New CAST limit on the axion–photon interaction

By V. Anastassopoulos, S. Aune, K. Barth, A. Belov, H. Bräuninger, G. Cantatore, J. Carmona, J. Castel, S. Cetin, F. Christensen and 56 more. Nature Physics, 2017

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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 magnetic 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. Axions are hypothetical light particles that could explain the dark matter. They could be produced in the interior of the Sun and the CERN Axion Solar Telescope sets the best limit on how strongly axions can interact with light.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/daedf7852c92238bcf62460405246ba9e750acf0

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Citations in the corpus

The landscape of QCD axion models (2020, background): “They correspond to the 2017 CAST results [420], to the ADMX limit [296, 373, 500–502], to the constraints from hot DM (HDM) [503] and from horizontal branch (HB) stars [361].”
Stellar recipes for axion hunters (2017, background): “1 The IAXO helioscope The helioscope is a particularly interesting experimental setup that has already shown the capability to effectively probe axion parameters close to those required to explain the anomalous cooling of stars [108].”