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

Abstract : 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 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.
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http://hal.in2p3.fr/in2p3-01343505
Contributor : Emmanuelle Vernay <>
Submitted on : Friday, July 8, 2016 - 3:07:37 PM
Last modification on : Tuesday, May 22, 2018 - 9:48:11 PM

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S. Kraml, U. Laa, L. Panizzi, H. Prager. Scalar versus fermionic top partner interpretations of $t\bar t + E_T^{\rm miss}$ searches at the LHC. Journal of High Energy Physics, Springer Verlag (Germany), 2016, 11, pp.107. ⟨10.1007/JHEP11(2016)107⟩. ⟨in2p3-01343505⟩

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