Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2011-08-25
Phys.Lett.B 707 (2012) 27-45
Physics
High Energy Physics
High Energy Physics - Experiment
11 pages plus author list (26 pages total), 4 figures, 1 table, final version to appear in Physics Letters B
Scientific paper
10.1016/j.physletb.2011.11.056
A search for a heavy Standard Model Higgs boson decaying via H->ZZ->llqq, where l=e,mu, is presented. The search is performed using a data set of pp collisions at sqrt(s)=7 TeV, corresponding to an integrated luminosity of 1.04 fb^-1 collected in 2011 by the ATLAS detector at the CERN LHC collider. No significant excess of events above the estimated background is found. Upper limits at 95% confidence level on the production cross section (relative to that expected from the Standard Model) of a Higgs boson with a mass in the range between 200 and 600 GeV are derived. Within this mass range, there is at present insufficient sensitivity to exclude a Standard Model Higgs boson. For a Higgs boson with a mass of 360 GeV, where the sensitivity is maximal, the observed and expected cross section upper limits are factors of 1.7 and 2.7, respectively, larger than the Standard Model prediction.
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