Combined search for the Standard Model Higgs boson using up to 4.9 fb[superscript −1] of pp collision data at √s = 7 TeV with the ATLAS detector at the LHC

• Main Author: Taylor, Frank E. (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor)
• Format: Article
• Language: English
• Published: Elsevier, 2014-12-03T14:47:15Z.
• Subjects: Article
• Online Access: Get fulltext

 A combined search for the Standard Model Higgs boson with the ATLAS experiment at the LHC using datasets corresponding to integrated luminosities from 1.04 fb[superscript −1] to 4.9 fb[superscript −1] of pp collisions collected at √s = 7 TeV is presented. The Higgs boson mass ranges 112.9-115.5 GeV, 131-238 GeV and 251-466 GeV are excluded at the 95% confidence level (CL), while the range 124-519 GeV is expected to be excluded in the absence of a signal. An excess of events is observed around m[subscript H]∼126 GeV with a local significance of 3.5 standard deviations (σ). The local significances of H→γγ, H→ZZ(*)→ℓ[superscript +]ℓ[superscript −]ℓ'[superscript +]ℓ'[superscript −] and H→WW(*)→ℓ[superscript +]νℓ'[superscript −][bar over v], the three most sensitive channels in this mass range, are 2.8σ, 2.1σ and 1.4σ, respectively. The global probability for the background to produce such a fluctuation anywhere in the explored Higgs boson mass range 110-600 GeV is estimated to be ∼1.4% or, equivalently, 2.2σ.