Search for H->WW Based on Boosted Decision Trees

The search for H->WW with ATLAS detector based on Boosted Decision Trees has been reported. Boosted Decision Trees (BDT) multivariate pattern recognition technique is employed to improve the Higgs detection efficiency and sensitivity. The early discovery for the SM Higgs through the W-pair leptonic decay mode could be achieved by using the first few fb^{-1} integrated luminosity if Higgs boson mass is between 140 and 180 GeV. If Higgs mass is around 160-170 GeV, a 5 sigma detection significance can be achieved with less than 1 fb^{-1} integrated luminosity in H->WW production.