Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/129412
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Type: Journal article
Title: Observation of the associated production of a top quark and a Z boson in pp collisions at √s = 13 TeV with the ATLAS detector
Other Titles: Observation of the associated production of a top quark and a Z boson in pp collisions at root s = 13 TeV with the ATLAS detector
Author: Aad, G.
Abbott, B.
Abbott, D.C.
Abed Abud, A.
Abeling, K.
Abhayasinghe, D.K.
Abidi, S.H.
AbouZeid, O.S.
Abraham, N.L.
Abramowicz, H.
Abreu, H.
Abulaiti, Y.
Acharya, B.S.
Achkar, B.
Adachi, S.
Adam, L.
Adam Bourdarios, C.
Adamczyk, L.
Adamek, L.
Adelman, J.
et al.
Citation: The Journal of High Energy Physics, 2020; 2020(7):(i)1-45
Publisher: Springer Nature
Issue Date: 2020
ISSN: 1126-6708
1029-8479
Statement of
Responsibility: 
G. Aad … D. Duvnjak … P. Jackson … A.X.Y. Kong … J.L. Oliver … A. Petridis … A. Qureshi … A.S. Sharma … M.J. White … et al. [The ATLAS Collaboration]
Abstract: Single top-quark production in association with a Z boson, where the Z boson decays to a pair of charged leptons, is measured in the trilepton channel. The proton-proton collision data collected by the ATLAS experiment from 2015 to 2018 at a centre-of-mass energy of 13 TeV are used, corresponding to an integrated luminosity of 139 fb⁻¹. Events containing three isolated charged leptons (electrons or muons) and two or three jets, one of which is identified as containing a b-hadron, are selected. The main backgrounds are from tt¯Z and diboson production. Neural networks are used to improve the background rejection and extract the signal. The measured cross-section for tℓ⁺ℓ⁻q production, including non-resonant dilepton pairs with m(ℓ)+(ℓ)− > 30 GeV, is 97 ± 13 (stat.) ± 7 (syst.) fb, consistent with the Standard Model prediction
Keywords: Hadron-hadron scattering (experiments)
Rights: Copyright CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP³. Open Access. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
DOI: 10.1007/JHEP07(2020)124
Grant ID: ARC
Published version: http://dx.doi.org/10.1007/jhep07(2020)124
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