Measurements of the pp -> ZZ production cross section and the Z -> 4l branching fraction, and constraints on anomalous triple gauge couplings at root s=13TeV

doi:10.1140/epjc/s10052-018-5567-9

CORC > 高能物理研究所 > 中国科学院高能物理研究所 > 粒子天体物理中心

	Measurements of the pp -> ZZ production cross section and the Z -> 4l branching fraction, and constraints on anomalous triple gauge couplings at root s=13TeV
	CMS Collaboration
刊名	EUROPEAN PHYSICAL JOURNAL C
	2018
卷号	78 期号:2 页码:165
ISSN号	1434-6044
DOI	10.1140/epjc/s10052-018-5567-9
文献子类	Article
英文摘要	Four-lepton production in proton-proton collisions, pp -> (Z/gamma)(Z/gamma) -> 4l, where l = e or mu, is studied at a center-of-mass energy of 13 TeV with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 35.9 fb(-1). The ZZ production cross section, sigma(pp -> ZZ) = 17.2 +/- 0.5 (stat) +/- 0.7 (syst) +/- 0.4 (theo) +/- 0.4 (lumi) pb, measured using events with two opposite-sign, same-flavor lepton pairs produced in the mass region 60 < m(l+l-) < 120 GeV, is consistent with standard model predictions. Differential cross sections are measured and are well described by the theoretical predictions. The Z boson branching fraction to four leptons is measured to be B(Z -> 4l) = 4.83(-0.22)(+0.23) (stat)(-0.29)(+0.32) (syst) +/- 0.08 (theo) +/- 0.12(lumi) x 10(-6) for events with a four-lepton invariant mass in the range 80 < m(4l) < 100 GeV and a dilepton mass m(ll) > 4GeV for all opposite-sign, same-flavor lepton pairs. The results agree with standard model predictions. The invariant mass distribution of the four-lepton system is used to set limits on anomalous ZZZ and ZZ. couplings at 95% confidence level: -0.0012 < f(4)(Z) < 0.0010, -0.0010 < f(5)(Z) < 0.0013, -0.0012 < f(4)(gamma) < 0.0013, -0.0012 < f(5)(gamma) < 0.0013.
电子版国际标准刊号	1434-6052
WOS关键词	FINAL-STATES ; NNLO QCD ; COLLISIONS ; COLLIDERS ; LHC ; TEV
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000426484600003
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/285697]
专题	高能物理研究所_粒子天体物理中心
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	CMS Collaboration. Measurements of the pp -> ZZ production cross section and the Z -> 4l branching fraction, and constraints on anomalous triple gauge couplings at root s=13TeV[J]. EUROPEAN PHYSICAL JOURNAL C,2018,78(2):165.
APA	CMS Collaboration.(2018).Measurements of the pp -> ZZ production cross section and the Z -> 4l branching fraction, and constraints on anomalous triple gauge couplings at root s=13TeV.EUROPEAN PHYSICAL JOURNAL C,78(2),165.
MLA	CMS Collaboration."Measurements of the pp -> ZZ production cross section and the Z -> 4l branching fraction, and constraints on anomalous triple gauge couplings at root s=13TeV".EUROPEAN PHYSICAL JOURNAL C 78.2(2018):165.