Closing up a light stop window in natural SUSY at LHC

doi:http://dx.doi.org/10.1016/j.physletb.2016.02.003

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	Closing up a light stop window in natural SUSY at LHC
	Kobakhidze, A 2; Liu, N ; Wu, L 2; Yang, JM; Zhang, MC
刊名	PHYSICS LETTERS B
	2016
卷号	755 页码:76-81
关键词	MADANALYSIS 5 DARK-MATTER ELECTROWEAK BARYOGENESIS PP COLLISIONS FORTRAN CODE MSSM BREAKING DECAYS SQUARK COLLIDERS
DOI	http://dx.doi.org/10.1016/j.physletb.2016.02.003
英文摘要	Top squark (stop) plays a key role in the radiative stability of the Higgs boson mass in supersymmetry (SUSY). In this work, we use the LHC Run-1 data to determine the lower mass limit of the right-handed stop in a natural SUSY scenario, where the higgsinos (chi) over tilde (0)(1,2) and (chi) over tilde (+/-)(1) are light and nearly degenerate. We find that the stop mass has been excluded up to 430 GeV for m((chi) over tilde 10) less than or similar to 250 GeV and to 540 GeV for m m((chi) over tilde 10) similar or equal to 100 GeV by the Run-1 SUSY searches for 2b + E-T(miss) and 1l + jets+ E-T(miss), respectively. In a small strip of parameter space with m((chi) over tilde 10) greater than or similar to 190GeV, the stop mass can still be as light as 210 GeV and compatible with the Higgs mass measurement and the monojet bound. The 14 TeV LHC with a luminosity of 20 fb(-1) can further cover such a light stop window by monojet and 2b + E-T(miss) searches and push the lower bound of the stop mass to 710 GeV. We also explore the potential to use the Higgs golden ratio, D gamma gamma = sigma(pp -> h -> gamma gamma)/sigma(pp -> h -> ZZ* -> 4l(+)), as a complementary probe for the light and compressed stop. If this golden ratio can be measured at percent level at the high luminosity LHC (HL-LHC) or future e(+)e(-) colliders, the light stop can be excluded for most of the currently allowed parameter region. (C) 2016 The Authors. Published by Elsevier B.V.
学科主题	Astronomy & Astrophysics ; Physics
语种	英语
资助机构	Australian Research Council ; National Natural Science Foundation of China (NNSFC) [11275057, 11305049, 11375001, 11405047, 11135003, 11275245] ; Specialised Research Fund for the Doctoral Program of Higher Education [20134104120002] ; Startup Foundation for Doctors of Henan Normal University [11112] ; Joint Funds of the National Natural Science Foundation of China [U1404113]
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/23062]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan 2.Henan Normal Univ, Inst Theoret Phys, Xinxiang 453007, Peoples R China 3.Univ Sydney, Sch Phys, ARC Ctr Excellence Particle Phys Terascale, Sydney, NSW 2006, Australia 4.Acad Sinica, Inst Theoret Phys, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Kobakhidze, A,Liu, N,Wu, L,et al. Closing up a light stop window in natural SUSY at LHC[J]. PHYSICS LETTERS B,2016,755:76-81.
APA	Kobakhidze, A,Liu, N,Wu, L,Yang, JM,&Zhang, MC.(2016).Closing up a light stop window in natural SUSY at LHC.PHYSICS LETTERS B,755,76-81.
MLA	Kobakhidze, A,et al."Closing up a light stop window in natural SUSY at LHC".PHYSICS LETTERS B 755(2016):76-81.