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The hidden sector photon is a weakly interacting hypothetical particle withsub-eV mass that kinetically mixes with the photon. We describe a microwavefrequency light shining through a wall experiment where a cryogenic resonantmicrowave cavity is used to try and detect photons that have passed through animpenetrable barrier, a process only possible via mixing with hidden sectorphotons. For a hidden sector photon mass of 53 $\mu$eV we limit the hiddenphoton kinetic mixing parameter $\chi < 1.7\times10^{-7}$, which is an order ofmagnitude lower than previous bounds derived from cavity experiments in thesame mass range. In addition, we use the cryogenic detector cavity to place newlimits on the kinetic mixing parameter for hidden sector photons as a form ofcold dark matter.

Cryogenic resonant microwave cavity searches for hidden sector photons