Search for a SM Higgs Boson in the all-hadronic decay channel at CDF

We present a search for the standard model (SM) Higgs boson in the $VH \rightarrow qq' b\bar{b}$ ($V = W$,$Z$) and $Hqq' \rightarrow b\bar{b} qq'$ (vector boson fusion) production modes using 4fb$^{-1}$ of $p\bar{p}$ collisions recorded with the CDF detector. These channels contain significant acceptance from a potential signal as a result of the large hadronic branching ratios for the $W$ and $Z$ bosons. However, the analysis of this channel is difficult due to the presence of very large multi-jet backgrounds. The most recent result in this channels which is presented here yields a factor of two improvement over the previous 2fb$^{-1}$ analysis. We describe new techniques used for data-based modelling of the multi-jet backgrounds and for incorporating jet shapes to suppress some of these backgrounds.