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Hebbar, Aditya; Leontaris, G.K.; Shafi, Qaisar

doi:10.1103/physrevd.93.111701

Cited by 12 publications

(12 citation statements)

References 67 publications

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“…The prediction of VLQs is not exclusive to the model under consideration. In fact, the existence of such states has been predicted by a series of distinct models in previous literature, such as in E 6 -inspired string and GUT models [40,41] or in other extensions to the SM [42,43]. However, unlike VLLs, from an experimental point-of-view, there is also a good history of searches, in particular, at the LHC (see, for example, [44][45][46]), where the current constraints on parameter space constrain the VLQ masses to be between 690 GeV up to 1.85 TeV (for current constraints, as of March 2021, see the summary plots in [47]).…”

Section: Dimension-full Dimensionlessmentioning

confidence: 90%

Collider signatures of vector-like fermions from a flavor symmetric model

Bonilla

Hernández

Gonçalves

et al. 2022

J. High Energ. Phys.

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We propose a model with two Higgs doublets and several SU(2) scalar singlets with a global non-Abelian flavor symmetry $$ {\mathcal{Q}}_6\times {\mathcal{Z}}_2 $$ Q 6 × Z 2 . This discrete group accounts for the observed pattern of fermion masses and mixing angles after spontaneous symmetry breaking. In this scenario only the third generation of fermions get their masses as in the Standard Model (SM). The masses of the remaining fermions are generated through a seesaw-like mechanism. To that end, the matter content of the model is enlarged by introducing electrically charged vector-like fermions (VLFs), right handed Majorana neutrinos and several SM scalar singlets. Here we study the processes involving VLFs that are within the reach of the Large Hadron Collider (LHC). We perform collider studies for vector-like leptons (VLLs) and vector-like quarks (VLQs), focusing on double production channels for both cases, while for VLLs single production topologies are also included. Utilizing genetic algorithms for neural network optimization, we determine the statistical significance for a hypothetical discovery at future LHC runs. In particular, we show that we can not safely exclude VLLs for masses greater than 200 GeV. For VLQ’s in our model, we show that we can probe their masses up to 3.8 TeV, if we take only into account the high-luminosity phase of the LHC. Considering Run-III luminosities, we can also exclude VLQs for masses up to 3.4 TeV. We also show how the model with predicted VLL masses accommodates the muon anomalous magnetic moment.

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Section: Dimension-full Dimensionlessmentioning

confidence: 90%

Collider signatures of vector-like fermions from a flavor symmetric model

Bonilla

Hernández

Gonçalves

et al. 2022

J. High Energ. Phys.

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show abstract

“…The prediction of VLQs is not exclusive to the model under consideration. In fact, the existence of such states has been predicted by a series of distinct models in previous literature, such as in E 6 -inspired string and GUT models [35,36] or in other extensions to the SM [37,38]. However, unlike VLLs, from an experimental point-of-view, there is also a good history of searches, in particular, at the LHC (see, for example, [39][40][41]), where the current constraints on parameter space constrain the VLQ masses to be between 690 GeV up to 1.85 TeV (for current constraints, as of March 2021, see the summary plots in [42]).…”

Section: Dimension-full Dimensionlessmentioning

confidence: 90%

Collider signatures of vector-like fermions from a flavor symmetric model

Bonilla,

Hernández,

Gonçalves

et al. 2021

Preprint

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We propose a 2-Higgs doublet model (2HDM) with a global non-Abelian flavor symmetry Q6 × Z2. This discrete group accounts for the observed pattern of fermion masses and mixing angles after spontaneous symmetry breaking. In this scenario only the third generation of fermions get their masses as in the Standard Model (SM). The masses of the remaining fermions are generated through a seesaw-like mechanism. To that end, the matter content of the 2HDM is enlarged by introducing electrically charged vector-like fermions (VLFs), right handed Majorana neutrinos and several SM scalar singlets. Here we study the processes involving VLFs that are within the reach of the Large Hadron Collider (LHC). We perform collider studies for vector-like leptons (VLLs) and vector-like quarks (VLQs), focusing on double production channels for both cases, while for VLLs single production topologies are also included. Utilizing genetic algorithms for neural network optimization, we determine the statistical significance for a hypothetical discovery at future LHC runs. In particular, we show that we can not safely exclude VLLs for masses greater than 200 GeV. For VLQ's in our model, we show that we can probe their masses up to 5.2 TeV, if we take only into account the high-luminosity phase of the LHC. Considering Run-III luminosities, we can also exclude VLQs for masses up to 4 TeV. We also show how the model with predicted VLL masses accommodates the muon anomalous magnetic moment.

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“…[25, 35-37, 50, 55, 61, 62]. Alternative setups to improve fits have also been tried, such as splitting the Aterms [63], considering 4 Higgs doublets instead of 2 [64], introducing certain extra vector-like fermions motivated by an E 6 GUT context [65], or introducing an entire vector-like family of SM fermions [66].…”

Section: Experimental Constraints and Considerationsmentioning

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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Masses of third family vectorlike quarks and leptons in Yukawa-unifiedE6

Cited by 12 publications

References 67 publications

Collider signatures of vector-like fermions from a flavor symmetric model

Collider signatures of vector-like fermions from a flavor symmetric model

Collider signatures of vector-like fermions from a flavor symmetric model

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

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