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 Friedrich; T Geralis; I Giomataris; S Gninenko; H Gómez; M Hasinoff; F H Heinsius; D H H Hoffmann; I G Irastorza; J Jacoby; K Jakovčić; 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 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; (CAST Collaboration)

doi:10.1088/1475-7516/2007/04/010

Journal of Cosmology and Astroparticle Physics

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

S Andriamonje¹, S Aune¹, D Autiero², K Barth², A Belov³, B Beltrán⁴, H Bräuninger⁵, J M Carmona⁴, S Cebrián⁴, J I Collar⁶, T Dafni^1,7, M Davenport², L Di Lella², C Eleftheriadis⁸, J Englhauser⁵, G Fanourakis⁹, E Ferrer Ribas¹, H Fischer¹⁰, J Franz¹⁰, P Friedrich⁵, T Geralis⁹, I Giomataris¹, S Gninenko³, H Gómez⁴, M Hasinoff¹¹, F H Heinsius¹⁰, D H H Hoffmann^7,12, I G Irastorza^1,4, J Jacoby¹³, K Jakovčić¹⁴, D Kang¹⁰, K Königsmann¹⁰, R Kotthaus¹⁵, M Krčmar¹⁴, K Kousouris⁹, M Kuster^5,7, B Lakić¹⁴, C Lasseur², A Liolios⁸, A Ljubičić¹⁴, G Lutz¹⁵, G Luzón⁴, D Miller⁶, A Morales⁴, J Morales⁴, A Ortiz⁴, T Papaevangelou², A Placci², G Raffelt¹⁵, H Riege⁷, A Rodríguez⁴, J Ruz⁴, I Savvidis⁸, Y Semertzidis¹⁶, P Serpico¹⁷, L Stewart², J Vieira⁶, J Villar⁴, J Vogel¹⁰, L Walckiers², K Zioutas^2,16 and (CAST Collaboration)

Published 17 April 2007 • IOP Publishing Ltd
Journal of Cosmology and Astroparticle Physics, Volume 2007, April 2007 Citation S Andriamonje et al JCAP04(2007)010 DOI 10.1088/1475-7516/2007/04/010

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¹ DAPNIA, Centre d'Études Nucléaires de Saclay, Gif-sur-Yvette, France

² European Organization for Nuclear Research (CERN), CH-1211 Genève 23, Switzerland

³ Institute for Nuclear Research, Russian Academy of Sciences, Moscow, Russia

⁴ Instituto de Física Nuclear y Altas Energías, Universidad de Zaragoza, Zaragoza, Spain

⁵ Max-Planck-Institut für extraterrestrische Physik, Geissenbachstrasse, D-85748 Garching, Germany

⁶ Enrico Fermi Institute and KICP, University of Chicago, Chicago, IL, USA

⁷ Technische Universität Darmstadt, Institut für Kernphysik, Schlossgartenstrasse 9, D-64289 Darmstadt, Germany

⁸ Aristotle University of Thessaloniki, Thessaloniki, Greece

⁹ National Center for Scientific Research 'Demokritos', Athens, Greece

¹⁰ Albert-Ludwigs-Universität Freiburg, Freiburg, Germany

¹¹ Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada

¹² Gesellschaft für Schwerionenforschung, GSI-Darmstadt, Plasmaphysik, Planckstrasse 1, D-64291 Darmstadt, Germany

¹³ Johann Wolfgang Goethe-Universität, Institut für Angewandte Physik, Frankfurt am Main, Germany

¹⁴ Rudjer Bošković Institute, Bijenička cesta 54, PO Box 180, HR-10002 Zagreb, Croatia

¹⁵ Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Föhringer Ring 6, D-80805 München, Germany

¹⁶ University of Patras, Patras, Greece

¹⁷ Particle Astrophysics Center—Fermi National Accelerator Laboratory, Batavia, IL 60510, USA

¹⁸ Present address: Institut de Physique Nucléaire, Lyon, France

¹⁹ Present address: Department of Physics, Queen's University, Kingston, ON, K7L 3N6, Canada

²⁰ Present address: Scuola Normale Superiore, Pisa, Italy

²¹ Permanent address: Brookhaven National Laboratory, NY, USA

²² On leave

²³ Deceased

Dates

Received 7 February 2007
Accepted 23 March 2007
Published 17 April 2007

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Abstract

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_aγ<8.8 × 10⁻¹¹ GeV⁻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.

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