Origin of a two-loop neutrino mass from SU(5) grand unification

Saad, Shaikh

doi:10.1103/physrevd.99.115016

Cited by 21 publications

(14 citation statements)

References 69 publications

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“…Hence, we find only two models for genuine radiative neutrino masses in minimal scalar extensions of renormalizable SU (5). Both possibilities have been considered in the literature and it has been shown that they allow for successful unification [22,23]. Extending both the scalar and the fermionic sectors leads to the remaining six models.…”

Section: Discussionmentioning

confidence: 99%

“…This leads to neutrino masses at the two-loop level. Viable solutions for neutrino masses and unification in the SU (5)-completion of S8 have been pointed out previously [23]. There are eight different ways to embed minimal radiative neutrino mass models with an additional fermion into SU (5).…”

Section: Model Scalar Contentmentioning

confidence: 95%

“…(III) (see also Tab. (II) in [23]). In order to test for successful unification in this setup, we generate a set of seven r k -parameters at random and check the conditions (21) and If the conditions are not satisfied, the parameter set is discarded.…”

Section: Unification and Proton Decaymentioning

confidence: 96%

“…Some general considerations concerning gauge coupling unification in radiative neutrinos masses can for example be found in [21]. The embedding of radiative neutrino masses into GUTs in general and minimal renormalisable SU (5) (M RSU (5)) in particular is not a completely new question, see [22] for an example of a SU (5)-symmetric realization of the Zee-model or [23] for a two-loop neutrino mass model. However, a systematic study of possible UV-completions has not been undertaken so far.…”

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confidence: 99%

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Radiative neutrino masses and successful SU(5) unification

Klein

Lindner

2019

Phys. Rev. D

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Minimal SU (5) Grand Unified models predict massless neutrinos and struggle to achieve gauge coupling unification compatible with the observed lower limit on the proton lifetime. Both of these issues can be resolved by embedding minimal radiative neutrino mass models into SU (5). We systematically analyze the possible ways to realize radiative neutrino mass generation in SU (5) and provide a list of the minimal models. We find various models that have not been considered in the literature and demonstrate the compatibility of radiative neutrino masses with gauge coupling unification and proton decay for a new class of models with vector-like fermions. I. INTRODUCTIONGrand-Unified-Theories (GUTs) are an attractive extension of the Standard Model (SM) and provide an elegant completion of the SU (3)×SU (2)×U (1) gauge group of the Standard Model (SM). The simplest model for Grand Unification, the original SU (5) model proposed by Georgi and Glashow [1], is known to exhibit a number of issues that seem to prevent a successful description of the world we observe. Among the most important of these are the inability to account for the observed charged fermion masses, the failure to achieve unification of the gauge couplings, rapid proton decay and the prediction of massless neutrinos. In order to address these issues extensions have been proposed which amend the model in various ways [2][3][4][5][6]. For a classic review of Grand Unified Theories see [7], a more recent overview of GUT phenomenology can be found in [8].One of the simplest extensions is a scalar 45-plet. The 45 contains an additional Standard-Model doublet, the interactions of which lead to additional contributions to the fermion masses and allow for the observed patters of the masses [2]. In addition it has been shown that this model also allows for unification at a scale high enough to suppress the proton decay rate below the observed upper limit from Super-Kamiokande [9]. Nevertheless, the problem that neutrinos are predicted to be massless is not solved in this model.Further extensions of the field content are therefore unavoidable. As is well known from analyses of minimal Standard Model extensions neutrino masses can be generated at tree-level by the type-I, II and III seesaw mechanism [10-16]. The required fields, i.e. complete SM-singlet fermions, scalar or fermionic SU (2) L triplets, can be embedded in SU (5) theories. However, it is also possible that the neutrino masses only arise at loop-level, see for example [17][18][19] for early work in this direction and [20] for a recent review of radiative neutrino mass models. Given that the minimal renormalizable SU (5)

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Section: Discussionmentioning

confidence: 99%

Section: Model Scalar Contentmentioning

confidence: 95%

Section: Unification and Proton Decaymentioning

confidence: 96%

mentioning

confidence: 99%

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Radiative neutrino masses and successful SU(5) unification

Klein

Lindner

2019

Phys. Rev. D

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“…The neutrino mass matrix elements, again, are 20) where m i , i = 1, 2, 3, are neutrino mass eigenstates and U PMNS represents Pontecorvo-Maki-Nakagawa-Sakata (PMNS) unitary mixing matrix. Since we work in the basis where Y d is diagonal and real the unitary matrix that diagonalizes the neutrino matrix must be identified with the PMNS matrix.…”

Section: )mentioning

confidence: 99%

Towards a minimal SU(5) GUT

Doršner

Saad

2020

Phys. Rev. D

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We propose a simple SU (5) model that connects the neutrino mass generation mechanism to the observed disparity between the masses of charged leptons and downtype quarks. The model is built out of 5-, 10-, 15-, 24-, and 35-dimensional representations of SU (5) and comprises two (three) 3 × 3 (3 × 1) Yukawa coupling matrices to accommodate all experimentally measured fermion masses and mixing parameters.The gauge coupling unification considerations, coupled with phenomenological constraints inferred from experiments that probe neutrino masses and mixing parameters and/or look for proton decay, fix all relevant mass scales of the model. The proposed scenario places several multiplets at the scales potentially accessible at the LHC and future colliders and correlates this feature with the gauge boson mediated proton decay signatures. It also predicts that one neutrino is massless. *

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Three-loop inverse scotogenic seesaw models

Abada,

Bernal,

Cárcamo Hernández

et al. 2024

J. High Energ. Phys.

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We propose a class of models providing an explanation of the origin of light neutrino masses, the baryon asymmetry of the Universe via leptogenesis and offering viable dark matter candidates. In these models the Majorana masses of the active neutrino are generated by the inverse seesaw mechanism with the lepton number violating right-handed Majorana neutrino masses μ arising at three loops. The latter is ensured by the preserved discrete symmetries, which also guarantee the stability of the dark matter candidate. We focus on one of these models and perform a detailed analysis of the phenomenology of its leptonic sector. The model can successfully accommodate baryogenesis through leptogenesis in both weak and strong washout regimes. The lightest heavy fermion turns out to be a viable dark matter candidate, provided that the entries of the Majorana submatrix μ are in the keV to MeV range. The solutions are consistent with the experimental constraints, accommodating both mass orderings for active neutrinos, in particular charged-lepton flavor violating decays μ → eγ, μ → eee, and the electron-muon conversion processes get sizable rates within future sensitivity reach.

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Origin of a two-loop neutrino mass from SU(5) grand unification

Cited by 21 publications

References 69 publications

Radiative neutrino masses and successful SU(5) unification

Radiative neutrino masses and successful SU(5) unification

Towards a minimal SU(5) GUT

Three-loop inverse scotogenic seesaw models

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