Center for Axion and Precision Physics
[Publication on Nature Physics] New CAST limit on the axion-photon interaction
CAPP/IBS 국제공동연구 사업 중 하나인 CAST 팀이 2017월 5월 1일자로 Nature Physics에 논문을 게재함
제목: New CAST limit on the axion-photon interaction
초록: Hypothetical low-mass particles, such as axions, provide a compelling explanation for the dark matter in the universe. Such particles are expected to emerge abundantly from the hot interior of stars. To test this prediction, the CERN Axion Solar Telescope (CAST) uses a 9 T refurbished Large Hadron Collider test magnet directed towards the Sun. In the strong magentic field, solar axions can be converted to X-ray photons which can be recorded by X-ray detectors. In the 2013-2015 run, thanks to low-background detectors and a new X-ray telescope, the signal-to-noise ratio was increased by about a factor of three. Here, we report the best limit on the axion-photon coupling strength (0.66 × 10−10 GeV−1 at 95% confidence level) set by CAST, which now reaches similar levels to the most restrictive astrophysical bounds.
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