Abstract
We explore the connection between Dark Matter and neutrinos in a model inspired by radiative Type-II seessaw and scotogenic scenarios. In our model, we introduce new electroweakly charged states (scalars and a vector-like fermion) and impose a discrete ℤ2 symmetry. Neutrino masses are generated at the loop level and the lightest ℤ2-odd neutral particle is stable and it can play the role of a Dark Matter candidate. We perform a numerical analysis of the model showing that neutrino masses and flavour structure can be reproduced in addition to the correct dark matter density, with viable DM masses from 700 GeV to 30 TeV. We explore direct and indirect detection signatures and show interesting detection prospects by CTA, Darwin and KM3Net and highlight the complementarity between these observables.
Highlights
The presence of Dark Matter (DM) and its role in the formation of large scale structures of the universe [1] altogether with the observation of neutrino oscillations [2,3,4,5,6,7] are some of the strongest indications that the Standard Model (SM) of particle physics lacks essential ingredients
We investigated the phenomenology of a model that provides a Dark Matter candidate and a mechanism to generate neutrino masses using as inspiration the fields in the Type-II seesaw
We introduced, in addition to the SM fields, a pair of SU(2)L scalar triplets with hypercharge Y = 1 and Y = 0 and a SU(2)L doublet vectorlike fermion
Summary
The presence of Dark Matter (DM) and its role in the formation of large scale structures of the universe [1] altogether with the observation of neutrino oscillations [2,3,4,5,6,7] are some of the strongest indications that the Standard Model (SM) of particle physics lacks essential ingredients. 2 units of lepton number, which is broken spontaneously once this scalar acquires a nonvanishing vacuum-expectation-value (vev), generating subsequently neutrino mass terms proportional to this vev Beyond this framework, non-vanishing neutrino masses can be generated at the loop level, providing an additional argument to justify the large hierarchy between the electroweak scale and the light neutrino masses. We highlight the models known as “scotogenic” , in which, the Weinberg operator is generated at one-loop by using as basis the Type-I [18] or Type-III [19] seesaw BSM fields which are, in this case, charged under the new symmetry Constructions combining both models present interesting DM and neutrino phenomenology (for instance [20,21,22,23]).
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