Experimental search for solar hidden photons in the eV energy range using kinetic mixing with photons

Abstract

We have searched for solar hidden photons in the eV energy range using a dedicated hidden photon detector. The detector consisted of a parabolic mirror with a diameter of 500mm and a focal length of 1007mm installed in a vacuum chamber, and a photomultiplier tube at its focal point. The detector was attached to the Tokyo axion helioscope, Sumico which has a mechanism to track the sun. From the result of the measurement, we found no evidence for the existence of hidden photons and set a limit on the photon-hidden photon mixing parameter χdepending on the hidden photon mass m_{γ'}.

11 pages, 4 figures. To be submitted to JCAP. Added fig.2. Added references to some recent theoretical developments. Added results of new references to the exclusion plot(fig.5). Our results remain unchanged