title: Photon regeneration experiment for axion search using x-rays.
abstract: In this Letter we describe our novel photon regeneration experiment for the axionlike particle search using an x-ray beam with a photon energy of 50.2 and 90.7 keV, two superconducting magnets of 3 T, and a Ge detector with a high quantum efficiency. A counting rate of regenerated photons compatible with zero has been measured. The corresponding limits on the pseudoscalar axionlike particle-two-photon coupling constant is obtained as a function of the particle mass. Our setup widens the energy window of purely terrestrial experiments devoted to the axionlike particle search by coupling to two photons. It also opens a new domain of experimental investigation of photon propagation in magnetic fields.
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses (UPR 3228, CNRS-INSA-UJF-UPS), F-31400 Toulouse Cedex, France, EU. remy.battesti@lncmi.cnrs.fr
authors.forename: R
authors.initials: R
authors.lastname: Battesti
authors.forename: M
authors.initials: M
authors.lastname: Fouché
authors.forename: C
authors.initials: C
authors.lastname: Detlefs
authors.forename: T
authors.initials: T
authors.lastname: Roth
authors.forename: P
authors.initials: P
authors.lastname: Berceau
authors.forename: F
authors.initials: F
authors.lastname: Duc
authors.forename: P
authors.initials: P
authors.lastname: Frings
authors.forename: G L J A
authors.initials: GL
authors.lastname: Rikken
authors.forename: C
authors.initials: C
authors.lastname: Rizzo