SEARCH FOR THE STANDARD MODEL HIGGS BOSON PRODUCTION AND DECAY TO W BOSON PAIRS USING THE LEPTON + MET + JETS CHANNEL USING 4.7 $fb^{-1}$ OF DATA RECORDED BY THE ATLAS DETECTOR AT $\sqrt{s} =$ 7 TEV PROTON-PROTON COLLISION

Abstract

A search for the Standard Model Higgs boson decaying to two W bosons with the subsequent decay to a final state containing one lepton, one neutrino, and two (or three) jets ($H\rightarrow WW^{*}\rightarrow\ell\nu jj$ where $\ell$ stands for electron or muon) is presented using 4.7~fb$^{-1}$ of data recorded by the ATLAS detector in 2011 at center of mass energy $\sqrt{s} =$ 7~TeV. No significant excess is observed over the expected Standard Model background. Limits on the Higgs production cross section are derived for masses between $\mH$ = 300 GeV and $\mH$ = 600 GeV. For a Higgs boson mass $\mH$ = 400~GeV, the 95% confidence level upper bound on the cross-section for Higgs boson production by gluon fusion times the branching ratio for $H\rightarrow WW^{*}$ is 2.2 pb, or approximately 1.9 times the Standard Model prediction.