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A new upper limit on the axion-photon coupling with an extended CAST run with a Xe-based Micromegas detector
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abstract
Hypothetical axions provide a compelling explanation for dark matter and could be emitted from the hot solar interior. The CERN Axion Solar Telescope (CAST) has been searching for solar axions via their back conversion to X-ray photons in a 9-T 10-m long magnet directed towards the Sun. We report on an extended run with the IAXO (International Axion Observatory) pathfinder detector, doubling the previous exposure time. The detector was operated with a xenon-based gas mixture for part of the new run, providing technical insights for future detector configurations in IAXO. No counts are detected in the 95% signal-encircling region during the new run, while 0.75 are expected. The new data improve the axion-photon coupling limit to 5.8$\times 10^{-11}\,$GeV$^{-1}$ at 95% C.L. (for $m_a \lesssim 0.02$ eV), the most restrictive experimental limit to date.
Forward citations
Cited by 6 Pith papers
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Dark Matter Haloscope with a Disordered Dielectric Absorber
A disordered dielectric powder can act as a broadband dark-matter-to-photon conversion target, and the proposed DPHaSE experiment could probe QCD axions and dark photons in the 10 meV to 1 eV range.
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Axion-like Particle Search with a Light-Shining-Through-Walls Setup at a $\gamma$-$\gamma$ Collider
A light-shining-through-walls search using a gamma-gamma collider's inverse-Compton photon beam could reach g_aγγ ≈ 3.8e-5 GeV^-1 for m_a < 0.1 eV.
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Gamma Rays from ALP-Photon Conversion and Inverse Compton Reprocessing in Neutron Star Magnetospheres
ALP-to-photon conversion near four pulsars produces mostly sub-MeV emission: Fermi-LAT is insensitive to the channel, COMPTEL data already exclude new parameter space at high ALP mass, and COSI could probe much more.
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Spatial resolution studies with the BabyIAXO Micromegas prototype
The IAXO-D1 Micromegas prototype achieves 100 to 300 micrometer spatial resolution at 5 to 10 keV, below the 1 mm BabyIAXO requirement, with simulations matching the measurements.
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Experiments to test the hypothesis for solar and dark matter axions
This is a pedagogical review of haloscope and helioscope experiments searching for dark matter and solar axions, with an overview of near-future technological developments.
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Axions and Axion-like particles: collider searches
A pedagogical review of the ALP effective field theory, production and decay at colliders, indirect search strategies, and a summary of current bounds on the ALP-photon coupling.
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