Search for a Supersymmetric Partner to the Top Quark in Final States with Jets and Missing Transverse Momentum at √s=7 TeV with the ATLAS Detector

A search for direct pair production of supersymmetric top squarks (~t1) is presented, assuming the ~t1 decays into a top quark and the lightest supersymmetric particle, ~01 , and that both top quarks decay to purely hadronic final states. A total of 16 (4) events are observed compared to a predicted standard model background of 13:5þ3:7 3:6ð4:4þ1:7 1:3Þ events in two signal regions based on RLdt ¼ 4:7 fb1 of pp collision data taken at ffiffiffi s p ¼ 7 TeV with the ATLAS detector at the LHC. An exclusion region in the ~t1 versus ~01 mass plane is evaluated: 370