Results of the CERN Axion Solar Telescope (CAST)

Details Results of the CERN Axion Solar Telescope (CAST) Results of the CERN Axion Solar Telescope (CAST)

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jphcs..65a2009z&link_type=abstract

Journal of Physics: Conference Series, Volume 65, Issue 1, pp. 012009 (2007).

Physics

Scientific paper

We have searched for solar axions or similar particles that couple to two photons by using the 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 ga?? < 8.8 × 10-11 GeV1 at 95% CL for ma < 0.02 eV [2] (see exclusion plot given below). This result is the best laboratory limit over a broad range of axion masses and for ma < 0.02 eV also supersedes the previous limit derived from energy-loss arguments on globularcluster stars. The scanned range up to an axion rest mass of ~0.4 eV/c2 covered during 2005-2006 with 4He (up to 14 mbar) as refractive gas is also shown, while the analysis is in progress. With 3He as buffer gas (up to 60 mbar), CAST has the potential to reach ~0.8 eV/c2, with ~1.2 eV/c2 being the envisaged upper limit in axion rest mass.

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