Search for a heavy Standard Model Higgs boson in the channel H->ZZ->llqq using the ATLAS detector

Abstract

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.

11 pages plus author list (26 pages total), 4 figures, 1 table, final version to appear in Physics Letters B

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• Analysis of the NMSSM Higgs Boson Masses at One-Loop Level
• Single Vectorlike Quark Production at the LHC
• Collider Constraints and Prospects of a Scalar Singlet Extension to Higgs Portal Dark Matter
• Dark Higgs Models at the 7 TeV LHC
• Search for a Standard Model Higgs boson in the H -> ZZ -> llnunu decay channel using 4.7 fb-1 of sqrt(s) = 7 TeV data with the ATLAS detector
• BMSSM Higgs Bosons at the 7 TeV LHC
• Heavy MSSM Higgs production at the LHC and decays to WW,ZZ at higher orders
• Search for a Standard Model Higgs boson in the mass range 200-600 GeV in the H->ZZ->llqq decay channel
• SUSY Higgs searches : beyond the MSSM
• Semileptonic decays of the Higgs boson at the Tevatron
• Probing strongly interacting W's at the ILC with polarized beams
• Phenomenological Aspects of the $E_6$SSM
• Light dark matter around 100 GeV from the inert doublet model
• Effective Approaches in and Beyond the MSSM : applications to Higgs Physics and Dark Matter observables