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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, S. H. ; Åkesson, Torsten LU orcid ; Bocchetta, Simona LU ; Doglioni, Caterina LU and Hedberg, Vincent LU , et al. (2018) In Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 780. p.557-577
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 s=13TeV are used, corresponding to an integrated luminosity of 36.1fb−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, tt¯ and Z+jets production. A neural network is used to improve the background rejection and extract the signal. The resulting significance is 4.2σ in the data and the expected significance is 5.4σ. The measured cross-section for tZq production is 600±170(stat.)±140(syst.)fb. © 2018 The Author(s)
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type
Contribution to journal
publication status
published
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in
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
780
pages
21 pages
publisher
Elsevier
external identifiers
  • scopus:85044925674
ISSN
0370-2693
DOI
10.1016/j.physletb.2018.03.023
language
English
LU publication?
yes
additional info
Export Date: 17 April 2018
id
b8e38ec9-d67f-4884-9def-156111400bee
alternative location
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85044925674&doi=10.1016%2fj.physletb.2018.03.023&partnerID=40&md5=21e621d5b596953979cee22250a916fa
date added to LUP
2018-04-17 14:05:39
date last changed
2023-04-08 10:43:45
@article{b8e38ec9-d67f-4884-9def-156111400bee,
  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 s=13TeV are used, corresponding to an integrated luminosity of 36.1fb−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, tt¯ and Z+jets production. A neural network is used to improve the background rejection and extract the signal. The resulting significance is 4.2σ in the data and the expected significance is 5.4σ. The measured cross-section for tZq production is 600±170(stat.)±140(syst.)fb. © 2018 The Author(s)}},
  author       = {{Aaboud, M and Aad, G and Abbott, B. and Abdinov, O and Abeloos, B and Abidi, S. H. and Åkesson, Torsten and Bocchetta, Simona and Doglioni, Caterina and Hedberg, Vincent and Jarlskog, Göran and Kalderon, Charles and Kellermann, Edgar and Konya, Balazs and Lytken, Else and Mankinen, Katja and Mjörnmark, Ulf and Pöttgen, Ruth and Poulsen, Trine and Smirnova, Oxana and Viazlo, Oleksandr}},
  issn         = {{0370-2693}},
  language     = {{eng}},
  month        = {{05}},
  pages        = {{557--577}},
  publisher    = {{Elsevier}},
  series       = {{Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics}},
  title        = {{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}},
  url          = {{http://dx.doi.org/10.1016/j.physletb.2018.03.023}},
  doi          = {{10.1016/j.physletb.2018.03.023}},
  volume       = {{780}},
  year         = {{2018}},
}