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 √ 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 t1 → t(∗)χ 01 and t1 → bχ ±1 → bW(∗)χ 01, where χ01 (χ ±1 ) 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 tχ 01, top-squark masses in the range 450−1000 GeV are excluded for χ 01 masses below 160 GeV. In the case where mt1 ∼ mt + mχ 01, top-squark masses in the range 235−590 GeV are excluded.
|Original language||English (US)|
|State||Published - Sep 13 2017|
ASJC Scopus subject areas