Combined search for the Standard Model Higgs boson using up to 4.9 fb-1 of pp collision data at sqrt(s) = 7 TeV with the ATLAS detector at the LHC

The ATLAS Collaboration;Aad, Georges;Jez, Pavel;Tanasijczuk, Andres Jorge;et.al.
(2012) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 710, n° 1, p. 49-66 (2012)

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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 sqrt(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 (sigma). The local significance of H -> gamma gamma, H -> ZZ(*) -> lll'l' and H -> WW(*) -> lvl'v, the three most sensitive channels in this mass range, are 2.8 sigma, 2.1 sigma and 1.4 sigma, 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 2.2 sigma.
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The ATLAS Collaboration, Aad, G., Jez, P., Tanasijczuk, A. J., & et al. (2012). Combined search for the Standard Model Higgs boson using up to 4.9 fb-1 of pp collision data at sqrt(s) = 7 TeV with the ATLAS detector at the LHC. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 710(1), 49-66. https://doi.org/10.1016/j.physletb.2012.02.044 (Original work published 2012)