Search for dark photon dark matter in the mass range 41-74 eV using millimeter-wave receiver and radioshielding box

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 eV. We found no conversion photon signal in this range and set the upper limits to chi < (0.5-3.9) x 10(-10) at a 95% confidence level.