  Simplified models provide a useful way to study the impacts of a small number
of new particles on experimental observables and the interplay of those
observables, without the need to construct an underlying theory. In this study,
we perform global fits of simplified dark matter models with GAMBIT using an
up-to-date set of likelihoods for indirect detection, direct detection and
collider searches. We investigate models in which a scalar or fermionic dark
matter candidate couples to quarks via an s-channel vector mediator. Large
parts of parameter space survive for each model. In the case of Dirac or
Majorana fermion dark matter, excesses in LHC monojet searches and relic
density limits tend to prefer the resonance region, where the dark matter has
approximately half the mass of the mediator. A combination of vector and
axial-vector couplings to the Dirac candidate also leads to competing
constraints from direct detection and unitarity violation.
