Search for long-lived particles that decay into final states containing two electrons or two muons in proton-proton collisions at root s=8Tev

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	Search for long-lived particles that decay into final states containing two electrons or two muons in proton-proton collisions at root s=8Tev
	CMS Collaboration
刊名	PHYSICAL REVIEW D
	2015
卷号	91 期号:5 页码:52012
英文摘要	A search is performed for long-lived particles that decay into final states that include a pair of electrons or a pair of muons. The experimental signature is a distinctive topology consisting of a pair of charged leptons originating from a displaced secondary vertex. Events corresponding to an integrated luminosity of 19.6 (20.5) fb(-1) in the electron (muon) channel were collected with the CMS detector at the CERN LHC in proton-proton collisions at root s TeV. No significant excess is observed above standard model expectations. Upper limits on the product of the cross section and branching fraction of such a signal are presented as a function of the long-lived particle's mean proper decay length. The limits are presented in an approximately model-independent way, allowing them to be applied to a wide class of models yielding the above topology. Over much of the investigated parameter space, the limits obtained are the most stringent to date. In the specific case of a model in which a Higgs boson in the mass range 125-1000 GeV/c(2) decays into a pair of long-lived neutral bosons in the mass range 20-350 GeV= c(2), each of which can then decay to dileptons, the upper limits obtained are typically in the range 0.2-10 fb for mean proper decay lengths of the long-lived particles in the range 0.01-100 cm. In the case of the lowest Higgs mass considered (125 GeV/c(2)), the limits are in the range 2-50 fb. These limits are sensitive to Higgs boson branching fractions as low as 10(-1).
学科主题	Astronomy & Astrophysics; Physics
类目[WOS]	Astronomy & Astrophysics ; Physics, Particles & Fields
收录类别	SCI
WOS记录号	WOS:000352154400001
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/228356]
专题	高能物理研究所_粒子天体物理中心
推荐引用方式 GB/T 7714	CMS Collaboration. Search for long-lived particles that decay into final states containing two electrons or two muons in proton-proton collisions at root s=8Tev[J]. PHYSICAL REVIEW D,2015,91(5):52012.
APA	CMS Collaboration.(2015).Search for long-lived particles that decay into final states containing two electrons or two muons in proton-proton collisions at root s=8Tev.PHYSICAL REVIEW D,91(5),52012.
MLA	CMS Collaboration."Search for long-lived particles that decay into final states containing two electrons or two muons in proton-proton collisions at root s=8Tev".PHYSICAL REVIEW D 91.5(2015):52012.