Top quark and Higgs boson masses in supersymmetric models

We consider two distinct classes of Yukawa unified supersymmetric SO(10) models with non-universal and universal soft supersymmetry breaking (SSB) gaugino masses at M GUT . In both cases, we assume that the third family SSB sfermion masses at M GUT are different from the corresponding sfermion masses of the first two families (which are equal). For the SO(10) model with essentially arbitrary (non-universal) gaugino masses at M GUT , it is shown that t-b-τ Yukawa coupling unification is compatible, among other things, with the 125 GeV Higgs boson mass, the WMAP relic dark matter density, and with the resolution of the apparent muon g − 2 anomaly. The colored sparticles in this case all turn out to be quite heavy, of order 5 TeV or more, but the sleptons (smuon and stau) can be very light, of order 200 GeV or so. For the SO(10) model with universal gaugino masses and NUHM2 boundary conditions, the muon g − 2 anomaly cannot be resolved. However, the gluino in this class of models is not too heavy, 3 TeV, and therefore may be found at the LHC.

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“…(For a recent discussion regarding the top quark mass and related issues in low scale supersymmetric models, see ref. [29])…”

Section: Introductionmentioning

confidence: 99%

Split sfermion families, Yukawa unification and muon g − 2

Ajaib

Gogoladze

Shafi

et al. 2014

J. High Energ. Phys.

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“…where m~t is the stop mass and m t ¼ 173.3 GeV is the top quark mass [39,40]. Note that our results are not too sensitive to variation in the value of m t within 1σ-2σ [41].…”

Section: Scanning Procedures and Experimental Constraintsmentioning

confidence: 88%

Stop on top: SUSY parameter regions and fine-tuning constraints

Demir¹,

Ün

2014

Phys. Rev. D

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We analyze minimal supersymmetric models in order to determine in what parameter regions with what amount of fine-tuning they are capable of accommodating the LHC-allowed top-stop degeneracy window. The stops must be light enough to enable Higgs naturalness yet heavy enough to induce a 125 GeV Higgs boson mass. These two constraints imply a large mass splitting. By an elaborate scan of the parameter space, we show that the stop-on-top scenario requires at least Δ CMSSM ≃ Oð10 4 Þ fine-tuning in the constrained minimal supersymmetric Standard Model (CMSSM). By relaxing the CMSSM parameter space with nonuniversal Higgs masses, we find that Δ NUHM1 ≃ Oð10 4 Þ. The CMSSM with a gravitino lightest supersymmetric particle works slightly better than the nonuniversal Higgs mass model. Compared to all these, the CMSSM with μ < 0 and nonuniversal gauginos yields a much smaller fine-tuning Δ μ;g ≃ Oð100Þ. Our results show that the gaugino sector can pave the road toward a more natural stop-ontop scenario.

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“…Hu , successful REWSB was achieved for the case of non-universal gaugino masses [47,55], while the old arguments for the universal gaugino mass case are reiterated. On the other hand, successful REWSB was found for the case of CMSSM with µ < 0 in [46], albeit with only approximate Yukawa unification due to their bottom-up approach of running Yukawa parameters.…”

Section: Humentioning

confidence: 99%

Comparatively light extra Higgs states as signature of SUSY SO(10) GUTs with 3rd family Yukawa unification

Antusch

Hohl

Susic

2020

J. High Energ. Phys.

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We study 3rd family Yukawa unification in the context of supersymmetric (SUSY) SO(10) GUTs and SO(10)-motivated boundary conditions for the SUSY-breaking soft terms. We consider µ < 0 such that the SUSY loop-threshold effects enable a good fit to all third family masses of the charged Standard Model (SM) fermions. We find that fitting the third family masses together with the mass of the SM-like Higgs particle, the scenario predicts the masses of the superpartner particles and of the extra Higgs states of the MSSM: while the sparticles are predicted to be comparatively heavy (above the present LHC bound but within reach of future colliders), the spectrum has the characteristic feature that the lightest new particles are the extra MSSM Higgses. We show that this effect is rather robust with respect to many deformations of the GUT boundary conditions, but turns out to be sensitive to the exactness of top-bottom Yukawa unification. Nevertheless, with moderate deviations of a few percent from exact top-bottom Yukawa unification (stemming e.g. from GUT-threshold corrections or higher-dimensional operators), the scenario still predicts extra MSSM Higgs particles with masses not much above 1.5 TeV, which could be tested e.g. by future LHC searches for ditau decays H 0 /A 0 → τ τ . Finding the extra MSSM Higges before the other new MSSM particles could thus be a smoking gun for a Yukawa unified SO(10) GUT.

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Top quark and Higgs boson masses in supersymmetric models

Cited by 7 publications

References 62 publications

Split sfermion families, Yukawa unification and muon g − 2

Split sfermion families, Yukawa unification and muon g − 2

Stop on top: SUSY parameter regions and fine-tuning constraints

Comparatively light extra Higgs states as signature of SUSY SO(10) GUTs with 3rd family Yukawa unification

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