$A_4$ symmetry at colliders and in the universe

Abstract

Two puzzling facts of our time are the observed patterns in the fermion masses and mixings and the existence of non-baryonic dark matter, which are both often associated with extensions of the Standard Model at higher energy scales. In this paper, we consider a solution to these two problems with the flavour symmetry ${\mathbb{A}}_4\times {\mathbb{Z}}_2\times {\mathbb{Z}}_2^{\prime }$, in a model which has been shown before to explain large leptonic mixings with a specific texture. The model contains 3 generations of $SU(2{)}_L$-doublet scalar fields, arranged as an ${\mathbb{A}}_4$-triplet, that spontaneously break the electroweak symmetry, and a "dark sector" of ${\mathbb{Z}}_2$-odd fields, containing one Majorana neutrino and an ${\mathbb{A}}_4$-triplet $SU(2{)}_L$-doublet scalar field, the lightest of which provides a candidate for dark matter. Concerning the ${\mathbb{Z}}_2$-even scalar fields, compared to the Standard Model, we predict additional fields with masses at the electroweak scale. We therefore investigate present phenomenological constraints from lepton flavour violation experiments, obtaining a lower bound on the extra scalar masses of 140 GeV. Furthermore we consider the oblique parameters, Higgs boson decay properties and possible flavour violating signals at the LHC. Concerning the "dark sector", we study bounds from dark matter search experiments and identify the parameter space of the dark matter candidate that is compatible with the observed relic density. We find two allowed mass ranges for the dark matter within which the experimental constraints can be accommodated: the low-mass range is from 47 GeV to 74 GeV and the high-mass range is from 600 GeV and 3.6 TeV.

v2, to be published in JHEP

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