Lepton Flavor Violation in the singlet-triplet scotogenic model

Self Cite

Abstract:The scotogenic scenario provides an attractive approach to both Dark Matter and neutrino mass generation, in which the same symmetry that stabilises Dark Matter also ensures the radiative seesaw origin of neutrino mass. However the simplest scenario may suffer from inconsistencies arising from the spontaneous breaking of the underlying Z 2 symmetry. Here we show that the singlet-triplet extension of the simplest model naturally avoids this problem due to the presence of scalar triplets neutral under the Z 2 which affect the evolution of the couplings in the scalar sector. The scenario offers good prospects for direct WIMP Dark Matter detection through the nuclear recoil method.

Section: Summary and Discussionmentioning

confidence: 99%

Consistency of WIMP Dark Matter as radiative neutrino mass messenger

Merle

Platscher

Rojas

et al. 2016

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“…ii) Regarding fermion DM, the lightest eigenvalue χ 0 1 that comes from the mixing between the triplet component Σ 0 and the fermion singlet N is the DM candidate. In this case, we have a interesting phenomenology that comes from the mixing between the singlet and the triplet fermion [9,15,16]. Even more, some important features of this DM candidate are based on its nature itself.…”

Section: Dark Matter Candidatesmentioning

confidence: 99%

“…(LFV) processes, such as l α → l β γ, 3-body decays as µ → 3e, and µ − e conversion in nuclei that imply strong constraints on the parameter space [15]. Also, it was shown that the STFDM model is consistent to high energies.…”

Section: Scalars Fermions Particlementioning

confidence: 99%

“…In this work, we study the full consistency of the STFDM model by performing a comparative analysis of a variety of observables. We find the parameter space that fulfills the relic density [7], the neutrino physics parameters [8], the LFV observables [15], and the direct-indirect searches of DM. Then, we explore the observables at one-loop level as the DM annihilation into two photons (DM DM → γγ) and the SD cross-section for elastic scattering with nucleons with the aim of obtain new DM observables.…”

Section: Scalars Fermions Particlementioning

confidence: 99%

“…Their charge assignment is shown in Table 1. In this work, we follow the notation given in [15,16]. Explicitly, the new fields are,…”

Section: The Stfdm Modelmentioning

confidence: 99%

See 2 more Smart Citations

Phenomenological consistency of the singlet-triplet scotogenic model

Restrepo

Rivera

2020

We perform a complete analysis of the consistency of the singlet-triplet scotogenic model, where both dark matter and neutrino masses can be explained. We determine the parameter space that yields the proper thermal relic density been in agreement with neutrino physics, lepton flavor violation, direct and indirect dark matter searches. In particular, we calculate the dark matter annihilation into two photons, finding that the corresponding cross-section is below the present bounds reported by the Fermi-LAT and H.E.S.S. collaborations. We also determine the spin-dependent cross-section for dark matter elastic scattering with nucleons at one-loop level, finding that the next generation of experiments as LZ and DARWIN could test a small region of the parameter space of the model.

Electric dipole moments in the extended scotogenic models

Fujiwara

Hisano

Kanai

et al. 2021

Electric dipole moments (EDMs) of charged leptons arise from a new source of CP violation in the lepton sector. In this paper, we calculate the EDMs of the charged leptons in the minimal scotogenic model with two singlet fermions, and the models extended with one or two triplet fermions instead of the singlet fermions, taking into account the constraints of the neutrino oscillation data, the charged lepton flavor violation and perturbative unitarity bound for the Yukawa couplings. We show that the hybrid model with one singlet and one triplet fermions predicts an electron EDM larger than the other models in both normal and inverted neutrino mass hierarchy. We find some parameter space has already been ruled out by the current upper bound of the electron EDM and further parameter space can be explored by future experiments.