Latest Results of the OSQAR Photon Regeneration Experiment for Axion-Like Particle Search

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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 $5.7 \cdot 10^{-8}$ GeV$^{-1}$ in the massless limit.
• This result is the most stringent constraint on the di-photon coupling strength ever achieved in laboratory experiments.