Search for type-III Seesaw heavy leptons in pp collisions at√s=8 TeV with the ATLAS Detector

Aad G, G and Abbott B, B and Abdallah J, J and Abdinov O, O and Aben R, R and Krasznahorkay, Attila and Nagai, Yoshikazu and Pásztor, Gabriella and Tóth, József (2015) Search for type-III Seesaw heavy leptons in pp collisions at√s=8 TeV with the ATLAS Detector. PHYSICAL REVIEW D, 92 (3). ISSN 2470-0010

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Abstract

A search for the pair-production of heavy leptons (N 0, L±) predicted by the type-III seesaw theory formulated to explain the origin of small neutrino masses is presented. The decay channels N 0 → W ±l∓ (` = e, μ, τ ) and L± → W ±ν (ν = νe, νμ, ντ ) are considered. The analysis is performed using the final state that contains two leptons (electrons or muons), two jets from a hadronically decaying W boson, and large missing transverse momentum. The data used in the measurement correspond to an integrated luminosity of 20.3 fb−1 of pp collisions at √s = 8 TeV collected by the ATLAS detector at the LHC. No evidence of heavy lepton pair-production is observed. Heavy leptons with masses below 325–540 GeV are excluded at the 95% confidence level, depending on the theoretical scenario considered.

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