Abstract
We perform a feasibility study of a beam dump experiment at the International Linear Collider (ILC). To investigate the sensitivity to new light particles at the experiment, we consider models for axion-like particles (ALPs) and a light scalar particle coupled to charged leptons. For both models, we show that the detection sensitivity is almost an order of magnitude higher than other beam dump experiments in the small coupling region. For ALPs, it is shown that the ILC beam dump experiment is highly complementary to bounds from astrophysics. In addition, for the model of the scalar particle, the region favored by the muon $g-2$ experiment can be explored.
Highlights
The International Linear Collider (ILC) experiment is one of the generation experiments using high energy collision with electron (e−) and positron beams [1]
To investigate the sensitivity to new light particles at the experiment, we consider models for axion-like particles (ALPs) and a light scalar particle coupled to charged leptons
For ALPs, it is shown that the ILC beam dump experiment is highly complementary to bounds from astrophysics
Summary
The International Linear Collider (ILC) experiment is one of the generation experiments using high energy collision with electron (e−) and positron (eþ) beams [1]. In the ILC experiment, main beam dumps are expected to be installed for safety. Almost all eþe− beams that pass the collision point are discarded in the main beam dumps, and photons, electrons, muons, etc. The muons pass through the beam dump due to its strong permeability, and these energies are injected into a muon shield that may be placed behind the beam dump. If physics beyond the standard model (BSM) predict particles whose interaction is very weak, the injected energy into the beam dump can be converted to the new particles. It is tempting to plan an experiment to explore these new particles by using the discarded particles after eþe− collisions
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