CERN Accelerating science

Article
Report number arXiv:2406.16840
Title New Upper Limit on the Axion-Photon Coupling with an Extended CAST Run with a Xe-Based Micromegas Detector
Author(s) CAST Collaboration  Show all 64 authors
Publication 2024-11-27
Imprint 2024-06-24
Number of pages 9
Note Corresponding authors: C. Margalejo (cmargalejo@unizar.es) and J. Ruz (Jaime.Ruz@cern.ch)
In: Phys. Rev. Lett. 133 (2024) 221005
DOI 10.1103/PhysRevLett.133.221005 (publication)
Subject category hep-ex ; Particle Physics - Experiment
Accelerator/Facility, Experiment CAST
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 5.8×1011GeV1 at 95% C.L. (for ma0.02 eV), the most restrictive experimental limit to date.
Copyright/License preprint: (License: CC BY 4.0)
publication: © 2024-2025 authors (License: CC BY 4.0), sponsored by SCOAP³



Corresponding record in: Inspire


 Record created 2024-06-26, last modified 2024-12-07


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