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

Barton, Adam and Beattie, Michael and Borissov, Guennadi and Bouhova-Thacker, Eva and Dearnaley, William and Fox, Harald and Grimm, Kathryn and Henderson, Robert and Hughes, Gareth and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin and Love, Peter and Maddocks, Harvey and Skinner, Malcolm and Smizanska, Maria and Walder, James and Wharton, Andy (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 1550-7998

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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 ∓ (ℓ=e,μ,τ ) and L ± →W ± ν (ν=ν e ,ν μ ,ν τ ) 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.

Item Type: Journal Article
Journal or Publication Title: Physical Review D
Additional Information: This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. © 2015 CERN, for the ATLAS Collaboration
Departments: Faculty of Science and Technology > Physics
ID Code: 75608
Deposited By: ep_importer_pure
Deposited On: 14 Sep 2015 09:13
Refereed?: Yes
Published?: Published
Last Modified: 25 Feb 2020 02:19
URI: https://eprints.lancs.ac.uk/id/eprint/75608

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