A modular A 4 symmetric scotogenic model for neutrino mass and dark matter

2021 ◽  
Author(s):  
Mitesh Kumar Behera ◽  
Shivaramakrishna Singirala ◽  
Subhasmita Mishra ◽  
R Mohanta
Keyword(s):  
Dark Matter ◽  
Neutrino Mass ◽  
Dirac Fermion ◽  
Dark Matter Candidate ◽  
Parameter Region ◽  
Mass Generation ◽  
Neutrino Mass Generation ◽  
Consistent Parameter ◽  
Radiative Mechanism ◽  
Lepton Flavour

Abstract Modular symmetries have been impeccable in neutrino and quark sectors. This motivated us, to propose a variant of scotogenic model based on modular $A_4$ symmetry and realize the neutrino mass generation at one-loop level through radiative mechanism. Alongside, we discuss the lepton flavour violating processes $\mu \to e \gamma$, $\mu \to3e$ and $\mu - e $ conversion in the nucleus. The lightest Dirac fermion turns out to be potential dark matter candidate, made stable by suitable assignment of modular weights. The relic density of the same has been computed with annihilations mediated by inert scalars and new $U(1)$ gauge boson. The LEP-II and ATLAS dilepton constraints on the new gauge parameters are suitably considered to show the consistent parameter region.

scholarly journals Low scale leptogenesis in a model with promising CP structure

2021 ◽  
Vol 81 (4) ◽  
Author(s):  
Daijiro Suematsu
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Resonance Effect ◽  
Low Energy ◽  
Simple Extension ◽  
Dark Matter Candidate ◽  
Mass Generation ◽  
Leptonic Sector ◽  
The Standard Model ◽  
Neutrino Mass Generation

AbstractWe consider a simple extension of the standard model, which could give a solution to itsCPissues through both the Peccei–Quinn mechanism and the Nelson–Barr mechanism. Its low energy effective model coincides with the scotogenic model in the leptonic sector. Although leptogenesis is known not to work well at lower reheating temperature than$$10^9$$109 GeV in simple seesaw and scotogenic frameworks, such low reheating temperature could be consistent with both neutrino mass generation and thermal leptogenesis via newly introduced fields without referring to the resonance effect. An alternative dark matter candidate to axion is prepared as an indispensable ingredient of the model.

scholarly journals Probing the dark matter of a three-loop radiative neutrino mass generation model with the Cherenkov Telescope Array

2021 ◽  
Vol 103 (3) ◽  
Author(s):  
Talal Ahmed Chowdhury ◽  
Saquib Hassan ◽  
Jahid Hossain ◽  
Salah Nasri ◽  
Mahmud Ashraf Shamim
Keyword(s):  
Dark Matter ◽  
Neutrino Mass ◽  
Generation Model ◽  
Mass Generation ◽  
Telescope Array ◽  
Cherenkov Telescope ◽  
Neutrino Mass Generation

Radiative neutrino mass generation: Models, flavour and the LHC

2017 ◽  
Vol 32 (14) ◽  
pp. 1742001
Author(s):  
Raymond R. Volkas
Keyword(s):  
Neutrino Mass ◽  
Lepton Number ◽  
Mass Generation ◽  
Low Energies ◽  
Mass Dimension ◽  
Flavour Violation ◽  
Neutrino Mass Generation ◽  
Neutrino Mass Models ◽  
Lepton Flavour

Radiative neutrino mass models and the seesaw models are viewed from the unifying framework of standard model effective operators that explicitly violate lepton number by two units [Formula: see text]. After some comments on naturalness and leptogenesis in the minimal type 1 seesaw model, a full list of minimal renormalisable models that produce mass dimension-7, [Formula: see text] operators at low energies is presented. By way of example, phenomenological bounds from Run 1 LHC and lepton flavour violation data are then placed on one of these models. A possible connection between radiative neutrino mass models and the current flavour anomalies in [Formula: see text] and [Formula: see text] transitions is then described.

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