Search for axion-like particles with electron and positron beams at the KEK linac

We perform a feasibility study of a fixed-target experiment to search for axion-like particles (ALPS) coupling to photons, utilizing electron and positron beams available at the KEK linac. The sensitivity to ALPs is evaluated for two shielding setups in conjunction with other beam dump experiments, fixed-target experiments, and e(+) e(-) collider experiments. This study shows that the two setups explore the region that cannot be searched by other proposed experiments. In particular, these are sensitive to regions with shorter lifetimes that have not been explored by previous beam dump experiments.