Search for direct top squark pair production in events with a Higgs or Z boson, and missing transverse momentum in root s=13 TeV pp collisions with the ATLAS detector

doi:10.1007/JHEP08(2017)006

	Search for direct top squark pair production in events with a Higgs or Z boson, and missing transverse momentum in root s=13 TeV pp collisions with the ATLAS detector
	ATLAS Collaboration
刊名	JOURNAL OF HIGH ENERGY PHYSICS
	2017
期号	8 页码:6
关键词	Beyond Standard Model Hadron-Hadron scattering (experiments) Higgs physics
ISSN号	1029-8479
DOI	10.1007/JHEP08(2017)006
文献子类	Article
英文摘要	A search for direct top squark pair production resulting in events with either a same-flavour opposite-sign dilepton pair with invariant mass compatible with a Z boson or a pair of jets compatible with a Standard Model (SM) Higgs boson (h) is presented. Requirements on the missing transverse momentum, together with additional selections on leptons, jets, jets identified as originating from b-quarks are imposed to target the other decay products of the top squark pair. The analysis is performed using proton-proton collision data at root s = 13 TeV collected with the ATLAS detector at the LHC in 20152016, corresponding to an integrated luminosity of 36.1 fb(-1). No excess is observed in the data with respect to the SM predictions. The results are interpreted in two sets of models. In the first set, direct production of pairs of lighter top squarks ((t) over tilde (1)) with long decay chains involving Z or Higgs bosons is considered. The second set includes direct pair production of the heavier top squark pairs ((t) over tilde (2)) decaying via (t) over tilde (2) -> Z (t) over tilde (1) or (t) over tilde (2) -> h (t) over tilde (1). The results exclude at 95% confidence level (t) over tilde (2) and (t) over tilde (1) masses up to about 800 GeV, extending the exclusion region of supersymmetric parameter space covered by previous LHC searches.
WOS关键词	HADRON COLLIDERS ; GLUINO PRODUCTION ; SUPERSYMMETRY ; PARTICLE ; EXTENSION
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000406886200006
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/284582]
专题	高能物理研究所_实验物理中心
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	ATLAS Collaboration. Search for direct top squark pair production in events with a Higgs or Z boson, and missing transverse momentum in root s=13 TeV pp collisions with the ATLAS detector[J]. JOURNAL OF HIGH ENERGY PHYSICS,2017(8):6.
APA	ATLAS Collaboration.(2017).Search for direct top squark pair production in events with a Higgs or Z boson, and missing transverse momentum in root s=13 TeV pp collisions with the ATLAS detector.JOURNAL OF HIGH ENERGY PHYSICS(8),6.
MLA	ATLAS Collaboration."Search for direct top squark pair production in events with a Higgs or Z boson, and missing transverse momentum in root s=13 TeV pp collisions with the ATLAS detector".JOURNAL OF HIGH ENERGY PHYSICS .8(2017):6.