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

The ATLAS collaboration

doi:10.1016/j.physletb.2018.03.023

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

The ATLAS collaboration

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

50 Scopus citations

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.

Original language	English
Pages (from-to)	557-577
Number of pages	21
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	780
DOIs	https://doi.org/10.1016/j.physletb.2018.03.023
State	Published - 10 May 2018

Funding

Funders	Funder number
Not added	ST/L001020/1, ST/K001310/1, ST/M006425/1, ST/N000447/1, ST/H001158/1, ST/K001426/1, ST/P00234X/1, ST/M00256X/1, ST/H001158/2, ST/K000837/1, ST/L001217/1
CEA-DSM
Cantons of Bern and Geneva
Czech Republic
DNSRC	IN2P3-CNRS
EU-ESF
IRFU
MES of Russia
MESTD
MIZŠ
MNE
MSMT
MSSR
RGC
Région Auvergne
VSC CR
Wallenberg Foundation
National Science Foundation	1624739
U.S. Department of Energy
Blowitz-Ridgeway Foundation
Bloom's Syndrome Foundation
Human Growth Foundation
Alexander von Humboldt-Stiftung
American Roentgen Ray Society
Society of Abdominal Radiology
California Department of Fish and Wildlife
Scientific Education and Research Institute
Appalachian Regional Commission
CRC Health Group
Ministry of Science and Technology
Departamento Administrativo de Ciencia, Tecnología e Innovación
Cummings Foundation
Ontario Innovation Trust
Canarie
National Research Council Sri Lanka
Türkiye Atom Enerjisi Kurumu
H2020 European Research Council
H2020 Marie Skłodowska-Curie Actions
Biomedical Research Foundation
Seventh Framework Programme
Arizona-Nevada Academy of Science
CERN
University of Washington College of Arts and Sciences
Iowa Science Foundation
Glycemic Index Foundation
Natural Sciences and Engineering Research Council of Canada
National Research Council Canada
Canada Council for the Arts
Canada Foundation for Innovation
Science and Technology Facilities Council	ST/J005509/1, GRIDPP, 1668509
Leverhulme Trust
Royal Society
European Research Council
Australian Research Council
National Stroke Foundation
Neurosurgical Research Foundation
Department of Science and Technology, Ministry of Science and Technology, India
Singapore Eye Research Institute
Helmholtz-Gemeinschaft
Minerva Foundation
Deutsche Forschungsgemeinschaft
Agence Nationale de la Recherche
Japan Society for the Promotion of Science
Ministry of Education, Culture, Sports, Science and Technology
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Danmarks Grundforskningsfond
German-Israeli Foundation for Scientific Research and Development
United States-Israel Binational Science Foundation
Fundação de Amparo à Pesquisa do Estado de São Paulo
National Natural Science Foundation of China
Fundação para a Ciência e a Tecnologia
Bundesministerium für Bildung und Forschung
Chinese Academy of Sciences
Austrian Science Fund
Generalitat de Catalunya
Comisión Nacional de Investigación Científica y Tecnológica
Agencia Nacional de Promoción Científica y Tecnológica
Fonds Québécois de la Recherche sur la Nature et les Technologies
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Ministerio de Economía y Competitividad
Generalitat Valenciana
Bundesministerium für Wissenschaft, Forschung und Wirtschaft
Ministry of Education and Science of the Russian Federation
General Secretariat for Research and Technology
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Joint Institute for Nuclear Research
Nella and Leon Benoziyo Center for Neurological Diseases, Weizmann Institute of Science
Israel Science Foundation
Instituto Nazionale di Fisica Nucleare
Max-Planck-Gesellschaft
Narodowe Centrum Nauki
Javna Agencija za Raziskovalno Dejavnost RS
Ministerstwo Nauki i Szkolnictwa Wyższego
Ministerstvo Průmyslu a Obchodu
Ministry of Science and Technology, Taiwan
Shota Rustaveli National Science Foundation
Israeli Centers for Research Excellence
Centre National pour la Recherche Scientifique et Technique
Bundesministerium für Bildung und Frauen
Horizon 2020
British Columbia Knowledge Development Fund
European Regional Development Fund
Strategic Research Council
Consejo Nacional de Innovación, Ciencia y Tecnología
Fundació Catalana de Trasplantament
Council on grants of the President of the Russian Federation
Fondation Partager le Savoir
National Research Center "Kurchatov Institute"
Institutul de Fizică Atomică

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10.1016/j.physletb.2018.03.023

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@article{dc597d6f72d54c5ab4ca44ae48c6b3bd,

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",

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.",

author = "{The ATLAS collaboration} and M. Aaboud and G. Aad and B. Abbott and O. Abdinov and B. Abeloos and Abidi, {S. H.} and AbouZeid, {O. S.} and Abraham, {N. L.} and H. Abramowicz and H. Abreu and R. Abreu and Y. Abulaiti and Acharya, {B. S.} and S. Adachi and L. Adamczyk and J. Adelman and M. Adersberger and T. Adye and Affolder, {A. A.} and Y. Afik and T. Agatonovic-Jovin and C. Agheorghiesei and Aguilar-Saavedra, {J. A.} and Ahlen, {S. P.} and F. Ahmadov and G. Aielli and S. Akatsuka and H. Akerstedt and {\AA}kesson, {T. P.A.} and E. Akilli and Akimov, {A. V.} and Alberghi, {G. L.} and J. Albert and P. Albicocco and {Alconada Verzini}, {M. J.} and Alderweireldt, {S. C.} and M. Aleksa and Aleksandrov, {I. N.} and G. Alexander and A. Ashkenazi and L. Barak and G. Bella and Y. Benhammou and T. Cao and E. Etzion and O. Kuprash and Lutz, {M. S.} and Y. Oren and M. Pitt and A. Soffer",

note = "Publisher Copyright: {\textcopyright} 2018 The Author(s)",

year = "2018",

month = may,

day = "10",

doi = "10.1016/j.physletb.2018.03.023",

language = "אנגלית",

volume = "780",

pages = "557--577",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

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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. / The ATLAS collaboration.
In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 780, 10.05.2018, p. 557-577.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - 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

AU - The ATLAS collaboration

AU - Aaboud, M.

AU - Aad, G.

AU - Abbott, B.

AU - Abdinov, O.

AU - Abeloos, B.

AU - Abidi, S. H.

AU - AbouZeid, O. S.

AU - Abraham, N. L.

AU - Abramowicz, H.

AU - Abreu, H.

AU - Abreu, R.

AU - Abulaiti, Y.

AU - Acharya, B. S.

AU - Adachi, S.

AU - Adamczyk, L.

AU - Adelman, J.

AU - Adersberger, M.

AU - Adye, T.

AU - Affolder, A. A.

AU - Afik, Y.

AU - Agatonovic-Jovin, T.

AU - Agheorghiesei, C.

AU - Aguilar-Saavedra, J. A.

AU - Ahlen, S. P.

AU - Ahmadov, F.

AU - Aielli, G.

AU - Akatsuka, S.

AU - Akerstedt, H.

AU - Åkesson, T. P.A.

AU - Akilli, E.

AU - Akimov, A. V.

AU - Alberghi, G. L.

AU - Albert, J.

AU - Albicocco, P.

AU - Alconada Verzini, M. J.

AU - Alderweireldt, S. C.

AU - Aleksa, M.

AU - Aleksandrov, I. N.

AU - Alexander, G.

AU - Ashkenazi, A.

AU - Barak, L.

AU - Bella, G.

AU - Benhammou, Y.

AU - Cao, T.

AU - Etzion, E.

AU - Kuprash, O.

AU - Lutz, M. S.

AU - Oren, Y.

AU - Pitt, M.

AU - Soffer, A.

PY - 2018/5/10

Y1 - 2018/5/10

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85044925674&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2018.03.023

DO - 10.1016/j.physletb.2018.03.023

M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???

AN - SCOPUS:85044925674

SN - 0370-2693

VL - 780

SP - 557

EP - 577

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

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

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