First results from the CERN Axion Solar Telescope (CAST)

Details First results from the CERN Axion Solar Telescope (CAST) First results from the CERN Axion Solar Telescope (CAST)

2004-11-09

arxiv.org/abs/hep-ex/0411033v2

Phys.Rev.Lett.94:121301,2005

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, accepted by PRL. Final version after the referees comments

Scientific paper

10.1103/PhysRevLett.94.121301

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.

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