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

Journal of Cosmology and Astroparticle Physics · 2007 · Vol. 2007(04) · pp. 010–010

S. Andriamonje✉(CEA Paris-Saclay)S. Aune(Direction des Energies)D. Autiero(European Organization for Nuclear Research)K. Barth(European Organization for Nuclear Research)А. С. Белов(Institute for Nuclear Research)B. Beltrán(Universidad de Zaragoza)H. Bräuninger(Max Planck Institute for Extraterrestrial Physics)J. M. Carmona(Universidad de Zaragoza)S. Cebrián(Universidad de Zaragoza)J. I. Collar(Fermi National Accelerator Laboratory)T. Dafní(CEA Paris-Saclay)M. Davenport(European Organization for Nuclear Research)L. Di Lella(European Organization for Nuclear Research)C. Eleftheriadis(Aristotle University of Thessaloniki)J. Englhauser(Max Planck Institute for Extraterrestrial Physics)G. Fanourakis(National Centre of Scientific Research "Demokritos")E. Ferrer-Ribas(Direction des Energies)H. Fischer(University of Freiburg)J. Franz(University of Freiburg)P. Friedrich(Max Planck Institute for Extraterrestrial Physics)T. Geralis(National Centre of Scientific Research "Demokritos")I. Giomataris(CEA Paris-Saclay)S. Gninenko(Institute for Nuclear Research)H. Gómez(Universidad de Zaragoza)M. Hasinoff(University of British Columbia)F. H. Heinsius(University of Freiburg)D. H. H. Hoffmann(Technical University of Darmstadt)I.G. Irastorza(CEA Paris-Saclay)J. Jacoby(Goethe University Frankfurt)K. Jakovčić(Rudjer Boskovic Institute)D. Kang(University of Freiburg)K. Königsmann(University of Freiburg)R. Kotthaus(Max Planck Institute for Physics)M. Krčmar(Rudjer Boskovic Institute)K. Kousouris(National Centre of Scientific Research "Demokritos")M. Kuster(Technical University of Darmstadt)B. Lakić(Rudjer Boskovic Institute)C. Lasseur(European Organization for Nuclear Research)A. Liolios(Aristotle University of Thessaloniki)A. Ljubičić(Rudjer Boskovic Institute)G. Lutz(Max Planck Institute for Physics)G. Luzón(Universidad de Zaragoza)D W Miller(University of Chicago)A. Morales(Universidad de Zaragoza)J. Morales(Universidad de Zaragoza)A. Ortiz(Universidad de Zaragoza)T. Papaevangelou(European Organization for Nuclear Research)A. Placci(European Organization for Nuclear Research)Georg G. Raffelt(Max Planck Institute for Physics)H. Riege(Technical University of Darmstadt)Alejandro Soto Rodríguez(Universidad de Zaragoza)J. Ruz(Universidad de Zaragoza)I. Savvidis(Aristotle University of Thessaloniki)Yannis K. Semertzidis(University of Patras)Pasquale Dario Serpico(Fermi National Accelerator Laboratory)L. Stewart(European Organization for Nuclear Research)J. D. Vieira(Fermi National Accelerator Laboratory)J.A. Villar(Universidad de Zaragoza)Julia K. Vogel(University of Freiburg)L. Walckiers(European Organization for Nuclear Research)K. Zioutas(University of Patras)

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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) setup 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 8.8 x 10^{-11} GeV^{-1} at 95% CL for m_a <~ 0.02 eV. This result is the best experimental limit over a broad range of axion masses and for m_a <~ 0.02 eV also supersedes the previous limit derived from energy-loss arguments on globular-cluster stars.

Dark Matter and Cosmic Phenomena Particle physics theoretical and experimental studies Cosmology and Gravitation TheoriesPhysicsAxionPhotonLimit (mathematics)Coupling (piping)Particle physicsQuantum electrodynamicsTheoretical physicsNuclear physicsDark matter