Search for the Standard Model Higgs boson through the H -> ZZ -> (llnunu,llqq) decay channels with the ATLAS detector

Searches for a heavy Standard Model (SM) Higgs boson decaying via H -> ZZ -> llqq or H -> ZZ -> llnunu, where l = e,mu, are presented. The analyses are based on proton-proton collision data at sqrt(s)=7 TeV, collected by the ATLAS experiment at the CERN LHC during 2011 and corresponding to an integrated luminosity of 4.7~fb^-1. No significant excess of data above the expected SM background is observed in either channel. Upper limits on the production cross section for a Higgs boson with a mass in the range between 300 and 600~GeV are derived. The H -> ZZ -> llqq decay channel excludes a SM Higgs boson in the mass ranges 300-322 GeV and 353-410 GeV, while the H -> ZZ -> llnunu channel excludes a wide mass range between 319-558 GeV, both at 95% CL.