Search for the SM Higgs in semi-leptonic WW* decays at Dzero

We present a search for the Standard Model Higgs boson produced via the~$H\rightarrow WW^{*} \rightarrow l \bar\nu jj$ process at a center-of-mass energy of $\sqrt{s}=1.96$ TeV using up to $5~fb^{-1}$ of data collected with the D\O~ detector at the Fermilab Tevatron collider. We search in events with one lepton (electron or muon), two jets and missing transverse energy. A Higgs particle with a mass greater than 140 GeV primarily decays into a pair of W bosons. While the di-lepton channels provide a cleaner signature, the semi-leptonic decay mode has a significantly larger cross section $\times$ branching ratio. Procedures used to identify signal-like events and to overcome the large W+jets background will be discussed.