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Axions and axion-like particles (ALPs) are hypothetical, low-mass
particles predicted by extensions of the Standard Model of particle
physics. Initially proposed to address the strong charge-parity (CP)
problem in Quantum Chromodynamics, axions have become prominent dark
matter candidates, while ALPs arise naturally in various beyond-Standard
Model frameworks, including string theory. Their extremely weak
couplings to ordinary matter render them elusive, yet they remain
central to advancing our understanding of the universe’s fundamental
structure.
Experimental efforts to detect axions and ALPs encompass a broad array
of techniques, including haloscopes, helioscopes, laboratory-based
experiments, as well as indirect constraints from astrophysical and
cosmological observations. These searches exploit state-of-the-art
developments in resonant cavities, high-field magnets, and
high-intensity lasers to explore previously inaccessible parameter
regions. The ongoing quest for axions and ALPs is not only a test of
theoretical models but a potential gateway to groundbreaking discoveries
in physics.
This talk will provide an overview of the current experimental
landscape, describe the principal detection methods, summarize recent
findings, and outline future directions in the search for axions and
ALPs."