A_4-based neutrino masses with Majoron decaying dark matter

TL;DR

This paper introduces an A4 flavor-symmetric model with a spontaneously broken lepton number, proposing a neutrino mass pattern and a Majoron dark matter candidate that decays and produces observable X-ray signals.

Contribution

It presents a novel A4 symmetric seesaw model with a two-zero neutrino mass texture and explores the Majoron as a decaying dark matter candidate with detectable X-ray signatures.

Findings

Neutrino mass and mixing patterns consistent with observations.

Majoron as a viable decaying dark matter candidate.

Predicted X-ray line from Majoron decay detectable by future missions.

Abstract

We propose an A_4 flavor-symmetric SU(3)xSU(2)xU(1) seesaw model where lepton number is broken spontaneously. A consistent two-zero texture pattern of neutrino masses and mixing emerges from the interplay of type-I and type-II seesaw contributions, with important phenomenological predictions. We show that, if the Majoron becomes massive, such seesaw scenario provides a viable candidate for decaying dark matter, consistent with cosmic microwave background lifetime constraints that follow from current WMAP observations. We also calculate the sub-leading one-loop-induced decay into photons which leads to a mono-energetic emission line that may be observed in future X-ray missions such as Xenia.