A search for Wb$\rm\bar{b}$ and WH production in p$\rm\bar{p}$ collisions at $\rm\sqrt{s}$=1.96 TeV using 1f$\rm b^{-1}$ of data.

A search for Wb$\rm\bar{b}$ and WH production in p$\rm\bar{p}$ collisions at a center of mass energy of $\rm\sqrt{s}$ = 1.96 TeV is presented. Events containing one isolated electron, missing transverse energy and one or two b-tagged jets are considered. The integrated luminosity accumulated by the D$\O$ experiment at the Tevatron collider corresponds to 1.0{\rm fb$^{-1}$}. In the double b-tagged sample, good agreement between data and the Standard Model is achieved only when Wb$\rm\bar{b}$ production is included. Since we cannot establish its presence with high significance yet, we establish a 95\% C.L. upper limit on the Wb$\rm\bar{b}$ production cross section by requiring b jets with transverse momenta \rm{$p_T$} $>$ 20 GeV and a pseudorapidity $\eta <$ 2.5. The upper limit on WH production cross section is obtained by requiring additional selection on the b$\rm\bar{b}$ invariant mass to minimize Wb$\rm\bar{b}$ background contributions to the Higgs signal. Since its mass is unknown, Higgs masses in the range of 115 GeV/$\rm c^2$ to 155 GeV/$\rm c^2$ are scanned to establish the upper limit.