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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

The ATLAS collaboration
No Journal Information, 2017

Abstract (data abstract)
CERN-LHC. The results of a search for vector-like top quarks using events with exactly one lepton, at least four jets, and large missing transverse momentum are reported. The search is optimised for pair production of vector-like top quarks in the $Z(\rightarrow \! \! \nu \nu) \, t + X$ decay channel. LHC \textit{pp} collision data at a centre-of-mass energy of $\sqrt{s}=13$ TeV recorded by the ATLAS detector in 2015 and 2016 are used, corresponding to an integrated luminosity of 36.1 $\mathrm{fb}^{-1}$. No significant excess over the Standard Model expectation is seen and upper limits on the production cross-section of a vector-like $T$ quark pair as a function of the $T$ quark mass are derived. The observed (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-isospin doublet model and 1.16 TeV (1.17 TeV) for the pure $Zt$ decay mode. Limits are also set on the mass as a function of the decay branching ratios, excluding large parts of the parameter space for masses below 1 TeV.

  • Table 1

    Data from Figure 6a.

    10.17182/hepdata.77266.v1/t1

    Expected and observed 95% CL upper limit on the cross-section times branching ratio for VLQ $T$ pair production as a...

  • Table 2

    Data from Figure 6b.

    10.17182/hepdata.77266.v1/t2

    Expected and observed 95% CL upper limit on the cross-section times branching ratio for VLQ $T$ pair production as a...

  • Table 3

    Data from Figure 6c.

    10.17182/hepdata.77266.v1/t3

    Expected and observed 95% CL upper limit on the cross-section times branching ratio for VLQ $T$ pair production as a...

  • Table 4

    Data from Figure 7a.

    10.17182/hepdata.77266.v1/t4

    Expected 95% CL lower limit on the VLQ $T$ mass as a function of the decay branching ratios into $W...

  • Table 5

    Data from Figure 7b.

    10.17182/hepdata.77266.v1/t5

    Observed 95% CL lower limit on the VLQ $T$ mass as a function of the decay branching ratios into $W...

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