Electric dipole moments in the extended scotogenic models

TL;DR

This paper calculates charged lepton electric dipole moments in extended scotogenic models, revealing potential for observable effects and constraining new physics through current and future experiments.

Contribution

It introduces extended scotogenic models with triplet fermions and analyzes their implications for lepton EDMs under experimental constraints.

Findings

Hybrid model predicts larger electron EDM than other models.

Current electron EDM bounds exclude some parameter space.

Future experiments can further test these models.

Abstract

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.