An improved limit on the axion photon coupling from the CAST experiment
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 gaγ<8.8 × 10-11 GeV-1 at 95% CL for m_{\mathrm {a}} \lesssim 0.02~\mathrm {eV} . This result is the best experimental limit over a broad range of axion masses and for m_{\mathrm {a}} \lesssim 0.02~\mathrm {eV} also supersedes the previous limit derived from energy-loss arguments on globular cluster stars.
- Publication:
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Journal of Cosmology and Astroparticle Physics
- Pub Date:
- April 2007
- DOI:
- arXiv:
- arXiv:hep-ex/0702006
- Bibcode:
- 2007JCAP...04..010A
- Keywords:
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- High Energy Physics - Experiment;
- Astrophysics
- E-Print:
- 24 pages, 8 figures, 1 table, to be submitted to JCAP