Search for the standard model Higgs boson in the diphoton decay channel with 4.9 fb-1 of pp collision data at √s=7 TeV with ATLAS

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Farrington, Sinead ; HASH(0x561a13c784a0) (2012)
  • Publisher: American Physical Society
  • Related identifiers: doi: 10.1103/PhysRevLett.108.111803
  • Subject: QC
    arxiv: Nuclear Experiment | Astrophysics::High Energy Astrophysical Phenomena | High Energy Physics::Experiment

A search for the standard model Higgs boson is performed in the diphoton decay channel. The data used correspond 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 √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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