ATLAS Collaboration (Including: Beckingham, M., Ennis, Joseph Stanford, Farrington, Sinead, Harrison, P. F., Jelinskas, Adomas, Jeske, C., Martin, T. A., Murray, W., Pianori, E. and Spangenberg, Martin). (2017) Search for pair production of vector-like top quarks in events with one lepton, jets, and missing transverse momentum in s=13 TeV pp collisions with the ATLAS detector. Journal of High Energy Physics, 2017 (8). 52. doi:10.1007/jhep08(2017)052 ISSN 1029-8479.

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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(→νν) t + X decay channel. LHC pp collision data at a centre-of-mass energy of s=13 TeV recorded by the ATLAS detector in 2015 and 2016 are used, corresponding to an integrated luminosity of 36.1 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:	Journal Article
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
SWORD Depositor:	Library Publications Router
Journal or Publication Title:	Journal of High Energy Physics
Publisher:	Springer Berlin Heidelberg
ISSN:	1029-8479
Official Date:	16 August 2017
Dates:	Date Event 16 August 2017 Published 19 July 2017 Accepted
Volume:	2017
Number:	8
Article Number:	52
DOI:	10.1007/jhep08(2017)052
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	17 September 2018
Date of first compliant Open Access:	17 September 2018
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