Combined search for the Standard Model Higgs boson using up to 4.9 fb(-1) of pp collision data at root s=7 TeV with the ATLAS detector at the LHC
2012 (English)In: Physics Letters B, ISSN 0370-2693, Vol. 710, no 1, 49-66 p.Article in journal (Refereed) Published
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 root 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(H) similar to 126 GeV with a local significance of 3.5 standard deviations (sigma). The local significances of H -> gamma, H -> ZZ(()*()) -> l(+)l(-)l'(+)l'(-) and H -> WW(*()) l(+)nu l'(-)(nu) over bar, 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 similar to 1.4% or, equivalently, 2.2 sigma.
Place, publisher, year, edition, pages
2012. Vol. 710, no 1, 49-66 p.
Hadron Colliders, Qcd Corrections, Massless Particles, Broken Symmetries, Nnlo Qcd, Decays
IdentifiersURN: urn:nbn:se:kth:diva-96833DOI: 10.1016/j.physletb.2012.02.044ISI: 000302672500006ScopusID: 2-s2.0-84862776922OAI: oai:DiVA.org:kth-96833DiVA: diva2:533176
QC 20120613. Author count: 30512012-06-132012-06-13Bibliographically approved