# Simplified dark matter models with a spin-2 mediator at the LHC

## TL;DR

This paper investigates simplified dark matter models with a spin-2 mediator at the LHC, analyzing how various search strategies constrain the model parameters and highlighting the most effective channels depending on coupling scenarios.

## Contribution

It provides a comprehensive analysis of constraints on spin-2 mediated dark matter models from multiple LHC search channels, emphasizing the conditions under which missing-energy searches are most effective.

## Key findings

- Diphoton and dilepton resonance searches provide the strongest constraints.
- Missing-energy searches are more effective in low-mass regions or with large dark matter couplings.
- The effectiveness of search channels depends on the mediator's coupling to SM particles and dark matter.

## Abstract

We consider simplified dark matter models where a dark matter candidate couples to the standard model (SM) particles via an $s$-channel spin-2 mediator, and study constraints on the model parameter space from the current LHC data. Our focus lies on the complementarity among different searches, in particular monojet and multijet plus missing energy searches and resonance searches. For universal couplings of the mediator to SM particles, missing-energy searches can give stronger constraints than $WW$, $ZZ$, dijet, dihiggs, $t\bar t$, $b\bar b$ resonance searches in the low-mass region and/or when the coupling of the mediator to dark matter is much larger than its couplings to SM particles. The strongest constraints however come from diphoton and dilepton resonance searches. Only if these modes are suppressed, missing-energy searches can be competitive in constraining dark matter models with a spin-2 mediator.