Observation of Z decays to four leptons with the CMS detector at the LHC
CMS Collaboration
刊名JOURNAL OF HIGH ENERGY PHYSICS
2012
期号12
关键词PARTICLE PAIR SEARCH BOSON ORDER
学科分类Physics
DOI10.1007/JHEP12(2012)034
通讯作者Chatrchyan, S (reprint author), Yerevan Phys Inst, Yerevan 375036, Armenia.
英文摘要The first observation of the Z boson decaying to four leptons in proton-proton collisions is presented. The analyzed data set corresponds to an integrated luminosity of 5.02 fb(-1) at root s = 7 TeV collected by the CMS detector at the Large Hadron Collider. A pronounced resonance peak, with a statistical significance of 9.7 sigma, is observed in the distribution of the invariant mass of four leptons (electrons and/or muons) with mass and width consistent with expectations for Z boson decays. The branching fraction and cross section reported here are defined by phase space restrictions on the leptons, namely, 80 < m(4l) < 100 GeV, where m(4l) is the invariant mass of the four leptons, and m(ll) > 4 GeV for all pairs of leptons, where m(ll) is the two-lepton invariant mass. The measured branching fraction is B(Z -> 4(l)) = 4.2(-0.8)(+0.9)(stat.) +/- 0.2(syst.)) x 10(-6) and agrees with the standard model prediction of 4.45 x 10(-6). The measured cross section times branching fraction is sigma(pp -> Z) B (Z -> 4l) = 112(-20)(+23)(stat.) +/-(+7)(-5)(syst.)(-2)(+3) (lumi.) fb, also consistent with the standard model prediction of 120 fb. The four-lepton mass peak arising from Z -> 4l decays provides a calibration channel for the Higgs boson search in the H -> ZZ -> 4l decay mode.
类目[WOS]Physics, Particles & Fields
收录类别SCI
语种英语
WOS记录号WOS:000313123800034
引用统计
被引频次:11[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/311005/213422
专题中国科学院高能物理研究所_粒子天体物理中心_期刊论文
作者单位中国科学院高能物理研究所
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CMS Collaboration. Observation of Z decays to four leptons with the CMS detector at the LHC[J]. JOURNAL OF HIGH ENERGY PHYSICS,2012(12).
APA CMS Collaboration.(2012).Observation of Z decays to four leptons with the CMS detector at the LHC.JOURNAL OF HIGH ENERGY PHYSICS(12).
MLA CMS Collaboration."Observation of Z decays to four leptons with the CMS detector at the LHC".JOURNAL OF HIGH ENERGY PHYSICS .12(2012).
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