Limits on the production of the standard model Higgs boson in pp collisions at ?s = 7\sqrt{s} = 7 TeV with the A
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文摘
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 (?)→????, H→ZZ→??νν, H→ZZ→??qq, H→WW (?)→?ν?ν and H→WW→?νqq (? 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 at 95% CL for a Higgs boson mass in the range from 140 GeV to 185 GeV.
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