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

TL;DR

This study conducted an experimental search for solar hidden photons in the eV energy range using a specialized detector with a parabolic mirror and photomultiplier, but found no evidence and set limits on photon-hidden photon mixing.

Contribution

It introduces a dedicated detector setup for searching solar hidden photons and provides new experimental limits on photon-hidden photon mixing parameters.

Findings

No evidence for solar hidden photons was observed.

Set new upper limits on the photon-hidden photon mixing parameter epending on hidden photon mass.

Demonstrated the effectiveness of the detector setup in the eV energy range.

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 \chi depending on the hidden photon mass m_{\gamma '}.