Dark matter in a constrained E 6 inspired SUSY model

Athron, Peter; Harries, Dylan; Nevzorov, R.; Williams, Anthony G.

doi:10.1007/jhep12(2016)128

Cited by 32 publications

(23 citation statements)

References 180 publications

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“…If the LSP is instead a "welltempered" [301] admixture of Higgsino and bino 9 , then the efficiency of the co-annihilation effect can be tuned to give the exact observed relic density, even at very low neutralino masses. Such scenarios are, however, heavily constrained by recent LUX [228,229] and Panda-X [230] limits on the spin-independent scattering cross-section [309][310][311]. As we see in the low-mass section of Fig.…”

Section: Cmssmmentioning

confidence: 94%

Global fits of GUT-scale SUSY models with GAMBIT

Athron¹,

Balázs²,

Bringmann³

et al. 2017

Eur. Phys. J. C

Self Cite

103

126

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We present the most comprehensive global fits to date of three supersymmetric models motivated by grand unification: the Constrained Minimal Supersymmetric Standard Model (CMSSM), and its Non-Universal Higgs Mass generalisations NUHM1 and NUHM2. We include likelihoods from a number of direct and indirect dark matter searches, a large collection of electroweak precision and flavour observables, direct searches for supersymmetry at LEP and Runs I and II of the LHC, and constraints from Higgs observables. Our analysis improves on existing results not only in terms of the number of included observables, but also in the a e-mail: peter.athron@coepp. level of detail with which we treat them, our sampling techniques for scanning the parameter space, and our treatment of nuisance parameters. We show that stau co-annihilation is now ruled out in the CMSSM at more than 95% confidence. Stop co-annihilation turns out to be one of the most promising mechanisms for achieving an appropriate relic density of dark matter in all three models, whilst avoiding all other constraints. We find high-likelihood regions of parameter space featuring light stops and charginos, making them potentially detectable in the near future at the LHC. We also show that tonne-scale direct detection will play a largely complementary role, probing large parts of the remaining viable parameter space, including essentially all models with multi-TeV neutralinos.

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Section: Cmssmmentioning

confidence: 94%

Global fits of GUT-scale SUSY models with GAMBIT

Athron¹,

Balázs²,

Bringmann³

et al. 2017

Eur. Phys. J. C

Self Cite

103

126

View full text Add to dashboard Cite

show abstract

“…Some of these phenomenological features have been observed in global fit studies of supersymmetric models, see e.g. Refs [29][30][31][32][33]…”

mentioning

confidence: 85%

Not-so-well-tempered neutralino

2017

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Light electroweakinos, the neutral and charged fermionic supersymmetric partners of the Standard Model SU(2) × U(1) gauge bosons and of the two SU(2) Higgs doublets, are an important target for searches for new physics with the Large Hadron Collider (LHC). However, if the lightest neutralino is the dark matter, constraints from direct dark matter detection experiments rule out large swaths of the parameter space accessible to the LHC, including in large part the so-called "well-tempered" neutralinos. We focus on the Minimal Supersymmetric Standard Model (MSSM) and explore in detail which regions of parameter space are not excluded by null results from direct dark matter detection, assuming exclusive thermal production of neutralinos in the early universe, and illustrate the complementarity with current and future LHC searches for electroweak gauginos. We consider both bino-Higgsino and bino-wino "not-so-well-tempered" neutralinos, i.e. we include models where the lightest neutralino constitutes only part of the cosmological dark matter, with the consequent suppression of the constraints from direct and indirect dark matter searches.

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“…The presence of very light neutral fermions in the particle spectrum might also have interesting implications for the neutrino physics (see, for example [123]). The invariance of the Lagrangian under the Z M 2 ensures that the lightest R-parity odd state with Z E 2 = +1, which is most commonly the lightest ordinary neutralino in this case, is also stable and may account for all or some of the observed cold dark matter density [106].…”

Section: The U (1) N Extensions Of the Mssmmentioning

confidence: 99%

A Review of the Exceptional Supersymmetric Standard Model

2020

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Local supersymmetry (SUSY) provides an attractive framework for the incorporation of gravity and unification of gauge interactions within Grand Unified Theories (GUTs). Its breakdown can lead to a variety of models with softly broken SUSY at low energies. In this review article we focus on the SUSY extension of the Standard Model (SM) with an extra U (1) N gauge symmetry originating from a string-inspired E 6 grand unified gauge group. Only in this U (1) extension of the minimal supersymmetric standard model (MSSM) inspired by E 6 GUTs the right-handed neutrinos can be superheavy providing a mechanism for the generation of the lepton and baryon asymmetry of the Universe. The particle content of this exceptional supersymmetric standard model (E 6 SSM) includes three 27 representations of the E 6 group, to ensure anomaly cancellation, plus a pair of SU (2) W doublets as required for gauge coupling unification. Thus E 6 SSM involves extra exotic matter beyond the MSSM. We consider symmetries that permit to suppress non-diagonal flavour transitions and rapid proton decay, as well as gauge coupling unification, the breakdown of the gauge symmetry and the spectrum of Higgs bosons in this model. The possible Large Hadron Collider (LHC) signatures caused by the presence of exotic states are also discussed. * nevzorov@itep.ru

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Dark matter in a constrained E 6 inspired SUSY model

Cited by 32 publications

References 180 publications

Global fits of GUT-scale SUSY models with GAMBIT

Global fits of GUT-scale SUSY models with GAMBIT

Not-so-well-tempered neutralino

A Review of the Exceptional Supersymmetric Standard Model

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