Search for chameleons with CAST

V. Anastassopoulos, M. Arik, S. Aune, K. Barth, A. Belov, H. Bräuninger, G. Cantatore, J. M. Carmona, S. A. Cetin, Finn Erland Christensen, J. I. Collar, Anders Clemen Jakobsen

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In this work we present a search for (solar) chameleons with the CERN Axion Solar Telescope (CAST). This novel experimental technique, in the field of dark energy research, exploits both the chameleon coupling to matter (βm) and to photons (βΥ) via the Primako eect. By reducing the X-ray detection energy threshold used for axions from 1 keV to 400 eV CAST became sensitive to the converted solar chameleon spectrum which peaks around 600 eV. Even though we have not observed any excess above background, we can provide a 95% C.L. limit for the coupling strength of chameleons to photons of βΥ≤1011 for 1 < βm < 106.
Original languageEnglish
JournalPhysics Letters B: Particle Physics, Nuclear Physics and Cosmology
Pages (from-to)172–180
Publication statusPublished - 2015

Bibliographical note

©2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license


  • Chameleon
  • CAST
  • SDD
  • X-ray
  • Tachocline
  • Dark energy

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