Speaker
Description
We study capability of the ILC beam dump experiment to search for new
physics, comparing the performance of the electron and positron beam
dumps.
Firstly, the dark photon, axion-like particles, and light scalar
bosons are considered as new physics scenarios. We find that the ILC
beam dump experiment has higher sensitivity than past beam dump
experiments, with the positron beam dump having slightly better
performance for new physics particles which are produced by the
electron-positron pair-annihilation.
We also propose an experimental setup to search for sub-GeV dark
matter, the Beam-Dump eXperiment at the ILC (ILC-BDX). We study the
production, decay and scattering of sub-GeV dark matter particles in
several models with a dark photon mediator. Taking into account
beam-related backgrounds due to neutrinos produced in the beam dump as
well as the cosmic-ray background, we evaluate the sensitivity reach
of the ILC-BDX experiment. We find that the ILC-BDX will be able to
probe interesting regions of the model parameter space and, in many
cases, reach well below the relic target.
This talk is based on the following papers: arXiv: 2105.13768 [hep-ph]
and 2301.03816 [hep-ph].
