Abstract
The CERN Axion Solar Telescope (CAST) has extended its search for solar axions by using He3 as a buffer gas. At T=1.8K this allows for larger pressure settings and hence sensitivity to higher axion masses than our previous measurements with He4. With about 1 h of data taking at each of 252 different pressure settings we have scanned the axion mass range 0.39eVm a0.64eV. From the absence of excess x rays when the magnet was pointing to the Sun we set a typical upper limit on the axion-photon coupling of g aγ2.3×10 -10GeV -1 at 95% C.L., the exact value depending on the pressure setting. Kim-Shifman-Vainshtein-Zakharov axions are excluded at the upper end of our mass range, the first time ever for any solar axion search. In the future we will extend our search to m a1.15eV, comfortably overlapping with cosmological hot dark matter bounds. Published by the American Physical Society under the terms of the http://creativecommons.org/licenses/by/3.0/Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
| Original language | English |
|---|---|
| Article number | 261302 |
| Journal | Physical Review Letters |
| Volume | 107 |
| Issue number | 26 |
| DOIs | |
| State | Published - 23 Dec 2011 |
| Externally published | Yes |
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