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.
This coupling reads as −L ⊃cν ∂µa 4vs ¯νγµγ5ν.(21) Here the coefficientcν is one for the KSVZ models, while for the DFSZ models it is function oftanβ=vu/vd
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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.