Search for 70 μeV Dark Photon Dark Matter with a Dielectrically-Loaded Multi-Wavelength Microwave Cavity

Abstract

Microwave cavities have been deployed to search for bosonic dark matter candidates with masses of a few $\hat{I}¼$eV. However, the sensitivity of these cavity detectors is limited by their volume, and the traditionally-employed half-wavelength cavities suffer from a significant volume reduction at higher masses. ADMX-Orpheus mitigates this issue by operating a tunable, dielectrically-loaded cavity at a higher-order mode, which allows the detection volume to remain large. The ADMX-Orpheus inaugural run excludes dark photon dark matter with kinetic mixing angle $\ddot{I}‡>10^{-13}$ between 65.5 $\hat{I}¼$eV (15.8 GHz) and 69.3 $\hat{I}¼$eV (16.8GHz), marking the highest-frequency tunable microwave cavity dark matter search to date.

7 pages, 5 figure, to be submitted to PRL