First results from the CERN axion solar telescope

K. Zioutas, S. Andriamonje, V. Arsov, S. Aune, D. Autiero, F. T. Avignone, K. Barth, A. Belov, B. Beltrán, H. Bräuninger, J. M. Carmona, S. Cebrián, E. Chesi, J. I. Collar, R. Creswick, T. Dafni, M. Davenport, L. Di Lella, C. Eleftheriadis, J. EnglhauserG. Fanourakis, H. Farach, E. Ferrer, H. Fischer, J. Franz, P. Friedrich, T. Geralis, I. Giomataris, S. Gninenko, N. Goloubev, M. D. Hasinoff, F. H. Heinsius, D. H.H. Hoffmann, G. Irastorza, J. Jacoby, D. Kang, K. Königsmann, R. Kotthaus, M. Krčmar, K. Kousouris, M. Kuster, B. Lakić, C. Lasseur, A. Liolios, A. Ljubičić, G. Lutz, G. Luzón, D. W. Miller, A. Morales, J. Morales, M. Mutterer, A. Nikolaidis, A. Ortiz, T. Papaevangelou, A. Placci, G. Raffelt, J. Ruz, H. Riege, M. L. Sarsa, I. Savvidis, W. Serber, P. Serpico, Y. Semertzidis, L. Stewart, J. D. Vieira, J. Villar, L. Walckiers, K. Zachariadou

Research output: Contribution to journalArticlepeer-review


Hypothetical axionlike particles with a two-photon interaction would be produced in the sun by the Primakoff process. In a laboratory magnetic field ("axion helioscope"), they would be transformed into x-rays with energies of a few keV. Using a decommissioned Large Hadron Collider test magnet, the CERN Axion Solar Telescope ran for about 6 months during 2003. The first results from the analysis of these data are presented here. No signal above background was observed, implying an upper limit to the axionphoton coupling g < 1.16 × 10-10 GeV-1 at 95% C.L. for ma ≲ 0.02 eV. This limit, assumption-free, is comparable to the limit from stellar energy-loss arguments and considerably more restrictive than any previous experiment over a broad range of axion masses.

Original languageEnglish (US)
Article number121301
JournalPhysical review letters
Issue number12
StatePublished - Apr 1 2005
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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