Interplay between Resonant Leptogenesis, Neutrinoless Double Beta Decay and Collider Signals in a Model with Flavor and CP Symmetries

TL;DR

This paper explores a low-scale seesaw model with flavor and CP symmetries that links neutrino properties, leptogenesis, and experimental signals across collider and neutrinoless double beta decay experiments.

Contribution

It introduces a model connecting low-energy neutrino CP phases with high-energy leptogenesis, predicting collider and decay signals based on neutrino mass ordering.

Findings

Degenerate right-handed neutrinos enable resonant leptogenesis.

Normal neutrino mass ordering enhances collider signals.

Inverted ordering favors neutrinoless double beta decay detection.

Abstract

We present a low-scale type-I seesaw scenario with discrete flavor and CP symmetries. This scenario not only explains the measured values of the lepton mixing angles, but also makes predictions for leptonic CP violation, and connects the low-energy CP phases relevant for neutrino oscillation and neutrinoless double beta decay experiments with the high-energy CP phases relevant for leptogenesis. We show that the three right-handed Majorana neutrinos in this scenario have (almost) degenerate masses and their decays can explain the observed baryon asymmetry of the Universe via resonant leptogenesis. We study the correlation of the predicted baryon asymmetry with lepton-number-violating signals at high-energy colliders, including both prompt and displaced vertex/long-lived signatures, as well as in low-energy neutrinoless double beta decay experiments. We find that the normal ordering of light neutrino masses leads to an enhanced collider signal, whereas the neutrinoless double beta decay provides a promising probe in the inverted ordering case.