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The results of a search for pair production of light top squarks arepresented, using 4.7 fb^-1 of sqrt(s) = 7 TeV proton-proton collisionscollected with the ATLAS detector at the Large Hadron Collider. This searchtargets top squarks with masses similar to, or lighter than, the top quarkmass. Final states containing exclusively one or two leptons (e, mu), largemissing transverse momentum, light-jets and b-jets are used to reconstruct thetop squark pair system. Global mass scale variables are used to separate thesignal from a large ttbar background. No excess over the Standard Modelexpectations is found. The results are interpreted in the framework of theMinimal Supersymmetric Standard Model, assuming the top squark decaysexclusively to a chargino and a b-quark. Light top squarks with masses between123-167 GeV are excluded for neutralino masses around 55 GeV.

physics letters b

Search for light top squark pair production in final states with leptons  and b-jets with the ATLAS detector in sqrt(s) = 7 TeV proton-proton  collisions