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

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Aad G., Abbott B., Abdallah J., Khalek S. A., Abdelalim A. A., Abdesselam A., ...More

PHYSICS LETTERS B, vol.710, no.3, pp.383-402, 2012 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 710 Issue: 3
  • Publication Date: 2012
  • Doi Number: 10.1016/j.physletb.2012.03.005
  • Journal Name: PHYSICS LETTERS B
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.383-402
  • Middle East Technical University Affiliated: Yes


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. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.