Higgs Boson Searches in Gluon Fusion and Vector Boson Fusion using the H to WW Decay Mode.

The prospects for Higgs searches in the H + 0j (H to WW to e-nu mu-nu ), H + 2j (H to WW to e-nu mu-nu ), and H + 2 j (H to WW to l-nu qq) channels at ATLAS are presented, including realistic effects such as trigger efficiencies and detector misalignment, with an emphasis on practical methods to estimate the backgrounds using control samples in data. With 10 fb−1 of integrated luminosity, one would expect to be able to discover a Standard Model Higgs boson in the mass range 135 < mH < 190 GeV and to be able to measure its mass with a precision of about 7 GeV if its true mass is 130 GeV or about 2 GeV if its true mass is 160 GeV.