We propose a Standard Model extension with underlying A4 flavour symmetry where small Dirac neutrino masses arise from a Type-II seesaw mechanism. The model predicts the "golden" flavourdependent bottom-tau mass relation, requires an inverted neutrino mass ordering and non-maximal atmospheric mixing angle. Using the latest neutrino oscillation global fit [1] we derive restrictions on the oscillation parameters, such as a correlation between δCP and mν
In this paper, we study the viability of having a fermion Dark Matter particle below the TeV mass scale in connection to the neutrino mass generation mechanism. The simplest realisation is achieved within the scotogenic model where neutrino masses are generated at the 1-loop level. Hence, we consider the case where the dark matter particle is the lightest 2 -odd Majorana fermion running in the neutrino mass loop. We assume that lepton number is broken dynamically due to a lepton number carrier scalar singlet which acquires a non-zero vacuum expectation value. In the present scenario the Dark Matter particles can annihilate via t-and s-channels. The latter arises from the mixing between the new scalar singlet and the Higgs doublet. We identify three different Dark Matter mass regions below 1 TeV that can account for the right amount of dark matter abundance in agreement with current experimental constraints. We compute the Dark Matter-nucleon spin-independent scattering crosssection and find that the model predicts spin-independent cross-sections 'naturally' dwelling below the current limit on direct detection searches of Dark Matter particles reported by XENON1T. c 2Theoretically, it is very tempting to think that the DM sector and neutrino mass generation mechanism are linked. This connection appears naturally when the neutrino masses are generated at the loop level [14]. In such scenarios, the smallness of the neutrino masses is due to a loop suppression and the additional particles carry a non-trivial charge under an unbroken symmetry which is responsible for DM stability. The simplest idea in this regard is the so-called Scotogenic model [14], where the neutrino masses are generated at the 1-loop level. In this OPEN ACCESS RECEIVED
In this paper we present a scenario where the stability of dark matter and the phenomenology of neutrinos are related by the spontaneous breaking of a non-Abelian flavor symmetry (A 4 ). In this scenario the breaking is done at the seesaw scale, in such a way that what remains of the flavor symmetry is a Z 2 symmetry, which stabilizes the dark matter. We have proposed two models based on this idea, for which we have calculated their neutrino mass matrices achieving two-zero texture in both cases. Accordingly, we have updated this two-zero texture phenomenology finding an interesting correlation between the reactor mixing angle and the sum of the light neutrino masses.We also have a correlation between the lightest neutrino mass and the neutrinoless double beta decay effective mass, obtaining a lower bound for the effective mass within the region of the nearly future experimental sensitivities.
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