Latest Results of the OSQAR Photon Regeneration Experiment for Axion-Like Particle Search
R. Ballou, G. Deferne, L. Duvillaret, M. Finger, Jr., M. Finger, L., Flekova, J. Hosek, T. Husek, V. Jary, R. Jost, M. Kral, S. Kunc, K., Macuchova, K. A. Meissner, J. Morville, P. Pugnat, D. Romanini, M. Schott, A., Siemko, M. Slunecka, M. Sulc, G. Vitrant, C. Weinsheimer

TL;DR
The OSQAR experiment searches for axion-like particles using photon regeneration and sets the most stringent laboratory constraints on their coupling strength, with no excess events observed.
Contribution
This paper reports the latest results of the OSQAR experiment, providing the most stringent laboratory limits on axion-like particles' di-photon coupling.
Findings
No excess events observed in the experiment.
Constraints on di-photon coupling down to 5.7 x 10^{-8} GeV^{-1}.
Most stringent laboratory limits to date.
Abstract
The OSQAR photon regeneration experiment searches for pseudoscalar and scalar axion-like particles by the method of "Light Shining Through a Wall", based on the assumption that these weakly interacting sub-eV particles couple to two photons to give rise to quantum oscillations with optical photons in strong magnetic field. No excess of events has been observed, which constrains the di-photon coupling strength of both pseudoscalar and scalar particles down to GeV in the massless limit. This result is the most stringent constraint on the di-photon coupling strength ever achieved in laboratory experiments.
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