An improved limit on the axion-photon coupling from the CAST experiment

S. Andriamonje, S. Aune, D. Autiero, K. Barth, A. Belov, B. Beltrán, H. Bräuninger, J. M. Carmona, S. Cebrián, J. I. Collar, T. Dafni, M. Davenport, L. Di Lella, C. Eleftheriadis, J. Englhauser, G. Fanourakis, E. Ferrer Ribas, H. Fischer, J. Franz, P. FriedrichT. Geralis, I. Giomataris, S. Gninenko, H. Gómez, M. Hasinoff, F. H. Heinsius, D. H.H. Hoffmann, I. G. Irastorza, J. Jacoby, K. Jaković, D. Kang, K. Königsmann, R. Kotthaus, M. Krmar, K. Kousouris, M. Kuster, B. Lakić, C. Lasseur, A. Liolios, A. Ljubiić, G. Lutz, G. Luzón, D. Miller, A. Morales, J. Morales, A. Ortiz, T. Papaevangelou, A. Placci, G. Raffelt, H. Riege, A. Rodríguez, J. Ruz, I. Savvidis, Y. Semertzidis, P. Serpico, L. Stewart, J. Vieira, J. Villar, J. Vogel, L. Walckiers, K. Zioutas

Research output: Contribution to journalArticlepeer-review


We have searched for solar axions or similar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) set-up with improved conditions in all detectors. From the absence of excess x-rays when the magnet was pointing to the Sun, we set an upper limit on the axion-photon coupling of g<8.8 × 10-11GeV-1 at 95% CL for . This result is the best experimental limit over a broad range of axion masses and for also supersedes the previous limit derived from energy-loss arguments on globular cluster stars.

Original languageEnglish (US)
Article number010
JournalJournal of Cosmology and Astroparticle Physics
Issue number4
StatePublished - Apr 1 2007
Externally publishedYes


  • Axions
  • Magnetic fields

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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