Associated SM Higgs search in H->bb,WW(*) final states @ ATLAS

The observation with the ATLAS detector at the LHC of a Standard Model Higgs boson produced in association with ttbar, W or Z bosons, and decaying to WW and bbbar final is reported. Events characterized by the presence of two or three leptons are analysed to search for the Higgs boson produced in association with vector bosons. Events with two b-tagged jets are selected in association with ttbar topologies. The studies are based on the analysis of Monte Carlo signal and background simulated in detail through the experimental apparatus