Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2012-02-07
Phys. Rev. Lett. 108 (2012) 111803
Physics
High Energy Physics
High Energy Physics - Experiment
6 pages plus author list (19 pages total), 4 figures, 3 tables, matches published version in Physical Review Letters
Scientific paper
10.1103/PhysRevLett.108.111803
A search for the Standard Model Higgs boson is performed in the diphoton decay channel. The data used corresponds to an integrated luminosity of 4.9 fb-1 collected with the ATLAS detector at the Large Hadron Collider in proton-proton collisions at a center-of-mass energy of sqrt(s) = 7 TeV. In the diphoton mass range 110-150 GeV, the largest excess with respect to the background-only hypothesis is observed at 126.5 GeV, with a local significance of 2.8 standard deviations. Taking the look-elsewhere effect into account in the range 110-150 GeV, this significance becomes 1.5 standard deviations. The Standard Model Higgs boson is excluded at 95% confidence level in the mass ranges of 113-115 GeV and 134.5-136 GeV.
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