Closing in on $t$-channel simplified dark matter models
  A comprehensive analysis of cosmological and collider constraints is
presented for three simplified models characterised by a dark matter candidate
(real scalar, Majorana fermion and real vector) and a coloured mediator
(fermion, scalar and fermion respectively) interacting with the right-handed up
quark of the Standard Model. Constraints from dark matter direct and indirect
detection and relic density are combined with bounds originating from the
re-interpretation of a full LHC run 2 ATLAS search targeting final states with
multiple jets and missing transverse energy. Projections for the
high-luminosity phase of the LHC are also provided to assess future exclusion
and discovery reaches, which show that analogous future search strategies will
not allow for a significant improvement compared with the present status. From
the cosmological point of view, we demonstrate that thermal dark matter is
largely probed (and disfavoured) by constraints from current direct and
indirect detection experiments. These bounds and their future projections have
moreover the potential of probing the whole parameter space when combined with
the expectation of the high-luminosity phase of the LHC.
