  We consider a scenario where an SU(2) triplet scalar acts as the portal for a
scalar dark matter particle. We identify regions of the parameter space, where
such a triplet coexists with the usual Higgs doublet consistently with all
theoretical as well as neutrino, accelerator and dark matter constraints, and
the triplet-dominated neutral state has substantial invisible branching
fraction. LHC signals are investigated for such regions, in the final state
{\em same-sign dilepton + $\ge$ 2 jets + $\not E_T$.} While straightforward
detectability at the high-luminosity run is predicted for some benchmark points
in a cut-based analysis, there are other benchmarks where one has to resort to
gradient boosting/neural network techniques in order to achieve appreciable
signal significance.
