Aad, G.Abbott, B.Abdallah, J.Abdinov, O.Aben, R.Abolins, M.AbouZeid, O. S.Izen, Joseph M.Leyton, MichaelMeirose, BernhardNamasivayam, HarisankarReeves, KendallATLAS Collaboration2017-11-102017-11-102016-02-092016-02-091029-8479http://hdl.handle.net/10735.1/5584A search is presented for a new, light boson with a mass of about 1 GeV and decaying promptly to jets of collimated electrons and/or muons (lepton-jets). The analysis is performed with 20.3 fb⁻¹ of data collected by the ATLAS detector at the Large Hadron Collider in proton-proton collisions at a centre-of-mass energy of 8 TeV. Events are required to contain at least two lepton-jets. This study finds no statistically significant deviation from predictions of the Standard Model and places 95% confidence-level upper limits on the contribution of new phenomena beyond the SM, incuding SUSY-portal and Higgs-portal models, on the number of events with lepton-jets.enCC BY 4.0 (Attribution)©2016 CERN, for the ATLAS Collaborationhttp://creativecommons.org/licenses/by/4.0/Hadrons--ScatteringProton-proton interactionsJets (Nuclear physics)BosonsElectron beamsMesons—DecayBosonsHiggs-bosonsPhotonsElectron-positron interactionsarticleAad, G., B. Abbott, J. Abdallah, O. Abdinov, et al. 2016. "A search for prompt lepton-jets in pp collisions at root s=8 TeV with the ATLAS detector." Journal of High Energy Physics 2(62), doi:10.1007/JHEP02(2016)062262