Effective Leptophilic WIMPs at the $e^+e^-$ collider

TL;DR

This paper explores leptophilic WIMP dark matter models using effective operators, analyzing relic density, direct detection constraints, and collider prospects at the ILC within an EFT framework.

Contribution

It provides a comprehensive analysis of leptophilic WIMP parameter space considering multiple operators, relic density, direct detection, and collider signals at the ILC.

Findings

Allowed parameter space identified for DM mass and NP scale.

Collider prospects for detecting WIMPs at ILC with monophoton signals.

Constraints from XENON1T restrict the viable models.

Abstract

We consider higher-dimensional effective (EFT) operators consisting of fermion dark matter (DM) connecting to Standard Model (SM) leptons upto dimension six. Considering all operators together and assuming the DM to undergo thermal freeze-out, we find out relic density allowed parameter space in terms of DM mass ($m_\chi$) and New Physics (NP) scale ($\Lambda$) with one loop direct search constraints from XENON1T experiment. Allowed parameter space of the model is probed at the proposed International Linear Collider (ILC) via monophoton signal for both Dirac and Majorana cases, limited by the centre-of-mass energy $\sqrt s=$1 TeV, where DM mass can be probed within $m_\chi<\frac{\sqrt{s}}{2}$ for the pair production to occur and $\Lambda>\sqrt s$ for the validity of EFT framework.