Light Higgsinos, heavy gluino, and 
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 quasi-Yukawa unification: Prospects for finding the gluino at the LHC

Hebbar, Aditya; Shafi, Qaisar; Ün, Cem Salih

doi:10.1103/physrevd.95.115026

Cited by 7 publications

(3 citation statements)

References 96 publications

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“…The Minimal Supersymmetric extension of the SM (MSSM) offers solutions to many of these shortcomings, with substantial implications for dark matter , the cosmic matter-antimatter asymmetry [41][42][43], Higgs physics [44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60], the unification of gauge forces [61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76], the stability of the electroweak vacuum [77][78][79][80], cosmological inflation [81][82][83][84][85][86][87][88][89]…”

Section: Introductionmentioning

confidence: 99%

Global fits of GUT-scale SUSY models with GAMBIT

Athron¹,

Balázs²,

Bringmann³

et al. 2017

Eur. Phys. J. C

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: Introductionmentioning

confidence: 99%

Global fits of GUT-scale SUSY models with GAMBIT

Athron¹,

Balázs²,

Bringmann³

et al. 2017

Eur. Phys. J. C

103

126

View full text Add to dashboard Cite

show abstract

“…Even though the framework can be extended in the QYU case, it is still minimalistic since only one extra representation for the Higgs fields (with those from (15,1,3) [9]) is allowed. However, if the framework is extended to include other possible Higgs representations, the MSSM Higgs fields become linear superpositions of those from these representations, and the Yukawa couplings can receive different contributions depending on the vertices between the relevant matter and Higgs fields [13].…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the extra Higgs fields, the presence of higher dimensional operators also contribute to the Yukawa couplings such that the top quark Yukawa coupling can receive a significant correction from such operators [14], and its deviation from YU cannot be restricted within t − b − τ QYU. In this context, the unification scheme can be identified as b − τ QYU [15].…”

Section: Introductionmentioning

confidence: 99%

Muon g−2 in an alternative quasi-Yukawa unification with a less fine-tuned seesaw mechanism

2018

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We explore the low-scale implications of the Pati-Salam Model including the TeV scale right-handed neutrinos interacting and mixing with the MSSM fields through the inverse seesaw (IS) mechanism in light of the muon anomalous magnetic moment (muon g − 2) resolution and highlight the solutions which are compatible with the quasi-Yukawa unification condition (QYU). We find that the presence of the righthanded neutrinos causes heavy smuons as mμ ≳ 800 GeV in order to avoid tachyonic staus at the low scale. On the other hand, the sneutrinos can be as light as about 100 GeV, and along with the light charginos of mass ≲400 GeV, they can yield such large contributions to muon g − 2 that the discrepancy between the experiment and the theory can be resolved. These solutions also require m˜χAE We also discuss such light chargino and neutralino along with the light stau (mτ ≳ 200 GeV) in the light of current LHC results. Besides, the gluino mass lies in a range ∼½2.5-3.5 TeV, which is tested in near future experiments. In addition, the model predicts relatively light Higgsinos (μ ≲ 700 GeV); hence, the second chargino mass is also light enough (≲700 GeV) to contribute to muon g − 2. Light Higgsinos also yield less fine-tuning at the electroweak scale, and the regions compatible with muon g − 2 restrict Δ EW ≲ 100 strictly, and this region also satisfies the QYU condition. In addition, the ratios among the Yukawa couplings should be 1.8 ≲ y t /y b ≲ 2.6, y τ /y b ∼ 1.3 to yield correct fermion masses. Even though the righthanded neutrino Yukawa coupling can be varied freely, the solutions bound its range to 0.8 ≲ y ν /y b ≲ 1.7.

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What hadron collider is required to discover or falsify natural supersymmetry?

et al. 2017

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Weak scale supersymmetry (SUSY) remains a compelling extension of the Standard Model because it stabilizes the quantum corrections to the Higgs and W, Z boson masses. In natural SUSY models these corrections are, by definition, never much larger than the corresponding masses. Natural SUSY models all have an upper limit on the gluino mass, too high to lead to observable signals even at the high luminosity LHC. However, in models with gaugino mass unification, the wino is sufficiently light that supersymmetry discovery is possible in other channels over the entire natural SUSY parameter space with no worse than 3% fine-tuning. Here, we examine the SUSY reach in more general models with and without gaugino mass unification (specifically, natural generalized mirage mediation), and show that the high energy LHC (HE-LHC), a pp collider with √ s = 33 TeV, will be able to detect the SUSY signal over the entire allowed mass range. Thus, HE-LHC would either discover or conclusively falsify natural SUSY with better than 3% fine-tuning using a conservative measure that allows for correlations among the model parameters.

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Light Higgsinos, heavy gluino, and b−τ quasi-Yukawa unification: Prospects for finding the gluino at the LHC

Cited by 7 publications

References 96 publications

Global fits of GUT-scale SUSY models with GAMBIT

Global fits of GUT-scale SUSY models with GAMBIT

Muon g−2 in an alternative quasi-Yukawa unification with a less fine-tuned seesaw mechanism

What hadron collider is required to discover or falsify natural supersymmetry?

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