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

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, $\chi <8.06\times 10^{-5}(95$ for $0.04\mathrm{eV}<m_{{\gamma }^{\prime }}<26\mathrm{keV}$.

10 pages, 4 figures

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