The Top Window for dark matter

TL;DR

This paper explores a model where the top quark acts as the sole portal to dark matter, analyzing its interactions, relic density constraints, and potential collider signatures at the LHC.

Contribution

It introduces an effective Lagrangian framework for top-dark matter interactions and assesses their compatibility with experimental data and collider phenomenology.

Findings

The scenario can satisfy relic density constraints.

Adjustable effective coupling aligns with detection experiments.

Predicts top-pair plus missing energy signature at LHC.

Abstract

We investigate a scenario that the top quark is the only window to the dark matter particle. We use the effective Lagrangian approach to write down the interaction between the top quark and the dark matter particle. Requiring the dark matter satisfying the relic density we obtain the size of the effective interaction. We show that the scenario can be made consistent with the direct and indirect detection experiments by adjusting the size of the effective coupling. Finally, we calculate the production cross section for $t\bar t + \chi \bar \chi$ at the Large Hadron Collider (LHC), which will give rise to an interesting signature of a top-pair plus large missing energy.