Constraints on Z' models from LHC dijet searches

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.