Searching for top squarks at the LHC in fully hadronic final state
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We pursue a scenario where the lighter top squark (stop) mass is accessible for the Large Hadron Collider in the near future, while gluinos and first two generation squarks are too heavy. At s=8TeV, we investigate the identification of stops which decay predominantly into a top quark and the stable lightest supersymmetric particle. We use a simple kinematical variable, M3, to reconstruct two top quarks which are pair-produced from the stops, in the fully hadronic channel. The dominant Standard Model background for this signal stems from tt plus jets, with one top quark decaying into bl, where the lepton is undetected and the produces missing transverse momentum. The lepton identification efficiency is thus crucial in order to estimate the background correctly. We identify kinematical variables to reduce the Standard Model background. We find that it is possible to achieve signal and background cross section at similar levels for stop masses around 300-500 GeV for a 10 mass of 100 GeV. 2012 American Physical Society.