Effective WIMPs

TL;DR

This paper explores minimal weakly interacting massive particle (WIMP) models with renormalizable couplings to standard model particles, analyzing their relic abundance, collider, and direct detection constraints, especially for colored dark matter interactions.

Contribution

It introduces a minimal class of WIMP models with cubic couplings, providing a framework to compare collider and direct detection constraints in a unified parameter space.

Findings

Collider and direct detection searches are highly complementary.

Direct detection limits push non-self-antiparticle dark matter masses into multi-TeV range.

Collider searches strongly constrain self-antiparticle dark matter models, especially with monojet and jets + MET signals.

Abstract

The 'WIMP miracle' for the relic abundance of thermal dark matter motivates weak scale dark matter with renormalizable couplings to standard model particles. We study minimal models with such couplings that explain dark matter as a thermal relic. The models contain a singlet dark matter particle with cubic renormalizable couplings between standard model particles and 'partner' particles with the same gauge quantum numbers as the standard model particle. The dark matter has spin 0, 1/2, or 1, and may or may not be its own antiparticle. Each model has 3 parameters: the masses of the dark matter and standard model partners, and the cubic coupling. Requiring the correct relic abundance gives a 2-dimensional parameter space where collider and direct detection constraints can be directly compared. We focus on the case of dark matter interactions with colored particles. We find that collider and direct detection searches are remarkably complementary for these models. Direct detection limits for the cases where the dark matter is not its own antiparticle require dark matter masses to be in the multi-TeV range, where they are extremely difficult to probe in collider experiments. The models where dark matter is its own antiparticle are strongly constrained by collider searches for monojet and jets + MET signals. These models are constrained by direct detection mainly near the limit where the dark matter and partner masses are nearly degenerate, where collider searches become more difficult.