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

Abstract

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

39 pages, 8 figures, 17 tables. Version accepted by JHEP. Efficiency maps derived for this paper can be downloaded from http://lpsc.in2p3.fr/projects-th/recasting/susy-vs-vlq/ttbarMET

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• Machine learning tagged boosted dark photon: A signature of fermionic portal matter at the LHC