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Search for flavour-changing neutral-current interactions of a top quark and a gluon in pp collisions at s√=13 TeV with the ATLAS detector

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ATLAS Collaboration (Including: Becker, K., Facini, G., Harrison, P. F., Jones, E. A. (Elizabeth A.), Martin, T. A., Morgenstern, S., Murray, W., Roberts, B. A., Spangenberg, Martin and Vladimirov, V. E.). (2022) Search for flavour-changing neutral-current interactions of a top quark and a gluon in pp collisions at s√=13 TeV with the ATLAS detector. The European Physical Journal C, 82 . 334 . doi:10.1140/epjc/s10052-022-10182-7 ISSN 1434-6044.

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Official URL: https://doi.org/10.1140/epjc/s10052-022-10182-7

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Abstract

A search is presented for the production of a single top quark via left-handed flavour-changing neutral-current (FCNC) interactions of a top quark, a gluon and an up or charm quark. Two production processes are considered: u+g→t and c+g→t. The analysis is based on proton–proton collision data taken at a centre-of-mass energy of 13 TeV with the ATLAS detector at the LHC. The data set corresponds to an integrated luminosity of 139 fb−1. Events with exactly one electron or muon, exactly one b-tagged jet and missing transverse momentum are selected, resembling the decay products of a singly produced top quark. Neural networks based on kinematic variables differentiate between events from the two signal processes and events from background processes. The measured data are consistent with the background-only hypothesis, and limits are set on the production cross-sections of the signal processes: σ(u+g→t)×B(t→Wb)×B(W→ℓν)<3.0pb and σ(c+g→t)×B(t→Wb)×B(W→ℓν)<4.7pb at the 95% confidence level, with B(W→ℓν)=0.325 being the sum of branching ratios of all three leptonic decay modes of the W boson. Based on the framework of an effective field theory, the cross-section limits are translated into limits on the strengths of the tug and tcg couplings occurring in the theory: |CutuG|/Λ2<0.057TeV−2 and |CctuG|/Λ2<0.14TeV−2. These bounds correspond to limits on the branching ratios of FCNC-induced top-quark decays: B(t→u+g)<0.61×10−4 and B(t→c+g)<3.7×10−4.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Quark-gluon plasma , Nuclear matter , Proton-proton interactions
Journal or Publication Title: The European Physical Journal C
Publisher: Springer
ISSN: 1434-6044
Official Date: 19 April 2022
Dates:
DateEvent
19 April 2022Published
4 March 2022Accepted
Volume: 82
Article Number: 334
DOI: 10.1140/epjc/s10052-022-10182-7
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 25 May 2022
Date of first compliant Open Access: 25 May 2022
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDAgencia Nacional de Promoción Científica y Tecnológica (Argentina)http://viaf.org/viaf/170772522
UNSPECIFIEDErewani Fizikayi Institowthttp://viaf.org/viaf/246145857074422921586
UNSPECIFIEDAustralian Research Councilhttp://dx.doi.org/10.13039/501100000923
UNSPECIFIEDBundesministerium für Wissenschaft, Forschung und WirtschaftUNSPECIFIED
UNSPECIFIEDAustrian Science Fundhttp://dx.doi.org/10.13039/501100002428
UNSPECIFIEDAzərbaycan Milli Elmlər AkademiyasıUNSPECIFIED
UNSPECIFIEDBelarus. Gosudarstvennyĭ komitet po nauke i tekhnologii︠a︡mhttp://viaf.org/viaf/154732294
UNSPECIFIEDConselho Nacional de Desenvolvimento Científico e Tecnológicohttp://dx.doi.org/10.13039/501100003593
UNSPECIFIEDFundação de Amparo à Pesquisa do Estado de São PauloUNSPECIFIED
UNSPECIFIED[NSERC] Natural Sciences and Engineering Research Council of Canadahttp://dx.doi.org/10.13039/501100000038
UNSPECIFIED[NRC] National Research Council Canadahttp://dx.doi.org/10.13039/501100000046
UNSPECIFIED[CFI] Canada Foundation for Innovationhttp://dx.doi.org/10.13039/501100000196
UNSPECIFIEDCERNhttp://dx.doi.org/10.13039/100012470
UNSPECIFIEDAgencia Nacional de Investigación e Innovaciónhttp://dx.doi.org/10.13039/100008725
UNSPECIFIEDChinese Academy of Scienceshttps://english.cas.cn/
UNSPECIFIEDMinistry of Science and Technology of the People's Republic of Chinahttp://dx.doi.org/10.13039/501100002855
UNSPECIFIED[NSFC] National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809
UNSPECIFIEDMincienciashttps://minciencias.gov.co/
UNSPECIFIEDCzech Republic.‏ ‎Ministerstvo školství, mládeže a tělovýchovyhttp://viaf.org/viaf/312885350
UNSPECIFIEDČesko.‏ ‎Ministerstvo průmyslu a obchodu.‏ ‎Odbor strukturálních fondůhttp://viaf.org/viaf/141216211
UNSPECIFIEDDanmarks Grundforskningsfondhttp://dx.doi.org/10.13039/501100001732
UNSPECIFIED[CEA] Commissariat à l'Énergie Atomique et aux Énergies Alternativeshttp://dx.doi.org/10.13039/501100006489
UNSPECIFIEDShota Rustaveli National Science Foundation of Georgiahttps://rustaveli.org.ge/eng
UNSPECIFIEDBundesministerium für Bildung und Forschunghttp://dx.doi.org/10.13039/501100002347
UNSPECIFIEDHelmholtz-Gemeinschafthttp://dx.doi.org/10.13039/501100001656
UNSPECIFIEDMax-Planck-Gesellschafthttp://dx.doi.org/10.13039/501100004189
UNSPECIFIEDGeneral Secretariat for Research and Innovationhttps://gsri.gov.gr/en/
UNSPECIFIEDResearch Grants Council, University Grants Committeehttp://dx.doi.org/10.13039/501100002920
UNSPECIFIEDIsrael Science Foundationhttp://dx.doi.org/10.13039/501100003977
UNSPECIFIEDWeizmann Institute of Sciencehttp://dx.doi.org/10.13039/501100001735
UNSPECIFIED[INFN] Instituto Nazionale di Fisica Nuclearehttp://dx.doi.org/10.13039/501100004007
UNSPECIFIED[MEXT] Ministry of Education, Culture, Sports, Science and Technologyhttp://dx.doi.org/10.13039/501100001700
UNSPECIFIED[JSPS] Japan Society for the Promotion of Sciencehttp://dx.doi.org/10.13039/501100001691
UNSPECIFIEDCentre National pour la Recherche Scientifique et Techniquehttp://dx.doi.org/10.13039/501100006319
UNSPECIFIED[NWO] Nederlandse Organisatie voor Wetenschappelijk Onderzoekhttp://dx.doi.org/10.13039/501100003246
UNSPECIFIEDNorges Forskningsrådhttp://dx.doi.org/10.13039/501100005416
UNSPECIFIEDPoland. Ministerstwo Edukacji i Naukihttp://viaf.org/viaf/235252512
UNSPECIFIEDFundação para a Ciência e a TecnologiaUNSPECIFIED
UNSPECIFIEDInstitutul de Fizică AtomicăUNSPECIFIED
UNSPECIFIEDJoint Institute for Nuclear Researchhttp://dx.doi.org/10.13039/501100003822
UNSPECIFIEDSoviet Union. Ministerstvo vysshego i srednego spet︠s︡ialʹnogo obrazovanii︠a︡http://viaf.org/viaf/132332564
UNSPECIFIEDNational Research Center "Kurchatov Institute"http://dx.doi.org/10.13039/501100013400
UNSPECIFIEDSerbia. Ministarstvo prosvete, nauke i tehnološkog razvojahttp://viaf.org/viaf/8671152381810201950000
UNSPECIFIEDPrávnický ústav Ministerstva spravodlivosti SRhttp://viaf.org/viaf/128552088
UNSPECIFIEDJavna Agencija za Raziskovalno Dejavnost RShttp://dx.doi.org/10.13039/501100004329
UNSPECIFIEDSlovinsko.‏ ‎Ministrstvo za izobraževanje, znanost in športhttp://viaf.org/viaf/642163874292545722289
UNSPECIFIEDNational Research Foundationhttp://dx.doi.org/10.13039/501100001321
UNSPECIFIEDMinisterio de Ciencia e Innovaciónhttp://dx.doi.org/10.13039/501100004837
UNSPECIFIEDVetenskapsrådethttp://dx.doi.org/10.13039/501100004359
UNSPECIFIEDMarianne and Marcus Wallenberg Foundationhttp://dx.doi.org/10.13039/501100011898
UNSPECIFIED[SERI] Staatssekretariat für Bildung, Forschung und Innovationhttp://dx.doi.org/10.13039/501100007352
UNSPECIFIED[SNSF] Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschunghttp://dx.doi.org/10.13039/501100001711
UNSPECIFIEDMinistry of Science and Technology, Taiwanhttp://dx.doi.org/10.13039/501100004663
UNSPECIFIEDTurkiye Atom Enerjisi KurumuUNSPECIFIED
UNSPECIFIED[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
UNSPECIFIED[DOE] U.S. Department of Energyhttp://dx.doi.org/10.13039/100000015
UNSPECIFIED[NSF] National Science Foundation (US)http://dx.doi.org/10.13039/100000001
UNSPECIFIEDEuropean Cooperation in Science and Technologyhttp://dx.doi.org/10.13039/501100000921
UNSPECIFIEDEuropean Research Councilhttp://dx.doi.org/10.13039/501100000781
UNSPECIFIED[ERDF] European Regional Development Fundhttp://dx.doi.org/10.13039/501100008530
UNSPECIFIEDHorizon 2020 Framework Programmehttp://dx.doi.org/10.13039/100010661
UNSPECIFIEDH2020 Marie Skłodowska-Curie Actionshttp://dx.doi.org/10.13039/100010665
UNSPECIFIEDRoyal Societyhttp://dx.doi.org/10.13039/501100000288
UNSPECIFIEDLeverhulme Trusthttp://dx.doi.org/10.13039/501100000275
UNSPECIFIEDInstitut National de Physique Nucléaire et de Physique des Particuleshttp://dx.doi.org/10.13039/501100012441
UNSPECIFIED[CNRS] Centre National de la Recherche Scientifiquehttp://dx.doi.org/10.13039/501100004794

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