First results from the CERN Axion Solar Telescope (CAST)

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

doi:10.1103/PhysRevLett.94.121301

Article
Report number	hep-ex/0411033
Title	First results from the CERN Axion Solar Telescope (CAST)
Author(s)	Zioutas, K. (Aristotle U., Thessaloniki) ; Andriamonje, S. (DAPNIA, Saclay) ; Arsov, V. (Frankfurt U. ; Darmstadt, Tech. Hochsch.) ; Aune, S. (DAPNIA, Saclay) ; Autiero, D. (CERN) ; Avignone, F.T. (South Carolina U.) ; Barth, K. (CERN) ; Belov, A. (Moscow, INR) ; Beltran, B. (Zaragoza U.) ; Brauninger, H. (Garching, Max Planck Inst., MPE) ; Carmona, J.M. (Zaragoza U.) ; Cebrian, S. (Zaragoza U.) ; Chesi, E. (CERN) ; Collar, J.I. (Chicago U., EFI ; Chicago U., KICP) ; Creswick, R. (South Carolina U.) ; Dafni, T. (Darmstadt, Tech. Hochsch.) ; Davenport, M. (CERN) ; Di Lella, L. (CERN) ; Eleftheriadis, C. (Aristotle U., Thessaloniki) ; Englhauser, J. (Garching, Max Planck Inst., MPE) ; Fanourakis, G. (Democritos Nucl. Res. Ctr.) ; Farach, H. (South Carolina U.) ; Ferrer, E. (DAPNIA, Saclay) ; Fischer, H. (Freiburg U.) ; Franz, J. (Freiburg U.) ; Friedrich, P. (Garching, Max Planck Inst., MPE) ; Geralis, T. (Democritos Nucl. Res. Ctr.) ; Giomataris, I. (DAPNIA, Saclay) ; Gninenko, S. (Moscow, INR) ; Goloubev, N. (Moscow, INR) ; Hasinoff, M.D. (British Columbia U.) ; Heinsius, F.H. (Freiburg U.) ; Hoffmann, D.H.H. (Darmstadt, Tech. Hochsch.) ; Irastorza, I.G. (DAPNIA, Saclay) ; Jacoby, J. (Frankfurt U.) ; Kang, D. (Freiburg U.) ; Konigsmann, K. (Freiburg U.) ; Kotthaus, R. (Munich, Max Planck Inst.) ; Krcmar, M. (Boskovic Inst., Zagreb) ; Kousouris, K. (Democritos Nucl. Res. Ctr.) ; Kuster, M. (Garching, Max Planck Inst., MPE) ; Lakic, B. (Boskovic Inst., Zagreb) ; Lasseur, C. (CERN) ; Liolios, A. (Aristotle U., Thessaloniki) ; Ljubicic, A. (Boskovic Inst., Zagreb) ; Lutz, G. (Munich, Max Planck Inst.) ; Luzon, G. (Zaragoza U.) ; Miller, D.W. (Chicago U., EFI ; Chicago U., KICP) ; Morales, A. (Zaragoza U.) ; Morales, J. (Zaragoza U.) ; Mutterer, M. (Darmstadt, Tech. Hochsch.) ; Nikolaidis, A. (Aristotle U., Thessaloniki) ; Ortiz, A. (Zaragoza U.) ; Papaevangelou, T. (CERN) ; Placci, A. (CERN) ; Raffelt, G. (Munich, Max Planck Inst.) ; Ruz, J. (Zaragoza U.) ; Riege, H. (Darmstadt, Tech. Hochsch.) ; Sarsa, M.L. (Zaragoza U.) ; Savvidis, I. (Aristotle U., Thessaloniki) ; Serber, W. (Munich, Max Planck Inst.) ; Serpico, P. (Munich, Max Planck Inst.) ; Semertzidis, Y. (Darmstadt, Tech. Hochsch.) ; Stewart, L. (CERN) ; Vieira, J.D. (Chicago U., EFI ; Chicago U., KICP) ; Villar, J. (Zaragoza U.) ; Walckiers, L. (CERN) ; Zachariadou, K. (Democritos Nucl. Res. Ctr.)
Publication	2005
Imprint	9 Nov 2004
Number of pages	5
Note	4 pages, accepted by PRL. Final version after the referees comments
In:	Phys. Rev. Lett. 94 (2005) 121301/1-5
DOI	10.1103/PhysRevLett.94.121301
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CAST
Abstract	Hypothetical axion-like 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 LHC test magnet, CAST has been running 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 < 1.16 10^{-10} GeV^-1 at 95% CL for m_a < 0.02 eV. This limit is comparable to the limit from stellar energy-loss arguments and considerably more restrictive than any previous experiment in this axion mass range.

$Panels (a) and (b) show respectively the experimental subtracted spectrum of the TPC data set and MM data set A, together with the expectation for the best fit $g_{a\gamma}$ (lower curve) and for the 95\% CL limit on $g_{a\gamma}$. For (a) the vertical dashed lines indicate the fitting window. The structure at 3 keV in the expected spectrum reflects the change in the efficiency curves due to the Ar K-edge of the detector gas mixtures. Panel (c) shows both the tracking (dots) and background (dashed line) spectra of the CCD data set, together with the expectation (background plus signal) for $g_{a\gamma}$ at its 95\% CL limit, in units of total counts in the restricted CCD area (54.3 mm$^2$) in the tracking exposure time (121.3 h).$ $Panels (a) and (b) show respectively the experimental subtracted spectrum of the TPC data set and MM data set A, together with the expectation for the best fit $g_{a\gamma}$ (lower curve) and for the 95\% CL limit on $g_{a\gamma}$. For (a) the vertical dashed lines indicate the fitting window. The structure at 3 keV in the expected spectrum reflects the change in the efficiency curves due to the Ar K-edge of the detector gas mixtures. Panel (c) shows both the tracking (dots) and background (dashed line) spectra of the CCD data set, together with the expectation (background plus signal) for $g_{a\gamma}$ at its 95\% CL limit, in units of total counts in the restricted CCD area (54.3 mm$^2$) in the tracking exposure time (121.3 h).$ Show more plots

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