Doublet-triplet dark matter with neutrino masses

Abstract

We consider a dark matter (DM) model that arises from the interplay of two renormalizable dark matter models, namely the doublet-triplet fermion model and the doublet-triplet scalar model. Despite being excellent exponents of the WIMP paradigm, the physics related to DM in each of these models fails at the same time to account for neutrino masses. It turns out that from the combination of these two models it is possible to generate neutrino masses at one-loop level in the four topologies that are realizations of the Weinberg operator for neutrino masses at one loop. In this work, we combine both models focusing mostly on fermionic dark matter lying at the electroweak scale. We analyze the impact of the extra charged fields on the Higgs diphoton decay and find that, thanks to the presence of the charged scalars, it is possible to have a viable DM region at the electroweak scale.

One-loop Dirac neutrino mass and mixed axion-WIMP dark matter

“…The stability of electrically neutral particles naturally leads to WIMP scenarios. Among the possible scenarios that may arise (see Tables IV, V and VI) we highlight the ultraviolet fermionic realizations of the Higgs portal [67]: the singlet (via the axion interactions), singlet-doublet and doublet-triplet Dirac DM [68][69][70][71]; and the renormalizable scalar DM models: the singlet scalar DM model [72][73][74], inert doublet model (IDM) [75,76] and inert triplet model [77][78][79], along with the interplays singlet-doublet and doublet triplet [80][81][82][83][84].…”

Phenomenology of doublet-triplet fermionic dark matter in nonstandard cosmology and multicomponent dark sectors

“…The particle spectrum contains three new Majorana mass eigenstates χ 0 α (α = a, b, c) and two new charged fermions χ ± a,b . The mass matrix for the neutral fermions is [38,49]…”

“…IV A) for both spin-independent (SI) and spindependent cross sections. These blind spots for the model has been studied in works such as [38,40,49] • Though the custudial limit scheme presents interesting possibilities, it is also severely constrained by the Higgs diphoton decay measurement. The origin of this is due to the presence of new charged fermions that couple to the Higgs boson and create an effective hγγ coupling through a triangular diagram similar to the top quark contribution (though with a larger electric charge).…”

“…The DM candidate turns out to be a mixture, generated by the interaction with the Higgs boson, between the neutral component of the triplet and the neutral components of the doublet vectorlike fermion. The viable dark matter regions comprise a DM mass around the electroweak scale and above 1 TeV [38][39][40]49]. The electroweak DM region arises in the scheme of the custodial limit (the new Yukawa couplings are equal) when the DM candidate is pure doublet.…”

“…However, the contribution of new the 2 This symmetry can be recognized as remnant symmetry at the end of the symmetry breaking chain of the SO(10) group to the SM [43]. 3 This particle setup has been also considered in studies associated to strengthening the electroweak phase transition [45], presicion test in future colliders [44,46,47], electroweak precision tests [48], generation of neutrino masses [49], fake split-supersymmetry [50], and UV completion of doublet fermion DM [51]. charged fermions to h → γγ generates a considerable suppression on the Higgs diphoton decay making such a scheme severely constrained by the interplay between the DM relic density constraint and the LHC measurement of the Higgs diphoton decay rate [38][39][40]49].…”