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We assess how different ATLAS and CMS searches for supersymmetry in the$t\bar t + E_T^{\rm miss}$ final state at Run 1 of the LHC constrain scenarioswith a fermionic top partner and a dark matter candidate. We find that theefficiencies of these searches in all-hadronic, 1-lepton and 2-lepton channelsare quite similar for scalar and fermionic top partners. Therefore, in general,efficiency maps for stop-neutralino simplified models can also be applied tofermionic top-partner models, provided the narrow width approximation holds inthe latter. Owing to the much higher production cross-sections of heavy topquarks as compared to stops, masses up to $m_T\approx 850$ GeV can be excludedfrom the Run 1 stop searches. Since the simplified-model results published byATLAS and CMS do not extend to such high masses, we provide our own efficiencymaps obtained with CheckMATE and MadAnalysis 5 for these searches. Finally, wealso discuss how generic gluino/squark searches in multi-jet final statesconstrain heavy top partner production.

Scalar versus fermionic top partner interpretations of $t\bar t + E_T^{\rm miss}$ searches at the LHC