Scalar Simplified Models for Dark Matter

TL;DR

This paper introduces minimal scalar and pseudoscalar simplified models for dark matter interactions, extending the validity of collider searches and connecting them with non-collider experiments, while emphasizing the importance of loop-induced couplings in LHC analyses.

Contribution

It presents a new set of simplified models for dark matter that incorporate loop-induced couplings and connect collider and non-collider detection methods.

Findings

Loop-induced gluon couplings significantly affect LHC cross sections.

Models are constrained by direct, indirect, and collider searches.

Connections with the Higgs sector are discussed.

Abstract

We introduce a set of minimal simplified models for dark matter interactions with the Standard Model, connecting the two sectors via either a scalar or pseudoscalar particle. These models have a wider regime of validity for dark matter searches at the LHC than the effective field theory approach, while still allowing straightforward comparison to results from non-collider dark matter detection experiments. Such models also motivate dark matter searches in multiple correlated channels. In this paper, we constrain scalar and pseudoscalar simplified models with direct and indirect detection experiments, as well as from existing LHC searches with missing energy plus tops, bottoms, or jets, using the exact loop-induced coupling with gluons. This calculation significantly affects key differential cross sections at the LHC, and must be properly included. We make connections with the Higgs sector, and conclude with a discussion of future searches at the LHC.