  Hidden sector photons are a weakly interacting slim particle arising from an
additional U(1) gauge symmetry predicted by many standard model extensions. We
present and demonstrate a new experimental method using a single microwave
cavity to search for hidden sector photons. Only photons with a great enough
energy are able to oscillate into hidden sector photons of a particular mass.
If our cavity is driven on resonance and tuned over the corresponding threshold
frequency, there is an observable drop in the circulating power signifying the
creation of hidden sector photons. This approach avoids the problems of
microwave leakage and frequency matching inherent in photon regeneration
techniques.
