Signatures of Dirac and Majorana sterile neutrinos in trilepton events at the LHC

doi:10.1103/PhysRevD.95.115020

	Signatures of Dirac and Majorana sterile neutrinos in trilepton events at the LHC
	Dib, CO; Wang, KC; Wang KC(王科臣); Kim, CS
刊名	PHYSICAL REVIEW D
	2017
卷号	95 期号:11 页码:115020
ISSN号	2470-0010
DOI	10.1103/PhysRevD.95.115020
文献子类	Article
英文摘要	Heavy sterile neutrinos with masses below MW can induce trilepton events at the 14 TeV LHC through purely leptonic W decays of W-+/--> e(+/-) e(+/-) mu(+/-)nu. and mu(+/-)mu(+/-)e(+/-)nu. where the heavy neutrino will be in an intermediate state on its mass shell. Discovery and exclusion limits for the heavy neutrinos are found using both cut-and-count (CC) and multivariate analysis (MVA) methods in this study. We also show that it is possible to discriminate between a Dirac and a Majorana heavy neutrino, even when lepton number conservation cannot be directly tested due to unobservability of the final state neutrino. This discrimination is done by exploiting a combined set of kinematic observables that differ between the Majorana and Dirac cases. We find that the MVA method can greatly enhance the discovery and discrimination limits in comparison with the CC method. For a 14-TeV pp collider with integrated luminosity of 3000 fb(-1), sterile neutrinos can be found with 5s significance if heavy-to-light neutrino mixings vertical bar U-Ne broken vertical bar(2)similar to vertical bar U-N mu vertical bar(2) similar to 10(-6), while the Majorana vs Dirac type can be distinguished if vertical bar U-Ne broken vertical bar(2)similar to vertical bar U-N mu vertical bar(2) similar to 10(-5) or even U-N mu vertical bar(2) similar to 10(-6) if one of the mixing elements is at least an order of magnitude smaller than the other.
电子版国际标准刊号	2470-0029
WOS关键词	DOUBLE-BETA DECAY ; LEPTON NUMBER ; MASSES ; VIOLATION ; MU(+/-)MU(+/-) ; MIXINGS ; SEARCH ; MODELS
WOS研究方向	Astronomy & Astrophysics ; Physics
语种	英语
WOS记录号	WOS:000403493200007
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/284497]
专题	高能物理研究所_理论物理室
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	Dib, CO,Wang, KC,Wang KC,et al. Signatures of Dirac and Majorana sterile neutrinos in trilepton events at the LHC[J]. PHYSICAL REVIEW D,2017,95(11):115020.
APA	Dib, CO,Wang, KC,王科臣,&Kim, CS.(2017).Signatures of Dirac and Majorana sterile neutrinos in trilepton events at the LHC.PHYSICAL REVIEW D,95(11),115020.
MLA	Dib, CO,et al."Signatures of Dirac and Majorana sterile neutrinos in trilepton events at the LHC".PHYSICAL REVIEW D 95.11(2017):115020.