Type III seesaw under $$A_4$$ modular symmetry with leptogenesis

Mishra, Priya; Behera, Mitesh Kumar; Panda, Papia; Mohanta, Rukmani

doi:10.1140/epjc/s10052-022-11074-6

Cited by 9 publications

(2 citation statements)

References 120 publications

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“…In order to have successful leptogenesis, in Type-I and Type-II seesaw extensions, the heavy singlet fermion and scalar triplet, respectively, contribute to the overall lepton asymmetry which further can be converted to baryon asymmetry via sphaleron processes [7][8][9][10][11][12][13][14][15]. The phenomena of leptogenesis in various extensions of the SM has been discussed thoroughly in the literature [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. The standard thermal leptogenesis based on Type-I seesaw model has a limitation of requiring very heavy Majorana fermions [36][37][38][39].…”

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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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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“…Hence, A 4 symmetry and U(1) B−L symmetries are broken at a significantly high scale than the electroweak symmetry-breaking scale. Table (3) provides the A 4 charges and modular weights for the added particles with elaborated discussion present in original work [88]. The purpose of incorporating extra U(1) B−L symmetry is to avoid undesirable terms in the superpotential, which cannot be prevented by A 4 modular symmetry alone.…”

Section: Jhep09(2023)144mentioning

confidence: 99%

Exploring models with modular symmetry in neutrino oscillation experiments

Mishra,

Behera,

Panda

et al. 2023

J. High Energ. Phys.

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Our study aims to investigate the viability of neutrino mass models that arise from discrete non-Abelian modular symmetry groups, i.e., ΓN with (N = 1, 2, 3, . . . ) in the future neutrino experiments T2HK, DUNE, and JUNO. Modular symmetry reduces the usage of flavon fields compared to the conventional discrete flavor symmetry models. Theories based on modular symmetries predict the values of leptonic mixing parameters, and therefore, these models can be tested in future neutrino experiments. In this study, we consider three models based on the A4 modular symmetry, i.e., Model-A, B, and C such a way that they predict different values of the oscillation parameters but still allowed with respect to the current data. In the future, it is expected that T2HK, DUNE, and JUNO will measure the neutrino oscillation parameters very precisely, and therefore, some of these models can be excluded in the future by these experiments. We have estimated the prediction of these models numerically and then used them as input to scrutinize these models in the neutrino experiments. Assuming the future best-fit values of θ23 and δCP remain the same as the current one, our results show that at 5σ C.L, Model-A can be excluded by T2HK whereas Model-B can be excluded by both T2HK and DUNE. Model-C cannot be excluded by T2HK and DUNE at 5σ C.L. Further; our results show that JUNO alone can exclude Model-B at an extremely high confidence level if the future best-fit of θ12 remains at the current-one. We have also identified the region in the θ23 - δCP parameter space, for which Model-A cannot be separated from Model-B in T2HK and DUNE.

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Minimal seesaw and leptogenesis with the smallest modular finite group

Marciano,

Meloni,

Parriciatu

2024

J. High Energ. Phys.

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We propose a model for leptons based on the smallest modular finite group Γ2 ≅ S3 that, for the first time, accounts for both the hints of large low-energy CP-violation in the lepton sector and the matter-antimatter asymmetry of the Universe, generated by only two heavy right-handed neutrinos. These same states are also employed in a Minimal seesaw mechanism to generate light neutrino masses. Besides the heavy neutrinos, our particle content is the same as the Standard Model (SM), with the addition of one single modulus τ, whose vacuum expectation value is responsible for both the modular and CP-symmetry breakings. We show that this minimalistic SM extension is enough to get an excellent fit to low energy neutrino observables and to the required baryon asymmetry ηB. Predictions for the neutrino mass ordering, effective masses in neutrinoless double beta decay and tritium decay as well as for the Majorana phases are also provided.

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Type III seesaw under $$A_4$$ modular symmetry with leptogenesis

Abstract: We make an attempt to study neutrino phenomenology in the framework of type-III seesaw by considering $$A_4$$ A 4 modular symmetry in the super-symmetric context. In addition, we have included a local $$U(1)_{B-L}$$ U ( 1 ) … Show more

Cited by 9 publications

References 120 publications

Low scale leptogenesis in singlet-triplet scotogenic model

Low scale leptogenesis in singlet-triplet scotogenic model

Exploring models with modular symmetry in neutrino oscillation experiments

Minimal seesaw and leptogenesis with the smallest modular finite group

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