2011/06/14 by ATLAS Collaboration · 1 voice
Physics and Astronomy · #hep-ex
paper · pdf · doi:10.1140/epjc/s10052-011-1728-9
published as Eur.Phys.J.C 71 (2011) 1728 · 19 pages plus author list (31 pages total), 12 figures, 10 tables, final version as it appears in EPJC
arxiv published 2011/06/14 · arxiv created 2011/11/29 · arxiv updated 2011/11/29
A search for the Standard Model Higgs boson at the Large Hadron Collider (LHC) running at a centre-of-mass energy of 7 TeV is reported, based on a total integrated luminosity of up to 40 pb-1 collected by the ATLAS detector in 2010. Several Higgs boson decay channels: H -> γγ, H -> ZZ (*) -> llll, H -> ZZ -> llνν, H -> ZZ -> llqq, H -> W W (*) -> lνlν and H -> W W -> lνqq (l is e, μ) are combined in a mass range from 110 GeV to 600 GeV. The highest sensitivity is achieved in the mass range between 160 GeV and 170 GeV, where the expected 95% CL exclusion sensitivity is at Higgs boson production cross sections 2.3 times the Standard Model prediction. Upper limits on the cross section for its production are determined. Models with a fourth generation of heavy leptons and quarks with Standard Model-like couplings to the Higgs boson are also investigated and are excluded for a Higgs boson mass in the range from 140 GeV to 185 GeV.