Abstract
A search for pair production of a scalar partner of the top quark in events with four or more jets plus missing transverse momentum is presented. An analysis of 36.1 fb−1 of sqrt{s}=13 TeV proton-proton collisions collected using the ATLAS detector at the LHC yields no significant excess over the expected Standard Model background. To interpret the results a simplified supersymmetric model is used where the top squark is assumed to decay via {tilde{t}}_1to {t}^{left(ast right)}{tilde{upchi}}_1^0 and {tilde{t}}_1to b{tilde{upchi}}_1^{pm}to b{W}^{left(ast right)}{tilde{upchi}}_1^0 , where χ10(χ1±) denotes the lightest neutralino (chargino). Exclusion limits are placed in terms of the top-squark and neutralino masses. Assuming a branching ratio of 100% to t{tilde{upchi}}_1^0 , top-squark masses in the range 450–1000 GeV are excluded for {tilde{upchi}}_1^0 masses below 160 GeV. In the case where {m}_{{tilde{t}}_1}sim {m}_t+{m}_{{tilde{chi}}_1^0} , top-squark masses in the range 235–590 GeV are excluded.
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