Search for supersymmetry in all-hadronic events with missing energy

A search for new physics is presented based on an event signature of at least three jets accompanied by large missing transverse momentum, using a data sample corresponding to an integrated luminosity of $\fulllumi \fbinv$ collected in proton--proton collisions at $\sqrt{s}=7\TeV$ with the CMS detector at the LHC. No excess of events is observed above the expected standard model backgrounds, which are all estimated from the data. Exclusion limits are presented for the constrained minimal supersymmetric extension of the standard model.