Search for New Physics in multijet events with significant missing transverse energy using b-tagging

We present a search for physics beyond the Standard Model based on events with significant missing transverse energy, at least three jets, and at least one identified b-jet. The b-jets plus MET sample presents a unique topological signature for a model-independent analysis, which complements those of leptons+jets+MET and jets+MET without b-tagging. The study is based on a sample of 36 pb$^{-1}$ collected with the CMS detector in $pp$ collisions at $\sqrt{s} = 7$~TeV. We show the implications of our background determination estimates using data-driven methods, and set model-independent limits for anomalous signatures.