  The sensitivity of particle-level fiducial cross section measurements from
ATLAS, CMS and LHCb to a leptophobic top-colour model is studied. The model has
previously been the subject of resonance searches. Here we compare it directly
to state-of-the-art predictions for Standard Model top quark production and
also take into account next-to-leading order predictions for the new physics
signal. We make use of the CONTUR framework to evaluate the sensitivity of the
current measurements, first under the default CONTUR assumption that the
measurement and the SM exactly coincide, and then using the full SM theory
calculation for $t\bar{t}$ at next-to-leading and next-to-next-to-leading order
as the background model. We derive exclusion limits, discuss the differences
between these approaches, and compare to the limits from resonance searches by
ATLAS and CMS.
