Search for a supersymmetric partner to the top quark in final states with jets and missing transverse momentum at $\sqrt{s}=7$ TeV with the ATLAS detector

Tanasijczuk, Andres Jorge;ATLAS;et.al.
(2012) Physical Review Letters — Vol. 109 (2012)

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Abstract
A search for direct pair production of supersymmetric top squarks (stop_1) is presented, assuming the stop_1 decays into a top quark and the lightest supersymmetric particle, neutralino_1, 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 13.5+3.7-3.6 (4.4+1.7-1.3) events in two signal regions based on int(Ldt) = 4.7 fb^-1 of pp collision data taken at sqrt(s) = 7 TeV with the ATLAS detector at the LHC. An exclusion region in the stop_1 versus neutralino_1 mass plane is evaluated: 370<m(stop_1)<465 GeV is excluded for m(neutralino_1)~0 GeV while m(stop_1)=445 GeV is excluded for m(neutralino_1)<=50 GeV.
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Tanasijczuk, A. J., ATLAS, & et al. (2012). Search for a supersymmetric partner to the top quark in final states with jets and missing transverse momentum at $\sqrt{s}=7$ TeV with the ATLAS detector. Physical Review Letters, 109. https://doi.org/10.1103/PhysRevLett.109.211802 (Original work published 2012)