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The results of a search for vector-like top quarks using events with exactlyone lepton, at least four jets, and large missing transverse momentum arereported. The search is optimised for pair production of vector-like top quarksin the $Z(\rightarrow \! \! \nu \nu) \, t + X$ decay channel. LHC pp collisiondata at a centre-of-mass energy of $\sqrt{s}=13$ TeV recorded by the ATLASdetector in 2015 and 2016 are used, corresponding to an integrated luminosityof 36.1 $\mathrm{fb}^{-1}$. No significant excess over the Standard Modelexpectation is seen and upper limits on the production cross-section of avector-like $T$ quark pair as a function of the $T$ quark mass are derived. Theobserved (expected) 95% CL lower limits on the $T$ mass are 870 GeV (890 GeV)for the weak-isospin singlet model, 1.05 TeV (1.06 TeV) for the weak-isospindoublet model and 1.16 TeV (1.17 TeV) for the pure $Zt$ decay mode. Limits arealso set on the mass as a function of the decay branching ratios, excludinglarge parts of the parameter space for masses below 1 TeV.

the journal of high energy physics/the journal of high energy physics

Search for pair production of vector-like top quarks in events with one  lepton, jets, and missing transverse momentum in $\sqrt{s} = 13$ TeV pp  collisions with the ATLAS detector