Latest results on Higgs final-states with photons in ATLAS

A measurement of the Higgs boson property with photon final states in proton-proton collisions with the ATLAS detector at the LHC is presented. The results are based on the data samples corresponds to integrated luminosities of 4.7 fb^{−1} at \sqrt{s}=7 TeV in 2011 and 20.3 fb^{−1} at \sqrt{s}=8 TeV in 2012. From a narrow resonance in diphoton mass spectrum, the mass of the Higgs boson is measured to be m_{H}=125.98\pm0.50 GeV. The measured signal yield, which is a cross section times branching fraction normalised to the Standard Model expectation, is 1.17\pm0.27. These results are based on improvements of photon energy reconstruction with the ATLAS detector.