If the QCD axion and neutrino masses share a single symmetry-breaking scale, the axion necessarily couples to neutrinos and can decay into a monochromatic neutrino signal.
Massive neutrinos and invisible axion minimally connected
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abstract
We survey a few minimal scalar extensions of the standard electroweak model that provide a simple setup for massive neutrinos in connection with an invisible axion. The presence of a chiral $U(1)$ \`a la Peccei-Quinn drives the pattern of Majorana neutrino masses while providing a dynamical solution to the strong CP problem and an axion as a dark matter candidate. We paradigmatically apply such a renormalizable framework to type-II seesaw and to two viable models for neutrino oscillations where the neutrino masses arise at one and two loops, respectively. We comment on the naturalness of the effective setups as well as on their implications for vacuum stability and electroweak baryogenesis.
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The QCD Axion and Neutrino Masses
If the QCD axion and neutrino masses share a single symmetry-breaking scale, the axion necessarily couples to neutrinos and can decay into a monochromatic neutrino signal.