Overview of Higgs boson results from ATLAS experiment at the LHC

One year ago, a new particle with the mass of 125 GeV and properties expected for the Standard Model Higgs boson was discovered by ATLAS and CMS experiments at the Large Hadron Collider at CERN in proton-proton collisions at center-of-mass energies √s = 7 TeV and 8 TeV. Since that time more data at 8 TeV were accumulated and analyzed and a progress was reached in the measurement of the particle properties. In this note an overview of Higgs boson results obtained recently at ATLAS experiment is given. Complete dataset which corresponds to 4.7 fb⁻¹ (20.5 fb⁻¹) of the data obtained at √s = 7 TeV (8 TeV) collisions, respectively, is used. The following four signal decay channels are considered: H → γγ, H → ZZ* → 4ℓ, H → WW* → ℓℓνν and H → bb¯. These channels together with H → ττ channel are combined to extract Higgs boson mass, strength, coupling constants, spin and parity. All experimental results are compatible with the Standard Model predictions. (paper)