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Exotic leptons in large gauge multiplets, appearing in many scenarios beyondthe Standard Model (SM), can be produced at the LHC in pairs or association.Owing to their large masses, their eventual decay products -- SM leptons andbosons -- tend to be highly boosted, with the jets stemming from the SM bosonsmore likely to manifest themselves as a single fat-jet rather than two resolvedones. With the corresponding SM backgrounds being suppressed, final states withtwo or three leptons and one or two fat-jets are expected to be sensitive inprobing exotic fermions much heavier than 1 TeV, and we propose and investigatean appropriate search strategy. To concentrate on the essential, we considerextensions of the SM by leptonic multiplets of a single kind (triplets,quadruplets or quintuplets), bearing in mind that such simplified modelstypically arise as low-energy limits of more ambitious scenarios addressingvarious lacunae of the SM. Performing a systematic and comprehensive study ofnine such scenarios at the 13 TeV LHC, we find that the corresponding $5\sigma$discovery reaches a range from 985 GeV to 1650 GeV (1345 GeV to 2020 GeV) for300 (3000) fb$^{-1}$.

Search for exotic leptons in final states with two or three leptons and fat-jets at 13 TeV LHC