Measurement of the production cross-section of a single top quark in association with a Z boson in proton-proton collisions at 13 TeV 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 2890 more authors) (2018) Measurement of the production cross-section of a single top quark in association with a Z boson in proton-proton collisions at 13 TeV with the ATLAS detector. PHYSICS LETTERS B, 780. pp. 557-577.

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Abstract

The production of a top quark in association with a $Z$ boson is investigated. The proton--proton collision data collected by the ATLAS experiment at the LHC in 2015 and 2016 at a centre-of-mass energy of $\sqrt{s} = 13 \mathrm{TeV}$ are used, corresponding to an integrated luminosity of $36.1 \mathrm{fb}^{-1}$. Events containing three identified leptons (electrons and/or muons) and two jets, one of which is identified as a $b$-quark jet are selected. The major backgrounds are diboson, $t\bar{t}$ and $Z\mathrm{+jets}$ production. A neural network is used to improve the background rejection and extract the signal. The resulting significance is $4.2\sigma$ in the data and the expected significance is $5.4\sigma$. The measured cross-section for $tZq$ production is $600 \pm 170 \mathrm{(stat.)} \pm 140 \mathrm{(syst.)} \mathrm{fb}$.

Item Type: Article
Additional Information: 35 pages in total, author list starting page 19, 4 figures, 4 tables, submitted to Phys. Lett. B., All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2016-14/
Uncontrolled Keywords: SM, Single top, Cross section, tZq
Depositing User: Symplectic Admin
Date Deposited: 04 Jun 2019 08:03
Last Modified: 19 Jan 2023 00:43
DOI: 10.1016/j.physletb.2018.03.023
Open Access URL: https://www.sciencedirect.com/science/article/pii/...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3042452

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