Minimal Models for Axion and Neutrino

TL;DR

This paper explores minimal models linking the Peccei-Quinn mechanism and the seesaw mechanism for neutrino masses, predicting axion properties that can be tested in future dark matter experiments.

Contribution

It introduces various minimal PQ seesaw models extending the Standard Model, providing new benchmark predictions for axion couplings compared to traditional models.

Findings

Different models predict distinct axion-photon-photon couplings.

Models relate the PQ symmetry breaking scale to the neutrino mass scale.

Predictions can be tested in upcoming axion dark matter searches.

Abstract

The PQ mechanism resolving the strong CP problem and the seesaw mechanism explaining the smallness of neutrino masses may be related in a way that the PQ symmetry breaking scale and the seesaw scale arise from a common origin. Depending on how the PQ symmetry and the seesaw mechanism are realized, one has different predictions on the color and electromagnetic anomalies which could be tested in the future axion dark matter search experiments. Motivated by this, we construct various PQ seesaw models which are minimally extended from the (non-) supersymmetric Standard Model and thus set up different benchmark points on the axion-photon-photon coupling in comparison with the standard KSVZ and DFSZ models.