Constraints on Z' models from LHC dijet searches and implications for dark matter

TL;DR

This paper combines LHC dijet search results to constrain Z' models, especially those linked to dark matter, narrowing the viable parameter space for Z' and dark matter masses.

Contribution

It provides a framework to apply LHC dijet constraints to generic Z' models and explores implications for dark matter relic abundance.

Findings

Dijet searches impose strong bounds on Z' models.

Allowed dark matter masses are significantly constrained by dijet limits.

The analysis narrows the parameter space for Z' and dark matter compatibility.

Abstract

We analyse a combination of ATLAS and CMS searches for dijet resonances at run I and run II, presenting the results in a way that can be easily applied to a generic Z' model. As an illustrative example, we consider a simple model of a Z' coupling to quarks and dark matter. We first study a benchmark case with fixed couplings and then focus on the assumption that the Z' is responsible for setting the dark matter relic abundance. Dijet constraints place significant bounds on this scenario, allowing us to narrow down the allowed range of dark matter masses for given Z' mass and width.