Not-so-well-tempered neutralino

Profumo, Stefano; Stefaniak, Tim; Stephenson-Haskins, Laurel

doi:10.1103/physrevd.96.055018

Cited by 31 publications

(24 citation statements)

References 87 publications

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“…Such mass spectra and couplings are also expected in scenarios with neutralino dark matter compatible with indirect and direct detection constraints, see e.g. discussions in[56][57][58] 5. Depending on the exact SUSY spectrum, sizable electroweak corrections could appear for these calculations, see Ref [61,62]…”

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confidence: 69%

Heavy Higgs as a portal to the supersymmetric electroweak sector

Gori

Liu

Shakya

2019

J. High Energ. Phys.

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The electroweak sector of the Minimal Supersymmetric Standard Model (MSSM) -neutralinos, charginos and sleptons -remains relatively weakly constrained at the LHC due in part to the small production cross sections of these particles. In this paper, we study the prospects of searching for decays of heavy Higgs bosons into these superpartners at the high luminosity LHC. In addition to the kinematic handles offered by the presence of a resonant particle in the production chain, heavy Higgs decays can be the dominant production mode of these superpartners, making it possible to extend coverage to otherwise inaccessible regions of the supersymmetry and heavy Higgs parameter space. We illustrate our ideas with detailed collider analyses of two specific topologies: We propose search strategies for heavy Higgs decay to a pair of neutralinos, which can probe heavy Higgs bosons up to 1 TeV in the intermediate tan β(∼ 2 − 8) region, where standard heavy Higgs searches have no reach. Similarly, we show that targeted searches for heavy Higgs decays into staus can probe stau masses up to several hundred GeV. We also provide a general overview of additional decay channels that might be accessible at the high luminosity LHC. This motivates a broader program for LHC heavy Higgs searches.2 Note that there is also a recent ATLAS leptons plus / ET excess that can be related to new exotic decays of the heavy Higgs bosons [33][34][35].

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mentioning

confidence: 69%

Heavy Higgs as a portal to the supersymmetric electroweak sector

Gori

Liu

Shakya

2019

J. High Energ. Phys.

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“…Therefore, in our study, we will focus on the bino-like dark matter, which can give the observed relic density by mixing with higgsino/wino, resonantly annihilating through Z/Higgs bosons or coannihilating with other light sparticles. The first two mechanisms have been tightly constrained by current XENON1T and LHC experiments [40][41][42], while the coannihilation with light sparticles can still be consistent with current data [43].…”

Section: Neutralino Dark Matter and Muon G − 2 In The Mssmmentioning

confidence: 82%

Testing electroweak SUSY for muon g − 2 and dark matter at the LHC and beyond

Abdughani

Hikasa

et al. 2019

J. High Energ. Phys.

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Given that the LHC experiment has produced strong constraints on the colored supersymmetric particles (sparticles), testing the electroweak supersymmetry (EWSUSY) will be the next crucial task at the LHC. On the other hand, the light electroweakinos and sleptons in the EWSUSY can also contribute to the dark matter (DM) and low energy lepton observables. The precision measurements of them will provide the indirect evidence of SUSY. In this work, we confront the EWSUSY with the muon g − 2 anomaly, the DM relic density, the direct detection limits and the latest LHC Run-2 data. We find that the sneutrino DM or the neutralino DM with sizable higgsino component has been excluded by the direct detections. Then two viable scenarios are pinned down: one has the light compressed bino and sleptons but heavy higgsinos, and the other has the light compressed bino, winos and sleptons. In the former case, the LSP and slepton masses have to be smaller than about 350 GeV. While in the latter case, the LSP and slepton masses have to be smaller than about 700 GeV and 800 GeV, respectively. From investigating the observability of these sparticles in both scenarios at future colliders, it turns out that the HE-LHC with a luminosity of 15 ab −1 can exclude the whole BHL and most part of BWL scenarios at 2σ level. The precision measurement of the Higgs couplings at the lepton colliders could play a complementary role of probing the BWL scenario.

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“…Previous studies have investigated the combined impacts of various DM and collider constraints on the electroweakino sector, in the limit that other sparticles are decoupled [54][55][56][57][58][59][60][61][62][63][64][65][66][67][68]. Here, we carry out a more detailed, model-independent study, performing a global fit of the EWMSSM using only collider constraints from LEP, ATLAS and CMS arising either from direct searches for electroweakinos, or SM particle decays into them.…”

Section: Introductionmentioning

confidence: 99%

Combined collider constraints on neutralinos and charginos

et al. 2019

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Searches for supersymmetric electroweakinos have entered a crucial phase, as the integrated luminosity of the Large Hadron Collider is now high enough to compensate for their weak production cross-sections. Working in a framework where the neutralinos and charginos are the only light sparticles in the Minimal Supersymmetric Standard Model, we use GAMBIT to perform a detailed likelihood analysis of the electroweakino sector. We focus on the impacts of recent ATLAS and CMS searches with 36 fb −1 of 13 TeV proton-proton collision data. We also include constraints from LEP and invisible decays of the Z and Higgs bosons. Under the background-only hypothesis, we show that current LHC searches do not robustly exclude any range of neutralino or chargino masses. However, a pattern of excesses in several LHC analyses points towards a possible signal, with neutralino masses of (mχ0 1 , mχ0 2 , mχ0 3 , mχ0 4 ) = (8-155, 103-260, 130-473, 219-502) GeV and chargino masses of (mχ± 1 , mχ± 2 ) = (104-259, 224-507) GeV at the 95% confidence level. The lightest neutralino is mostly bino, with a possible modest Higgsino or wino component. We find that this excess has a combined local significance of 3.3σ, subject to a number of cautions. If one includes LHC searches for charginos and neutralinos conducted with 8 TeV proton-proton collision data, the local significance is lowered to 2.9σ. We briefly consider the implications a anders.kvellestad@fys.uio.no b martin.white@adelaide.edu.au for dark matter, finding that the correct relic density can be obtained through the Higgs-funnel and Z-funnel mechanisms, even assuming that all other sparticles are decoupled. All samples, GAMBIT input files and best-fit models from this study are available on Zenodo.

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Not-so-well-tempered neutralino

Cited by 31 publications

References 87 publications

Heavy Higgs as a portal to the supersymmetric electroweak sector

Heavy Higgs as a portal to the supersymmetric electroweak sector

Testing electroweak SUSY for muon g − 2 and dark matter at the LHC and beyond

Combined collider constraints on neutralinos and charginos

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