Combined Upper Limit on Standard Model Higgs Boson Production at D0 in $p\bar{p}$ Collisions at $\sqrt{s}$=1.96 TeV

We present the combination of the searches for the Standard Model Higgs boson at a center-of-mass energy of $\sqrt{s}=$1.96~TeV, using up to 4~fb$^{-1}$ of data collected with the D0 detector at the Fermilab Tevatron collider. The major contributing processes include associated production ($WH\to l\nu bb$, $ZH\to\nu\nu bb$, $ZH\to ll bb$, and $WH\to WWW^{(*)}$) and gluon fusion ($gg\to H\to WW^{(*)}$). The significant improvements across the full mass range resulting from the larger data sets, improved analyses and inclusion of additional channels are discussed.