Search for pair production of vector-like top quarks in events with one lepton, jets, and missing transverse momentum in <i>√S</i>=13 TeV <i>pp</i> collisions with the ATLAS detector



Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H
et al (show 2848 more authors) (2017) Search for pair production of vector-like top quarks in events with one lepton, jets, and missing transverse momentum in <i>√S</i>=13 TeV <i>pp</i> collisions with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2017 (8). pp. 1-40.

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Abstract

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 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.

Item Type: Article
Additional Information: 39 pages in total, author list starting page 23, 7 figures, 5 tables, submitted to JHEP, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2016-15/
Uncontrolled Keywords: Exotics, Hadron-Hadron scattering (experiments), vector-like quarks
Depositing User: Symplectic Admin
Date Deposited: 08 Sep 2017 11:46
Last Modified: 11 Oct 2023 05:26
DOI: 10.1007/JHEP08(2017)052
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3009353