Search for a scalar partner of the top quark in the all-hadronic ttbar plus missing transverse momentum final state at sqrt(s) = 13 TeV with the ATLAS detector

A search for direct pair production of scalar partners of the top quark (top squarks or scalar third-generation up-type leptoquarks) in the all-hadronic t¯t plus missing transverse momentum final state is presented. The analysis of 139 fb−1 of sqrt(s) = 13 TeV proton–proton collision data collected using the ATLAS detector at the LHC yields no significant excess over the Standard Model background expectation. To interpret the results, a supersymmetric model is used where the top squark decays via ˜t → t(∗) ˜χ 01 , with t(∗) denoting an on-shell (off-shell) top quark and ˜χ 01 the lightest neutralino. Three specific event selections are optimised for the following scenarios. In the scenario where m˜t > mt + m ˜χ01, top squark masses are excluded in the range 400–1250 GeV for ˜χ 01 masses below 200 GeV at 95% confidence level. In the situation where m˜t ∼ mt +m ˜χ 01, top squarkmasses in the range 300–630 GeV are excluded, while in the case where m˜t < mW + mb + m ˜χ 01 (with m˜t − m ˜χ 01 ≥ 5 GeV), considered for the first time in an ATLAS all-hadronic search, top squark masses in the range 300–660 GeV are excluded. Limits are also set for scalar third-generation up-type leptoquarks, excluding leptoquarks with masses below 1240 GeV when considering only leptoquark decays into a top quark and a neutrino.