Search for Dark Photon Dark Matter in the Mass Range 41--74 $\mu\mathrm{eV}$ using Millimeter-Wave Receiver and Radioshielding Box

TL;DR

This study searched for dark photon dark matter in the 41--74 μeV mass range using a millimeter-wave receiver within a radioshielding box, setting new upper limits on the kinetic mixing parameter after no detection.

Contribution

First experimental search for dark photon dark matter in the 41--74 μeV range using millimeter-wave detection and radioshielding, establishing new upper limits on the coupling constant.

Findings

No detection of conversion photons in the 10--18 GHz range.

Set upper limits on the kinetic mixing parameter, χ < (0.5--3.9) × 10^{-10}.

Constrained the parameter space for dark photon dark matter.

Abstract

Dark photons have been considered potential candidates for dark matter. The dark photon dark matter (DPDM) has a mass and interacts with electromagnetic fields via kinetic mixing with a coupling constant of $\chi$. Thus, DPDMs are converted into ordinary photons at metal surfaces. Using a millimeter-wave receiver set in a radioshielding box, we performed experiments to detect the conversion photons from the DPDM in the frequency range 10--18 GHz, which corresponds to a mass range 41--74 $\mu\mathrm{eV}$. We found no conversion photon signal in this range and set the upper limits to $\chi < (0.5\text{--}3.9) \times 10^{-10}$ at a 95% confidence level.