Property measurement of 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 ${\rm fb}^{-1}$, an improved measurement of the mass of the Higgs boson is derived from a combined fit to the decay channels $H\rightarrow\gamma\gamma$ and $H\rightarrow ZZ^{*}\rightarrow 4l$ with improved energy-scale calibrations for photons, electrons and muons as well as other analysis improvements. It is $m_{H}=125.36\pm0.37{\rm (stat)}\pm0.18{\rm (syst)}$ GeV. Furthermore, measurement of fiducial and differential cross sections are presented in the $H\rightarrow\gamma\gamma$ decay channel using only the 8 TeV data sample with a luminosity of $20.3{\rm fb}^{-1}$. The observed spectra are statistically limited but broadly in line with the theoretical expectations.