Axion Paradigm with Color-Mediated Neutrino Masses

TL;DR

This paper introduces a new axion model involving colored fermions and scalars that generate neutrino masses via two-loop processes, addressing the strong CP problem and providing testable predictions for axion detection.

Contribution

It presents a generalized axion framework with colored mediators for neutrino masses, linking axion phenomenology with neutrino physics and dark matter.

Findings

Proposes a two-loop Majorana neutrino mass mechanism mediated by colored particles.

Connects axion properties with neutrino mass generation and dark matter production.

Suggests experimental probes via axion-to-photon coupling measurements.

Abstract

We propose a generalized Kim-Shifman-Vainshtein-Zakharov-type axion framework in which colored fermions and scalars act as two-loop Majorana neutrino-mass mediators. The global Peccei-Quinn symmetry under which exotic fermions are charged solves the strong CP problem. Within our general proposal, various setups can be distinguished by probing the axion-to-photon coupling at helioscopes and haloscopes. We also comment on axion dark-matter production in the early Universe.