Measurements of H → WW^* decays and their impact on Higgs-boson parameters

The H → WW^* decay channel plays an essential role for establishing the Higgs mechanism and for determining the parameters of the model. This process had already contributed significantly to the discovery of the Higgs-boson in the 2012 ATLAS discovery paper. Since these days, the ATLAS collaboration has considerably improved the analysis methods in this decay channel, resulting in large improvements to the sensitivity. The new ATLAS H → WW^* results are presented, including evidence for the vector-boson-fusion production-process of the Higgs boson. Furthermore, their impact on our understanding of the Brout-Englert-Higgs sector of the Standard Model will be discussed.