Aad, G.Abbott, B.Abdallah, J.Khalek, S. AbdelAbdelalim, A. A.Abdesselam, A.The ATLAS CollaborationSultansoy, Saleh2021-09-112021-09-1120120370-26931873-2445https://doi.org/10.1016/j.physletb.2012.03.005https://hdl.handle.net/20.500.11851/5051This Letter presents a search for the Standard Model Higgs boson in the decay channel H -> ZZ((*)) -> l(+)l(-)l(-)+l(')-, where l,l' = e or mu, using proton-proton collisions at root s = 7 TeV recorded with the ATLAS detector and corresponding to an integrated luminosity of 4.8 fb(-1). The four-lepton invariant mass distribution is compared with Standard Model background expectations to derive upper limits on the cross section of a Standard Model Higgs boson with a mass between 110 GeV and 600 GeV. The mass ranges 134-156 GeV, 182-233 GeV, 256-265 GeV and 268-415 GeV are excluded at the 95% confidence level. The largest upward deviations from the background-only hypothesis are observed for Higgs boson masses of 125 GeV, 244 GeV and 500 GeV with local significances of 2.1, 2.2 and 2.1 standard deviations, respectively. Once the look-elsewhere effect is considered, none of these excesses are significant. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.eninfo:eu-repo/semantics/openAccessLHCATLASHiggsLeptonsArticle2-s2.0-8493855849610.1016/j.physletb.2012.03.005