T. Mizumoto, R. Ohta, T. Horie, J. Suzuki, Y. Inoue, M. Minowa
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 \chi depending on the hidden photon mass m_{\gamma '}. This limit is most stringent in the hidden photon mass region between 10^{-3} and 10^{-1} eV.
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http://arxiv.org/abs/1302.1000
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