Search for $Wb\bar{b}$ and $WH$ production in $p\bar{p}$ collisions at $\sqrt s=1.96$ TeV

We present a study of $Wb\bar{b}$ production and a search for $WH$ production of the SM Higgs boson masses between 105 and 135 GeV in $p\bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV. The search is performed in events containing one election, an imbalance in the transverse enegy($E_T$) and two $b$-tagged jets in 400 $pb^{-1}$ of integrated luminosity accumulated collected by the D\O\ experiment at Fermilab.