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Kobakhidze, A1; Liu, N; Wu, L1; Yang, JM; Zhang, MC
Closing up a light stop window in natural SUSY at LHC
Source PublicationPHYSICS LETTERS B
AbstractTop 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.
Subject AreaAstronomy & Astrophysics ; Physics
Indexed BySCI
Funding OrganizationAustralian 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]
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Document Type期刊论文
Affiliation1.Henan Normal Univ, Inst Theoret Phys, Xinxiang 453007, Peoples R China
2.Univ Sydney, Sch Phys, ARC Ctr Excellence Particle Phys Terascale, Sydney, NSW 2006, Australia
3.Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan
4.Acad Sinica, Inst Theoret Phys, Beijing 100190, Peoples R China
Recommended Citation
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.
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