Phys. Rev. Lett.
94,
121301
(2005)
[5 pages]
First Results from the CERN Axion Solar Telescope
K. Zioutas et al. CAST Collaboration
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K. Zioutas8, S. Andriamonje2, V. Arsov13,4, S. Aune2, D. Autiero1,*, F. T. Avignone3, K. Barth1, A. Belov11, B. Beltrán6, H. Bräuninger5, J. M. Carmona6, S. Cebrián6, E. Chesi1, J. I. Collar7, R. Creswick3, T. Dafni4, M. Davenport1, L. Di Lella1,†, C. Eleftheriadis8, J. Englhauser5, G. Fanourakis9, H. Farach3, E. Ferrer2, H. Fischer10, J. Franz10, P. Friedrich5, T. Geralis9, I. Giomataris2, S. Gninenko11, N. Goloubev11, M. D. Hasinoff12, F. H. Heinsius10, D. H. H. Hoffmann4, I. G. Irastorza2, J. Jacoby13, D. Kang10, K. Königsmann10, R. Kotthaus14, M. Krčmar15, K. Kousouris9, M. Kuster5, B. Lakić15, C. Lasseur1, A. Liolios8, A. Ljubičić15, G. Lutz14, G. Luzón6, D. W. Miller7, A. Morales6,‡, J. Morales6, M. Mutterer4, A. Nikolaidis8, A. Ortiz6, T. Papaevangelou1, A. Placci1, G. Raffelt14, J. Ruz6, H. Riege4, M. L. Sarsa6, I. Savvidis8, W. Serber14, P. Serpico14, Y. Semertzidis4,§, L. Stewart1, J. D. Vieira7, J. Villar6, L. Walckiers1, and K. Zachariadou9 (CAST Collaboration)
1European Organization for Nuclear Research (CERN), Genève, Switzerland
2DAPNIA, Centre d’Études Nucléaires de Saclay (CEA-Saclay), Gif-sur-Yvette, France
3Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina, USA
4GSI-Darmstadt and Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany
5Max-Planck-Institut für Extraterrestrische Physik, Garching, Germany
6Instituto de Física Nuclear y Altas Energías, Universidad de Zaragoza, Zaragoza, Spain
7Enrico Fermi Institute and KICP, University of Chicago, Chicago, Illinois, USA
8Aristotle University of Thessaloniki, Thessaloniki, Greece
9National Center for Scientific Research “Demokritos,” Athens, Greece
10Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
11Institute for Nuclear Research (INR), Russian Academy of Sciences, Moscow, Russia
12Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada
13Johann Wolfgang Goethe-Universität, Institut für Angewandte Physik, Frankfurt am Main, Germany
14Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Munich, Germany
15Rudjer Bošković Institute, Zagreb, Croatia
Received 31 October 2004; published 1 April 2005
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 axion-photon coupling gaγ<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.
© 2005 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.121301
DOI:
10.1103/PhysRevLett.94.121301
PACS:
95.35.+d, 14.80.Mz, 96.60.Vg
*Present address: Institut de Physique Nucléaire, Lyon, France. †Present address: Scuola Normale Superiore, Pisa, Italy. ‡Deceased. §Permanent address: Brookhaven National Laboratory, NY, USA.
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