Scalar Top Quark Search with Jets and Missing Momentum in pp Collisions at sqrt(s) = 7 TeV

A search for scalar top quarks is presented in final states with jets and missing transverse momentum. The data sample of proton--proton collisions used corresponds to an integrated luminosity of $4.98$ fb$^{-1}$ collected at $\sqrt{s} = 7$ TeV with the CMS detector at the LHC. The data is found to be in agreement with the predicted backgrounds. Exclusion limits are set in simplified models with the top squark decaying to an undetected particle and jets, either through an on-shell top quark, or through a chargino. For a massless undetected particle, we respectively exclude at 95 percent C.L. top squark masses between $295$ and $375$ GeV and between $280$ and $375$ GeV, the latter for a chargino at 75 percent of the top squark mass.