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We investigate the potential of the channel {\em mono-Higgs + MET} inyielding signals of dark mater at the high-luminosity Large Hadron Collider(LHC). As illustration, a scalar dark matter in a Higgs portal scenario hasbeen chosen, whose phenomenological viability has been ensured by postulatingthe existence of dimension-6 operators that enable cancellation in certainamplitudes for elastic scattering of dark matter in direct search experiments.These operators are found to have non-negligible contribution to the mono-Higgssignal. Thereafter, we carry out a detailed analysis of this signal, with theaccompanying MET providing a useful handle in suppressing backgrounds. Signalsfor the Higgs decaying into both the diphoton and $b{\bar b}$ channels havebeen studied. A cut-based simulation is presented first, followed by ademonstration of how the statistical significance can be improved throughanalyses based on Boosted Decision Trees and Artificial Neural Network. Theimprovement is found to be especially noticeable for the $b{\bar b}$ channel.

The mono-Higgs + MET signal at the Large Hadron Collider: a study on the $\gamma\gamma$ and $b\bar{b}$ final states