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

TL;DR

This paper proposes a fixed-target experiment at KEK Linac using electron and positron beams to search for Axion-like particles, aiming to explore a parameter space gap between existing beam dump and collider experiments.

Contribution

It introduces a novel experimental setup at KEK Linac for ALP detection, expanding the search region beyond current experimental limits.

Findings

The proposed setups can explore previously untested ALP parameter space.

Sensitivity evaluations show potential to fill the gap between beam dump and collider experiments.

The experiment complements existing searches for Axion-like particles.

Abstract

We propose a fixed-target experiment to search for Axion-like particles (ALPs) coupling to photons, which utilizes electron and positron beams available at KEK Linac. The sensitivity to ALP 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 can explore the gap between the search region excluded by the beam dump experiments and the $e^+e^-$ collider experiments.