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Search for the Standard Model Higgs boson in the decay channel H -> ZZ((*)) -> 4l with 4.8 fb(-1) of pp collision data at root s=7 TeV with ATLAS
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). (Elementarpartikelfysik)
Stockholm University, Faculty of Science, Department of Physics. (Systemfysik)
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). (Elementarpartikelfysik)
Stockholm University, Faculty of Science, Department of Physics. (Systemfysik)
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2012 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 710, no 3, 383-402 p.Article in journal (Refereed) Published
Abstract [en]

This 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.

Place, publisher, year, edition, pages
2012. Vol. 710, no 3, 383-402 p.
Keyword [en]
LHC, ATLAS, Higgs, Leptons
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-84166DOI: 10.1016/j.physletb.2012.03.005ISI: 000303081900002OAI: oai:DiVA.org:su-84166DiVA: diva2:579157
Note

AuthorCount:3066;

Available from: 2012-12-19 Created: 2012-12-18 Last updated: 2017-12-06Bibliographically approved

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Åsman, BarbroBohm, ChristianClément, ChristopheEriksson, DanielGellerstedt, KarlHellman, StenHolmgren, Sven-OlofJon-And, KerstinKim, HyeonKlimek, PawelLundberg, JohanMilstead, David A.Moa, TorbjörnNordkvist, BjörnOhm, Christian C.Papadelis, ArasSellden, BjörnSilverstein, Samuel B.Sjölin, JörgenStrandberg, SaraTylmad, MajaYang, Zhaoyu
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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