Articulo
Combined search for the Standard Model Higgs boson using up to 4.9 fb<sup>-1</sup> of pp collision data at √s = 7 TeV with the ATLAS detector at the LHC
Autor
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín F.
The ATLAS Collaboration
Institución
Resumen
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<sup>-1</sup> to 4.9 fb<sup>-1</sup> 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<sub>H</sub> ∼ 126 GeV with a local significance of 3.5 standard deviations (σ). The local significances of H → γγ, H → ZZ(<sup>∗</sup>) →ℓ+ℓ-ℓ'+ℓ'- and H → WW(<sup>∗</sup>) → ℓ+νℓ'-ν¯, 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. Facultad de Ciencias Exactas