Measurements of the Standard Model Higgs parameters at ATLAS

Full Text:Once the Higgs boson is discovered the focus will be shifted to uncovering its properties. Precision measurements of these parameters allow a deeper understanding of the electroweak symmetry-breaking mechanism. This presentation summarizes the latest results on the measurement of the Higgs boson mass, total width, production rates, couplings to bosons and fermions, and spin. With an integrated luminosity of 300 f b-l, ATLAS can measure various properties of the Higgs boson with high precision. The mass of the Higgs boson can be determined with an error of 0.1% - 1%, the width of the Higgs boson with an error of 10% - 20%, the production rates with 10% - 20%, the relative branching ratios with 15% - 45%, and the relative coupling ratios with 10% - 20%. For mH > 200 (230) GeV a Spin-0 CP-odd and a Spin-1 (CP-even and CP-odd) Higgs boson can be ruled out at 2σ (5 σ) level with an integrated luminosity of 100 f b-1