Combined search for the Standard Model Higgs boson using up to 4.9 fb-1 of pp collision data at √{ s} = 7 TeV with the ATLAS detector at the LHC
Abstract
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-1 to 4.9 fb-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 mH ∼ 126 GeV with a local significance of 3.5 standard deviations (σ). The local significances of H → γγ, H → ZZ (*) →ℓ+ℓ-ℓ‧+ℓ‧- and H → WW (*) →ℓ+ νℓ‧-νbar, 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.
- Publication:
-
Physics Letters B
- Pub Date:
- March 2012
- DOI:
- 10.1016/j.physletb.2012.02.044
- arXiv:
- arXiv:1202.1408
- Bibcode:
- 2012PhLB..710...49A
- Keywords:
-
- High Energy Physics - Experiment
- E-Print:
- 8 pages plus author list (22 pages total), 4 figures, author list corrected, matches published version in PLB