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We study dark matter (DM) production in the mono-Z channel at the 13 TeV LHCboth in an effective field theory framework as well as in simplified modelswith vector mediators, using a multivariate analysis. For DM-quark effectiveoperators with scalar, vector, and tensor couplings and DM mass of 100 GeV, the5$\sigma$ reach in the DM interaction scale $\Lambda$ is around 2, 1, and 3TeV, respectively, for 3 ab$^{-1}$ and assuming a 5\% systematic uncertainty onthe total background normalization. For simplified models with leptophobicvector mediators, the 5$\sigma$ reach for the mass of the mediator is 1.7 TeValso assuming a 5\% systematics and 3 ab$^{-1}$ of integrated luminosity. Thereach for the dark matter interaction scale obtained with the multivariateanalysis using a likelihood function discriminant is at least twice as high asthat obtained from a simple cut and count analysis, once systematics on thebackground normalization larger than a few percent are taken into account.Moreover, the reach is much more stable against degradation due thesesystematic uncertainties.

Searches for Dark Matter at the LHC: A Multivariate Analysis in the Mono-$Z$ Channel