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

Benedict Allbrooke, Hardeep Bansil, Juraj Bracinik, David Charlton, Andrew Chisholm, Neil Collins, Christopher Curtis, John Garvey, David Hadley, Karl Harrison, Christopher Hawkes, Simon Head, Stephen Hillier, Joseph Lilley, Gilles Mahout, Timothy Martin, Thomas McLaughlan, Paul Newman, Konstantinos Nikolopoulos, Stephen O'NealeJody Palmer, Mark Slater, Jurgen Thomas, Paul Thompson, Peter Watkins, Alan Watson, Miriam Watson, John Wilson

Research output: Contribution to journalLetterpeer-review

417 Citations (Scopus)

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 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 (σ). The local significances of H→γγ, H-> ZZ*->l+l-l'+l'- and H->WW*->l+nul'-nubar, 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.
Original languageEnglish
Pages (from-to)49-66
JournalPhysics Letters B
Volume710
DOIs
Publication statusPublished - 2012

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