Light Stops and Fine-Tuning in MSSM

Cici, Ali; Kırca, Zerrin; Ün, Cem Salih

doi:10.48550/arxiv.1611.05270

Cited by 3 publications

(3 citation statements)

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“…In order to be consistent with the measured mass of the Higgs boson at the LHC, we require either a heavy stop, or large SSB trilinear scalar coupling or a suitable combination of the two. Large SSB trilinear scalar coupling, however, leads to higher fine-tuning [32].…”

Section: Sparticle Mass Spectrum and Fine-tuningmentioning

confidence: 99%

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

2017

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A wide variety of unified models predict asymptotic relations at M GU T between the b quark and τ lepton Yukawa couplings. Within the framework of supersymmetric SU(4) × SU(2) L × SU(2) R , we explore regions of the parameter space that are compatible with b-τ quasi-Yukawa unification and the higgsinos being the lightest supersymmetric particles ( 1 TeV). Among the colored sparticles, the stop weighs more than 1.5 TeV or so, whereas the squarks of the first two families are signifcantly heavier, approaching 10 TeV in some cases. The gluino mass is estimated to lie in the 2-4 TeV range which raises the important question: Will the LHC find the gluino?

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Section: Sparticle Mass Spectrum and Fine-tuningmentioning

confidence: 99%

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

2017

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“…First we present the stop and sbottom masses in Figure 5 middle and right panels, if the charged Higgs boson is allowed to be heavy enough, there is a possibility for the decay process H ± → tb . However, since the relevant background generated by the decay processes involving with the top-quark significantly suppresses the possible signals from stop [62], such decays of the charged Higgs boson may not provide a detectable track.…”

Section: Fundamental Parameter Space and Mass Spectrummentioning

confidence: 99%

Charged Higgs in MSSM and Beyond

Hicyilmaz,

Selbuz,

Solmaz

et al. 2017

Preprint

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We conduct a numerical study over the constrained MSSM (CMSSM), Next-to-MSSM (NMSSM) and U (1) extended MSSM (UMSSM) to probe the allowed mass ranges of the charged Higgs boson and its dominant decay patterns, which might come into prominence in near future collider experiments. We present results obtained from a limited scan for CMSSM as a basis and compare its predictions with the extended models. We observe within our data that a wide mass range is allowed as 0.5( 1) m H ± 17 TeV in UMSSM (NMSSM). We find that the dominant decay channel is mostly H ± → tb such that BR(H ± → tb) ∼ 80%. While this mode remains dominant over the whole allowed parameter space of CMSSM, we realize some special domains in the NMSSM and UMSSM, in which BR(H ± → tb) 10%. In this context, the decay patterns of the charged Higgs can play a significant role to distinguish among the SUSY models. In addition to the tb decay mode, we find that the narrow mass scale in CMSSM allows only the decay modes for the charged Higgs boson to τ ν (∼ 16%), and their supersymmetric partners τ ν (∼ 13%). On the other hand, it is possible to realize the mode in NMSSM and UMSSM in which the charged Higgs boson decays into a chargino and neutralino pair up to about 25%. This decay mode requires non-universal boundary conditions within the MSSM framework to be available, since CMSSM yields BR(H ± → χ0 1 χ± 1 ) 1%. It can also be probed in near future collider experiments through the missing energy and CP-violation measurements. Moreover, the chargino mass is realized as m χ± 1 1 TeV in NMSSM and UMSSM, and these solutions will be likely tested soon in collider experiments through the chargino-neutralino production. Focusing on the chargino-neutralino decay patterns, we also present tables which list the possible ranges for the charged Higgs production and decay modes.

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“…particular GUT scale models such as CMSSM or gauge-mediated SUSY are in-deed fine-tuned [9][10][11][12] . However, this is no longer true if we consider a less constrained SUSY extension of the SM [13][14][15][16][17].…”

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confidence: 99%

Supersymmetry with dark matter is still natural

et al. 2017

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We identify the parameter regions of the phenomenological minimal supersymmetric standard model (pMSSM) with the minimal possible fine-tuning. We show that the fine-tuning of the pMSSM is not large, nor under pressure by LHC searches. Low sbottom, stop and gluino masses turn out to be less relevant for low fine-tuning than commonly assumed. We show a link between low fine-tuning and the dark matter relic density. Fine-tuning arguments point to models with a dark matter candidate yielding the correct dark matter relic density: a bino-higgsino particle with a mass of 35 − 155 GeV. Some of these candidates are compatible with recent hints seen in astrophysics experiments such as Fermi-LAT and AMS-02. We argue that upcoming direct search experiments, such as XENON1T, will test all of the most natural solutions in the next few years due to the sensitivity of these experiments on the spin-dependent WIMP-nucleon cross section.It is expected that the Standard Model of particle physics (SM) is only an effective theory that needs to be complemented at higher energies. The problem of extending the SM arises in the high sensitivity of the Higgs potential to the mass scale of new physics. If this scale largely exceeds the electroweak scale we generally have the socalled fine-tuning (FT) problem: a huge degree of cancellation is needed between the tree-level mass and the independent quantum corrections to match the measured Higgs boson mass [1]. For many years supersymmetry (SUSY) [2] with particles at the TeV scale was regarded to be the most natural solution to the FT problem due to a cancellation of fermionic and bosonic contributions to the quantum corrections [3,4]. Furthermore, SUSY is motivated as providing the most general space-time symmetry, a unification of coupling constants and a starting point to solve the shortcomings of the SM. In addition, R-parity conserving SUSY provides through the lightest neutralino (χ 0 1 ) one of the best weakly interacting massive particle (WIMP) candidates for dark matter (DM). Within the ΛCDM model, Planck measurements of the cosmic microwave background yield a value for the dark matter relic density: Ω DM,Planck h 2 = 0.1186 ± 0.0011 [5]. Due to the null results at the various collider and DM experiments, there is a growing current of opinion that SUSY is just another beautiful idea that didn't pan out. The main argument is that SUSY particles already need to be so heavy, that SUSY itself requires a significant amount of FT to reproduce the electroweak scale correctly, making the theory unnatural independent of the FT measure used [6][7][8]. One must realize that this statement is framework dependent, e.g. particular GUT scale models such as CMSSM or gauge-mediated SUSY are indeed fine-tuned [9][10][11][12] . However, this is no longer true if we consider a less constrained SUSY extension of the SM [13][14][15][16][17]. In this paper we re-evaluate the FT of SUSY by looking at the minimal SUSY extension of the SM (MSSM), restricted to the phenomenologically most relevant soft SUSY ...

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Light Stops and Fine-Tuning in MSSM

Cited by 3 publications

References 0 publications

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

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

Charged Higgs in MSSM and Beyond

Supersymmetry with dark matter is still natural

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