Probing ALP-portal Fermionic Dark Matter at the $e^+e^-$ Colliders

TL;DR

This paper investigates the potential of future electron-positron colliders to detect fermionic dark matter mediated by axion-like particles through mono-photon plus missing energy signals, focusing on the ALP-photon interaction.

Contribution

It introduces a novel analysis of ALP-portal fermionic dark matter detection prospects at $e^+e^-$ colliders, emphasizing the role of the ALP-photon coupling in relic density and signal distinguishability.

Findings

Distinct missing energy signatures can differentiate signal from background.

ALP-photon coupling sensitivity can be enhanced using $ ext{chi}^2$ analysis.

Future colliders have promising potential to probe ALP-portal dark matter.

Abstract

Axion-like particles (ALPs) are promising candidates for mediating interactions between a dark sector and the Standard Model (SM). In this work, considering the effective interactions of ALPs with the SM gauge bosons and a fermion dark matter (DM), we explore the DM relic satisfied parameter space and assess its testability through indirect searches. The potential of probing such ALP-portal fermionic DM at electron-positron colliders is investigated with the mono-photon + missing energy final states. We show that a spectacular distinction between the signal and SM background is possible via missing energy variable, the seed of which lies in the ALP-photon interaction, which also governs the relic density of DM. We further discuss the sensitivity of ALP-photon coupling using the $\chi^2$ analysis at the future electron-positron collider specifications.