Extended IDM theory with low scale seesaw mechanisms

TL;DR

This paper proposes an extended inert doublet model that explains fermion masses, dark matter stability, and CP violation through multi-loop radiative mechanisms, also addressing the CMS 95 GeV diphoton excess.

Contribution

It introduces a novel low-scale seesaw framework with radiative mass generation and multi-component dark matter, linking several phenomena in particle physics.

Findings

Successfully accounts for SM fermion masses and mixings

Reproduces dark matter relic abundance compatible with experiments

Explains the CMS 95 GeV diphoton excess

Abstract

We have developed an extension of the inert doublet model in which the CP-phases in the weak sector are generated from one-loop level corrections mediated by dark fields, while the strong-CP phase arises at three-loop. In this framework, the tiny masses of the active neutrinos are produced through a radiative inverse seesaw mechanism at a two-loop level, the masses of the first and second families of SM-charged fermions arise from a one-loop level radiative seesaw mechanism, and the third generation of SM charged fermion masses are generated at tree level. We have demonstrated that the proposed model successfully accounts for SM fermion masses and mixings. The radiative nature of the seesaw mechanisms is attributed to preserved discrete symmetries, which are required for ensuring the stability of fermionic and scalar dark matter candidates. The preserved discrete symmetries also allow for multi-component dark matter, whose annihilation processes permits to successfully reproduce the measured amount of dark matter relic abundance for an appropriate region of parameter space, which has shown to be compatible with current dark matter direct detection limits. Besides that, we explore the model's ability to explain the $95$ GeV diphoton excess observed by the CMS collaboration, showing that it readily accommodates this anomaly. We have shown that charged lepton flavor violating decays acquire rates within the current experimental sensitivity.