SEARCH FOR THE STANDARD MODEL HIGGS BOSON IN THE DECAY MODE H → γγ WITH ATLAS

This article summarize the search for the Standard Model Higgs Boson in proton-proton collisions with the ATLAS detector at the LHC in the diphoton channel. The data used correspond to an integrated luminosity of 4.8 fb−1 collected with the ATLAS detector at a centre-of-mass energy of $sqrt{s}$ = 7 TeV and 5.9 fb−1 at $\sqrt{s}$ = 8 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 4.5 standard deviations. Taking the look- elsewhere effect into account in the range 110–150 GeV, this significance becomes 3.6 standard deviations. The standard model Higgs boson is excluded at 95% confidence level in the mass ranges of 112–123 GeV and 132-143 GeV.