Search for narrow resonances in dilepton mass spectra in proton-proton collisions at root s=13 TeV and combination with 8 TeV data

doi:10.1016/j.physletb.2017.02.010

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	Search for narrow resonances in dilepton mass spectra in proton-proton collisions at root s=13 TeV and combination with 8 TeV data
	CMS Collaboration
刊名	PHYSICS LETTERS B
	2017
卷号	768 页码:57-80
关键词	CMS Dileptons Narrow resonances Extra dimensions
ISSN号	0370-2693
DOI	10.1016/j.physletb.2017.02.010
文献子类	Article
英文摘要	A search for narrow resonances in dielectron and dimuon invariant mass spectra has been performed using data obtained from proton-proton collisions at root s = 13 TeV collected with the CMS detector. The integrated luminosity for the dielectron sample is 2.7 fb(-1) and for the dimuon sample 2.9 fb(-1). The sensitivity of the search is increased by combining these data with a previously analyzed set of data obtained at root s = 8 TeV and corresponding to a luminosity of 20 fb(-1). No evidence for non-standard-model physics is found, either in the 13 TeV data set alone, or in the combined data set. Upper limits on the product of production cross section and branching fraction have also been calculated in a model-independent manner to enable interpretation in models predicting a narrow dielectron or dimuon resonance structure. Limits are set on the masses of hypothetical particles that could appear in new-physics scenarios. For the Z'(SSM) particle, which arises in the sequential standard model, and for the superstring inspired Z'(psi) particle, 95% confidence level lower mass limits for the combined data sets and combined channels are found to be 3.37 and 2.82 TeV, respectively. The corresponding limits for the lightest Kaluza-Klein graviton arising in the Randall-Sundrum model of extra dimensions with coupling parameters 0.01 and 0.10 are 1.46 and 3.11 TeV, respectively. These results significantly exceed the limits based on the 8 TeV LHC data. (C) 2017 The Author. Published by Elsevier B.V.
电子版国际标准刊号	1873-2445
WOS研究方向	Astronomy & Astrophysics ; Physics
语种	英语
WOS记录号	WOS:000400677700010
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/284326]
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. Search for narrow resonances in dilepton mass spectra in proton-proton collisions at root s=13 TeV and combination with 8 TeV data[J]. PHYSICS LETTERS B,2017,768:57-80.
APA	CMS Collaboration.(2017).Search for narrow resonances in dilepton mass spectra in proton-proton collisions at root s=13 TeV and combination with 8 TeV data.PHYSICS LETTERS B,768,57-80.
MLA	CMS Collaboration."Search for narrow resonances in dilepton mass spectra in proton-proton collisions at root s=13 TeV and combination with 8 TeV data".PHYSICS LETTERS B 768(2017):57-80.