  We discuss the phenomenology associated with a resonant monotop collider
signal, i.e. a signal in which a single top quark is resonantly produced in
association with missing energy through an s-channel scalar exchange. We study
both the bounds originating from dedicated monotop searches performed by the
ATLAS and CMS experiments, and the constraints associated with other processes
that could be induced by a new physics context favouring monotop production at
colliders. The latter class of constraints includes, in particular, the
recasting of analyses from the LHC and the TeVatron. All theoretical
calculations are performed at the next-to-leading order accuracy in QCD, and we
finally combine all results to establish the present limits on the parameter
space and test the relevance of the monotop signal at the LHC Run 2.
