Results of a Search for Paraphotons with Intense X-ray Beams at SPring-8

TL;DR

This paper reports a search for paraphotons using intense X-ray beams at SPring-8, employing the 'Light Shining through a Wall' method, resulting in new constraints on photon-paraphoton mixing angles within a specific mass range.

Contribution

First application of the 'Light Shining through a Wall' technique with X-ray beams at SPring-8 to set limits on paraphoton properties.

Findings

No excess events observed above background

Established upper limit on mixing angle $ heta < 8.06 imes 10^{-5}$

Constrained paraphoton mass range from 0.04 eV to 26 keV

Abstract

A search for paraphotons, or hidden U(1) gauge bosons, is performed using an intense X-ray beamline at SPring--8. "Light Shining through a Wall" technique is used in this search. No excess of events above background is observed. A stringent constraint is obtained on the photon--paraphoton mixing angle, $\chi < 8.06\times 10^{-5}\ (95%\ {\rm C.L.})$ for $0.04\ {\rm eV}<m_{\gamma^{\prime}} < 26\ {\rm keV}$.