Search for a Standard Model Higgs boson in the $WH\to \tau\nu b \bar{b}$ channel with 4.0 fb$^{-1}$ at D0

We present a search for a low mass ($m_H<135$~GeV) Standard Model Higgs boson in a 4.0~fb$^{-1}$ dataset of proton antiproton collisions at 1.96~TeV center-of-mass energy, recorded by the D0 detector at the Tevatron collider. This search was specifically aimed at the Higgs boson decaying to a $b-\overline{b}$ pair, with an associated $W$ boson which decays into a hadronically decaying tau and a tau-neutrino. We require large missing transverse energy, a jet identified as a hadronic tau and to optimize acceptance, we require only loose $b$ identification requirements on two jets, or one jet with tight $b$ identification requirements. This analysis was done using Boosted Decision Trees and in the end a limit was set on Standard Model Higgs boson production.