An experiment of X-ray photon-photon elastic scattering with a Laue-case beam collider
Abstract
We report a search for photon-photon elastic scattering in vacuum in the X-ray region at an energy in the center of mass system of ωcms =6.5 keV for which the QED cross section is σQED =2.5 × 10-47 m2. An X-ray beam provided by the SACLA X-ray Free Electron Laser is split and the two beamlets are made to collide at right angle, with a total integrated luminosity of (1.24 0.08) × 1028 m-2. No signal X rays from the elastic scattering that satisfy the correlation between energy and scattering angle were detected. We obtain a 95% C.L. upper limit for the scattering cross section of 1.9 × 10-27 m2 at ωcms=6.5 keV. The upper limit is the lowest upper limit obtained so far by keV experiments.
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