PeV Scale Right Handed Neutrino Dark Matter in $S_4$ Flavor Symmetric extra U(1) model

TL;DR

This paper proposes a model where superheavy right-handed neutrinos, stabilized by flavor symmetry breaking, serve as PeV-scale dark matter, explaining high-energy neutrino observations and predicting testable collider signatures.

Contribution

It introduces a novel $S_4$ flavor symmetric model with extra U(1) that naturally produces superheavy right-handed neutrino dark matter and links flavor symmetry breaking to neutrino mass degeneracy.

Findings

Degenerated right-handed neutrino masses enable resonant leptogenesis.

Non-thermal production yields correct dark matter abundance at $T_{RH}\\sim 10$ PeV.

Model predicts testable signatures in collider experiments.

Abstract

Recent observation of high energy neutrino in IceCube experiment suggests existence of superheavy dark matter beyond PeV. We identify the parent particles of neutrino as two degenerated right handed neutrinos, assuming the dark matter is the heaviest right handed neutrino. The $O(V_{cb})\sim O(10^{-2})$ flavor symmetry breaking accounts for the $O(10^{-4})$ mass degeneracy of right handed neutrinos which is a sizable scale to explain the successful resonant leptogenesis at the PeV scale. At the same time, non-thermal production of the heaviest right handed neutrino gives the right amount of dark matter for $T_{RH}\sim 10$PeV. The footprint of flavor symmetry is left in degenerated mass spectra of extra Higgs multiplet and colored Higgs multiplet which may be testable for LHC or future colliders.