Axion-like Particle Search with a Light-Shining-Through-Walls Setup at a $\gamma$-$\gamma$ Collider

Abstract

In this work, we have explored a practical extension of the conventional light-shining-through-walls technique by making direct use of the high-intensity $\gamma$-ray beam available at a $\gamma$-$\gamma$ collider. The energetic and highly collimated photon flux produced via inverse Compton scattering naturally provides an efficient ALP production stage, while the addition of a regeneration region downstream enables a complete LSW configuration without introducing new experimental complexities. This approach therefore represents an experimentally simple and infrastructure-compatible method for enhancing laboratory sensitivity to axion-like particles. Under conservative assumptions, we find that one year of operation can probe ALP-photon couplings down to $g_{a\gamma\gamma}\simeq 3.82\times 10^{-5} \,\mathrm{GeV^{-1}}$ for $m_a\lesssim 0.1 \,\mathrm{eV}$ when an additional magnetic region is included upstream of the beam dump, improving upon previous laboratory LSW limits by up to an order of magnitude.