Property Measurement Of The Higgs Boson In The Gamma Gamma Final State With The Atlas Detector At The Lhc

With pp collision data sample recorded by the ATLAS experiment at the CERN Large Hadron Collider at center-of-mass energies of 7 TeV and 8 TeV, corresponding to an integrated luminosity of 25 fb(-1), an improved measurement of the mass of the Higgs boson is derived from a combined fit to the decay channels H -> gamma gamma and H -> ZZ* -> 4l with improved energy-scale calibrations for photons, electrons and muons as well as other analysis improvements. It is m(H) = 125.36 +/- 0.37(stat) +/- 0.18(syst) GeV. Furthermore, measurement of fiducial and differential cross sections are presented in the H -> gamma gamma decay channel using only the 8 TeV data sample with a luminosity of 20.3fb(-1). The observed spectra are statistically limited but broadly in line with the theoretical expectations.