# WIMP Searches at the International Linear Collider

## TL;DR

This paper discusses the potential for detecting WIMP dark matter particles at the International Linear Collider using mono-photon signatures, emphasizing the importance of beam polarization and detector design.

## Contribution

It presents a detailed study of WIMP search prospects at the ILC, including the use of effective field theory and detector requirements for mono-photon analyses.

## Key findings

- WIMP masses up to nearly half the collider energy can be probed.
- Polarized beams significantly improve background suppression.
- Detector specifications are crucial for successful WIMP detection.

## Abstract

Weakly Interacting Massive Particles (WIMPs, $\chi$) are candidates for Dark Matter. WIMP searches at lepton colliders are complementary to searches at hadron colliders and direct and indirect detection, since they directly probe the coupling to electrons which a priori is independent of the coupling to hadrons. Like at hadron colliders, WIMP pair production can be observed via an additional tag particle, in particular a photon from initial state radiation ($e^+e^-\rightarrow\chi\chi\gamma$). With this technique WIMP masses to nearly half the centre-of-mass energy can be probed. Polarised beams are essential to reduce Standard Model backgrounds and to characterize the properties of the new particles in case a signal is discovered. Prospects for a mono-photon WIMP study at the International Linear Collider will be discussed in the context of EFT. In addition, detector requirements will be presented.