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A search for pair-production of heavy leptons (Σ0, Σ±) predicted by the Type III seesaw mechanism to explain the origin of small neutrino masses is presented. The decay channels for the heavy leptons Σ0 →W±e∓ and Σ± →Wνe are considered. Multivariate techniques versus a kinematic selection method are compared. The study is based on proton-proton collisions recorded at the ATLAS detector at the Large Hadron Collider at CERN during 2015 with a center-of-mass energy of 13 TeV. The data used corresponds to an integrated luminosity of 3.2 fb−1 and no evidence of heavy lepton pair-production was observed.

Search for Type III Seesaw Heavy Leptons in proton-proton collisions with the ATLAS detector at the LHC