DFSZ-Type Axions and Where to Find Them

Understand

We systematically calculate the axion-photon coupling for non-minimal DFSZ models.

• Thereby we can classify every calculated model and study the resulting distributions, relevant for axion experiments like haloscopes, helioscopes or light-shining-through-a-wall experiments.
• By adding more than one additional Higgs doublet, these non-minimal DFSZ models extend the viable axion parameter space and lead to a large range of axion-photon couplings.
• We find couplings almost three orders of magnitude larger than the ones of the minimal models.