distinguish the unconverted photons from the neutral pions. With the constructed electromagnetic calorimeter (ECAL) in a GEANT4 simulation, the parametric formulae were validated and the unconverted gamma/pi(0) discrimination was performed with the Toolkit for Multivariate Data Analysis (TMVA) package in ROOT for different transverse energies ranging from 15 GeV to 75 GeV, which is the most sensitive region for light Higgs (with mass similar to 120 GeV) searches with the channel H -> gamma gamma. With this discrimination method and the selected transverse energy region, we can reject pi(0) with the efficiency from similar to 40% (65-75 GeV) to similar to 90% (15-25 GeV) when keeping 90% gamma efficiency.
文章类型Article
关键词electromagnetic shower parametric formulae gamma/pi(0) discrimination
学科领域Physics
DOI10.1088/1674-1137/35/3/011
收录类别SCI
WOS类目Physics, Nuclear ; Physics, Particles & Fields
WOS记录号WOS:000287952400011
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/227306
专题粒子天体物理中心
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GB/T 7714
Tao JQ,Chen GM,Yang M,et al. Application of the parametric formulae for electromagnetic showers in unconverted gamma/pi(0) discrimination[J]. CHINESE PHYSICS C,2011,35(3):#REF!.
APA 陶军全.,陈国明.,杨民.,卞建国.,李祖豪.,...&Zhang, ZX.(2011).Application of the parametric formulae for electromagnetic showers in unconverted gamma/pi(0) discrimination.CHINESE PHYSICS C,35(3),#REF!.
MLA 陶军全,et al."Application of the parametric formulae for electromagnetic showers in unconverted gamma/pi(0) discrimination".CHINESE PHYSICS C 35.3(2011):#REF!.
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