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If new leptons exist close to the electroweak scale, they can be produced inpairs at LHC through standard or new interactions. We study the production ofheavy lepton pairs in SM extensions with: (i) a Majorana or Dirac leptontriplet, as those appearing in type-III seesaw; (ii) a lepton isodoublet(N,E)_{L,R}; (iii) a charged isosinglet E_{L,R}; (iv) a Majorana or Diracneutrino singlet N and an additional Z' gauge boson. It is shown that thetrilepton final state l+-l+-l-+, which has a small SM background, constitutesthe golden channel for heavy neutrino searches, being very sensitive toMajorana or Dirac neutrinos in triplet, doublet or singlet SU(2)_Lrepresentations. For higher luminosities, signals in this final state can alsodistinguish lepton triplets from doublets and singlets. The Majorana or Diracnature of the heavy neutrinos is revealed by the presence or not of like-signdilepton l+-l+- signals without significant missing energy. Notably, l+-l+-signals but with large missing energy are characteristic of Dirac triplets,distinguishing them from the other two models with a heavy Dirac neutrino.Further discrimination is achieved with the analysis of the clean l+l+l-l-final state.

Heavy lepton pair production at LHC: model discrimination with multi-lepton signals