Search for Dark Photon Dark Matter at 74--159 $μ$eV/c² Using Broadband Cryogenic Receivers

Dark photons are hypothetical massive vector bosons that couple to ordinary photons through kinetic mixing $χ$. Dark photon dark matter (DPDM) converts into photons at a metal surface, with a frequency set by its mass. Using cryogenic K- and Ka-band receivers with a broadband spectrometer, we searched for this signal over 74--159 $μ$eV/c² (18--38.5 GHz) with an integration time of 4.8×10⁵ s per frequency bin. We found no statistically significant signal and set upper limits of $χ<(3.1$--17)×10⁻¹² at the 95% confidence level over 99.8% of the search range, assuming DPDM constitutes all local dark matter. These results improve on previous limits by more than an order of magnitude over most of 74--110 $μ$eV/c² and provide the first direct limits over most of 110--159 $μ$eV/c², approximately two orders of magnitude below cosmological bounds.