Exclusion of ALP Cogenesis Dark Matter in a Mass Window Above 100 $\mu$eV

We report the results of Phase 1b of The ORGAN Experiment, a microwave cavity haloscope searching for dark matter axions in the $107.42-111.93\mu$eV mass range. The search excludes axions with two-photon coupling $g_{a\gamma \gamma }\ge 4\times {10}^{-12}{\text{GeV}}^{-1}$ with $95\mathrm{\%}$ confidence interval, setting the best upper bound to date and with the required sensitivity to exclude the axion-like particle cogenesis model for dark matter in this range. This result was achieved using a tunable rectangular cavity, which mitigated several practical issues that become apparent when conducting high mass axion searches, and was the first such axion search to be conducted with such a cavity. It also represents the most sensitive axion haloscope experiment to date in the $\sim 100\mu$eV mass region.