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An analysis is presented of events containing jets including at least one$b$-tagged jet, sizable missing transverse momentum, and at least two chargedleptons including a pair of the same electric charge, with the scalar sum ofthe jet and lepton transverse momenta being large. Standard Model processesrarely produce these final states, but several models of physics beyond theStandard Model predict an enhanced production rate of such events. Specificmodels with this feature are considered here: vector-like $T$, $B$, and$T_{5/3}$ quark pair production, and four top quark production under threescenarios (Standard Model, contact interaction, and extra-dimensions). A datasample of 3.2 fb$^{-1}$ of $pp$ collisions at a center-of-mass energy of$\sqrt{s}$=13 TeV recorded by the ATLAS detector at the Large Hadron Collideris used in this analysis. Several signal regions are defined, in which theconsistency between the data yield and the background-only hypothesis ischecked, and 95% confidence level limits are set on various signal models. Thefocus here is on models yielding signatures with four top quarks.

Why stop at two tops? Search for exotic production of top quarks in final states with same-sign leptons and $b$-jets at 13 TeV