Neutrino mass hierarchy from the discrete dark matter model

2023/02/16 by Cesar Bonilla, Johannes Herms, Bonilla, Cesar +5
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #Neutrino Physics Research

paper · pdf · doi:10.48550/arxiv.2302.08514

Abstract

We explore a possible explanation for the hierarchy in scale between the atmospheric and solar neutrino mass differences (| Δm²₃₁ |, and Δm²₂₁) through the presence of two distinct neutrino mass mechanisms from tree- and one-loop-level contributions. We demonstrate that the ingredients needed to explain this hierarchy are present in the minimal discrete dark matter model [arXiv:2301.10811]. This scenario is characterized by adding new RH neutrinos and scalar SU(2) doublets to the Standard Model as triplet representations of an A₄ flavour symmetry. The A₄ symmetry breaking, which occurs at the electroweak scale, leads to a residual ℤ₂ symmetry responsible for the dark matter stability and dictates the neutrino phenomenology. We show that CP breaking in the scalar potential is needed to fit the neutrino mixing angles.

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