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Recently, the PVLAS collaboration has reported an anomalously large rotationof the polarization of light in the presence of a magnetic field. As a possibleexplanation they consider the existence of a light pseudoscalar particlecoupled to two photons. In this note, we propose a method of independentlytesting this result by using a high-energy photon regeneration experiment (theX-ray analogue of "invisible light shining through walls") using thesynchrotron X-rays from a free-electron laser (FEL). With such an experimentthe region of parameter space implied by PVLAS could be probed in a matter ofminutes.Comment: 3 pages, 2 figure

Photon Regeneration from Pseudoscalars at X-Ray Laser Facilities