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Searches for dark matter produced via scalar resonances in final statesconsisting of Standard Model (SM) particles and missing transverse momentum areof high relevance at the LHC. Motivated by dark-matter portal models, mostexisting searches are optimized for unbalanced decay topologies for which themissing momentum recoils against the visible SM particles. In this work, weshow that existing searches are also sensitive to a wider class of models,which we characterize by a recently presented simplified model framework. Wepoint out that searches for models with a balanced decay topology can befurther improved with more dedicated analysis strategies. For this study, weinvestigate the feasibility of a new search for bottom-quark associated neutralHiggs production with a $b \bar b Z + p_\text{T}^\text{miss}$ final state andperform a detailed collider analysis. Our projected results in the differentsimplified model topologies investigated here can be easily reinterpreted in awide range of models of physics beyond the SM, which we explicitly demonstratefor the example of the Two-Higgs-Doublet model with an additional pseudoscalarHiggs boson.

A new LHC search for dark matter produced via heavy Higgs bosons using simplified models