New Upper Limit on the Axion-Photon Coupling with an Extended CAST Run with a Xe-Based Micromegas Detector - INSPIRE

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New Upper Limit on the Axion-Photon Coupling with an Extended CAST Run with a Xe-Based Micromegas Detector

CAST

Collaboration

•

K. Altenmüller
(
- U. Zaragoza (main)
)

Jun 24, 2024

9 pages

Published in:

Phys.Rev.Lett. 133 (2024) 22, 221005

Published: Nov 27, 2024

e-Print:

2406.16840 [hep-ex]

DOI:

10.1103/PhysRevLett.133.221005 (publication)

Experiments:

CERN-CAST

View in:

reference search20 citations

Citations per year

Abstract: (APS)

Hypothetical axions provide a compelling explanation for dark matter and could be emitted from the hot solar interior. The CERN Axion Solar Telescope has been searching for solar axions via their back conversion to x-ray photons in a 9-T 10-m long magnet directed toward the Sun. We report on an extended run with the 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 configurations. No counts were detected in the 95% signal-encircling region during the new run, while 0.75 were expected. The new data improve the axion-photon coupling limit to

5.8 \times 10^{- 11} {GeV}^{- 1}

at 95% CL (for

m_{a} ≲ 0.02 eV

), the most restrictive experimental limit to date.

Note:

Corresponding authors: C. Margalejo (cmargalejo@unizar.es) and J. Ruz (Jaime.Ruz@cern.ch)

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