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- W3036616229 abstract "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 $tbar{t}$ 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 $tilde{t} to t^{(*)} tilde{chi}^0_1$, with $t^{(*)}$ denoting an on-shell (off-shell) top quark and $tilde{chi}^0_1$ the lightest neutralino. Three specific event selections are optimised for the following scenarios. In the scenario where $m_{tilde{t}}> m_t+m_{tilde{chi}^0_1}$, top squark masses are excluded in the range 400-1250 GeV for $tilde{chi}^0_1$ masses below $200$ GeV at 95 % confidence level. In the situation where $m_{tilde{t}}sim m_t+m_{tilde{chi}^0_1}$, top squark masses in the range 300-630 GeV are excluded, while in the case where $m_{tilde{t}}< m_W+m_b+m_{tilde{chi}^0_1}$ (with $m_{tilde{t}}-m_{tilde{chi}^0_1}ge 5$ 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." @default.
- W3036616229 created "2020-06-25" @default.
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