SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 38: Neutrinos, Dark Matter V
T 38.4: Vortrag
Dienstag, 21. März 2023, 17:45–18:00, HSZ/0002
Axion-Photon Coupling Distributions for Non-Minimal DFSZ-type Axion Models — •Johannes Diehl and Emmanouil Koutsangelas — Max Planck Institute for Physics, Munich, Germany
We systematically calculate anomaly ratios and thus axion-photon couplings for non-minimal DFSZ models. This allows us to classify every model and study the resulting distributions to make predictions for axion experiments like haloscopes, helioscopes or light-shining-through-a-wall experiments. Doing so we confirm the experimental importance of the values dictated by the minimal DFSZ models, while also extending the viable axion parameter space. We map this space by introducing a theoretical prior probability distribution for DFSZ-type axions under the assumption of equally probable numbers of Higgs doublets nD ≤ 9 and give 68% and 95% lower bounds on the axion-photon coupling. In contrast to the minimal DFSZ models, there is a large number of non-minimal DFSZ models with domain wall number of unity, thus avoiding the domain wall problem. We find a significantly enhanced axion-photon coupling compared to the minimal DFSZ models, adding to the experimental relevance of this subset.