Type-III see-saw: Search for triplet fermions in final states with multiple leptons and fat-jets at 13 TeV LHC

Ashanujjaman, Saiyad; Ghosh, Kirtiman

doi:10.1016/j.physletb.2022.136889

Cited by 14 publications

(6 citation statements)

References 42 publications

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“…In these cases, all high-p T objects carry momentum comparable to the masses of N and E ± . For particularly heavy triplets, one also anticipates final-states with boosted topologies [371]. Figure 9: Left: The 95% CL limit with 139 fb −1 of data from ATLAS on triplet lepton masses m N , m L in the dilepton with MET and jets channel [372].…”

Section: Current Atlas and Cms Resultsmentioning

confidence: 99%

“…[370], and varies depending on specific flavor-mixing assumptions. Such sensitivity also holds for many-lepton final states as well as mult-lepton finale states with fat jets, i.e., boosted, hadronically decay W/Z/H bosons [371,398]. However, further studies are needed to investigate the ultimate sensitivity achievable when fully leptonic, semi-leptonic, and fully hadronic channels are combined.…”

Section: Expected Future Atlas and Cms Resultsmentioning

confidence: 99%

See 1 more Smart Citation

The Present and Future Status of Heavy Neutral Leptons

Abdullahi¹,

Alzas²,

Batell³

et al. 2022

Preprint

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Section: Current Atlas and Cms Resultsmentioning

confidence: 99%

Section: Expected Future Atlas and Cms Resultsmentioning

confidence: 99%

The Present and Future Status of Heavy Neutral Leptons

Abdullahi¹,

Alzas²,

Batell³

et al. 2022

Preprint

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“…Therefore, the scalar triplet does not affect leptogenesis.Despite the lack of signatures of Σ beyond 1 TeV at LHC, it is still feasible to explore the triplet fermions in final states that involve multiple leptons and fat-jets. These final states are more refined compared to the typical LHC searches and can be extended up to 10 TeV [79,80]. At 95% confidence level, the ATLAS experiment at LHC has excluded the triplet fermion with mass below 790 GeV [81].…”

Section: Jcap02(2024)041mentioning

confidence: 99%

Low scale leptogenesis in singlet-triplet scotogenic model

Singh,

Mahanta,

Verma

2024

J. Cosmol. Astropart. Phys.

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The scotogenic model presents an elegant and succinct framework for elucidating the origin of tiny neutrino masses within the framework of the Standard Model, employing radiative corrections within the domain of the dark sector. We investigate the possibility of achieving low-scale leptogenesis in the singlet-triplet scotogenic model (STSM), where dark matter mediates neutrino mass generation. We initially considered a scenario involving two moderately hierarchical heavy fermions, N and Σ, wherein the lepton asymmetry is generated by the out-of-equilibrium decay of both particles. Our analysis indicates that the scale of leptogenesis in this scenario is similar to that of standard thermal leptogenesis and is approximately M N,Σ ∼ 109 GeV, which is comparable to the Type-I seesaw case. Further, we consider the case with three heavy fermions (N 2, N 2, and Σ) with the hierarchy M N 1 < M Σ ≪ MM N 2 , which yields the lower bound on heavy fermions up to 3.1 TeV, therefore significantly reduce the scale of the leptogenesis up to TeV scale. The only prerequisite is suppression in the N 1 and Σ Yukawa couplings, which causes suppressed washout effects and a small active neutrino mass of about 10-5 eV. This brings about the fascinating insight that experiments aiming to measure the absolute neutrino mass scale can test low-scale leptogenesis in the scotogenic model. Further, the hyperchargeless scalar triplet Ω provides an additional contribution to mass of the W-boson explaining CDF-II result.

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“…In these cases, all high-p T objects carry momentum comparable to the masses of N and E ± . For particularly heavy triplets, one also anticipates final states with boosted topologies [440].…”

Section: W R mentioning

confidence: 99%

The present and future status of heavy neutral leptons

Abdullahi

Alzás

Batell

et al. 2023

J. Phys. G: Nucl. Part. Phys.

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The existence of nonzero neutrino masses points to the likely existence of multiple Standard Model neutral fermions. When such states are heavy enough that they cannot be produced in oscillations, they are referred to as heavy neutral leptons (HNLs). In this white paper, we discuss the present experimental status of HNLs including colliders, beta decay, accelerators, as well as astrophysical and cosmological impacts. We discuss the importance of continuing to search for HNLs, and its potential impact on our understanding of key fundamental questions, and additionally we outline the future prospects for next-generation future experiments or upcoming accelerator run scenarios.

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Type-III see-saw: Search for triplet fermions in final states with multiple leptons and fat-jets at 13 TeV LHC

Cited by 14 publications

References 42 publications

The Present and Future Status of Heavy Neutral Leptons

The Present and Future Status of Heavy Neutral Leptons

Low scale leptogenesis in singlet-triplet scotogenic model

The present and future status of heavy neutral leptons

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