Dark matter searches with mono-photon signature at future e$^+$e$^-$ colliders

TL;DR

This paper explores the potential of future e+e- colliders like ILC and CLIC to detect dark matter through mono-photon signatures, analyzing mediator models and setting limits on dark matter production.

Contribution

It provides the first detailed study of dark matter searches via mono-photon signatures at future e+e- colliders, including detector effects and mediator parameter scans.

Findings

Mono-photon analysis yields more stringent limits than direct resonance searches for mediator masses up to collider energy.

The study covers a wide range of mediator masses and widths, enhancing dark matter detection strategies.

Detector effects are incorporated, providing realistic sensitivity estimates for future colliders.

Abstract

As any e$^+$e$^-$ scattering process can be accompanied by a hard photon emission from the initial state radiation, the analysis of the energy spectrum and angular distributions of those photons can be used to search for hard processes with an invisible final state. Thus high energy e$^+$e$^-$ colliders offer a unique possibility for the most general search of Dark matter based on the mono-photon signature. We consider production of DM particles via a mediator at the International Linear Collider (ILC) and Compact Linear Collider (CLIC) experiments taking into account detector effects within the DELPHES fast simulation framework. Limits on the light DM production in a generic model are set for a wide range of mediator masses and widths. For mediator masses up to the centre-of-mass energy of the collider, results from the mono-photon analysis are more stringent than the limits expected from direct resonance searches in Standard Model decay channels.