Search for flavour-changing neutral-current couplings between the top quark and the Higgs boson in multi-lepton final states in 13 TeV pp collisions with the ATLAS detector

ATLAS Collaboration [email protected]

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2 Scopus citations

Abstract

A search is presented for flavour-changing neutral-current interactions involving the top quark, the Higgs boson and an up-type quark (q=u,c) with the ATLAS detector at the Large Hadron Collider. The analysis considers leptonic decays of the top quark along with Higgs boson decays into two W bosons, two Z bosons or a τ+τ- pair. It focuses on final states containing either two leptons (electrons or muons) of the same charge or three leptons. The considered processes are tt¯ and Ht production. For the tt¯ production, one top quark decays via t→Hq. The proton–proton collision data set analysed amounts to (140fb-1) at (s=13TeV). No significant excess beyond Standard Model expectations is observed and upper limits are set on the t→Hq branching ratios at 95 % confidence level, amounting to observed (expected) limits of B(t→Hu)<2.8(3.0)×10-4 and B(t→Hc)<3.3(3.8)×10-4. Combining this search with other searches for tHq flavour-changing neutral-current interactions previously conducted by ATLAS, considering H→bb¯ and H→γγ decays, as well as H→τ+τ- decays with one or two hadronically decaying τ-leptons, yields observed (expected) upper limits on the branching ratios of B(t→Hu)<2.6(1.8)×10-4 and B(t→Hc)<3.4(2.3)×10-4.

Original languageEnglish
Article number757
JournalEuropean Physical Journal C
Volume84
Issue number7
DOIs
StatePublished - Jul 2024

Funding

FundersFunder number
BSF-NSF
Australian Research Council
DRAC
La Caixa Banking Foundation
Centre National pour la Recherche Scientifique et Technique
Fundação para a Ciência e a Tecnologia
European Union, Future Artificial Intelligence Research
Cooperative Research Centres, Australian Government Department of Industry
National Stroke Foundation
CEA-DRF
Science and Technology Facilities Council
Horizon 2020, ICSC-NextGenerationEU
H2020 Marie Skłodowska-Curie Actions
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Ministry of Science and Technology, Taiwan
Israel Science Foundation
Wallenberg Foundation
Leverhulme Trust
Baden-Württemberg Stiftung
PROMETEO
Neubauer Family Foundation
Staatssekretariat für Bildung, Forschung und Innovation
Javna Agencija za Raziskovalno Dejavnost RS
Generalitat de Catalunya
Instituto Nazionale di Fisica Nucleare
Bundesministerium für Wissenschaft, Forschung und Wirtschaft
Austrian Science Fund
Agencia Nacional de Investigación y Desarrollo
Bundesministerium für Bildung und Forschung
Helmholtz-Gemeinschaft
Danmarks Grundforskningsfond
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Canarie
Göran Gustafssons Stiftelser
MIZŠ
European Commission
Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja
U.S. Department of Energy
European Cooperation in Science and Technology
EU-ESF
International Council of Shopping Centers
RGC
Fundação de Amparo à Pesquisa do Estado de São Paulo
Institutul de Fizică Atomică
Natural Sciences and Engineering Research Council of Canada
Nella and Leon Benoziyo Center for Neurological Diseases, Weizmann Institute of Science
GenT Programmes Generalitat Valenciana, Spain
Irish Rugby Football Union
Cantons of Bern and Geneva
Chinese Academy of Sciences
Defence Science Institute
MNE
Agencia Nacional de Promoción Científica y Tecnológica
Royal Society
Minerva Foundation
National Research Foundation
Generalitat Valenciana
CERN
Ministerstvo Školství, Mládeže a Tělovýchovy
National Research Council Canada
Alexander von Humboldt-Stiftung
Multiple Sclerosis Scientific Research Foundation
Caring Futures Institute, Flinders University
British Columbia Knowledge Development Fund
Ministry of Education, Culture, Sports, Science and Technology
UNCESCI/013
Agence Nationale de la RechercheANR-20-CE31-0013, ANR-21-CE31-0013, ANR-21-CE31-0022
Norges ForskningsrådRCN-314472
Ministerio de Ciencia e InnovaciónNextGenEU-PCI2022-135018-2
CERN-CZ21/SCI/017
Investissements d’Avenir LabexANR-11-LABX-0012
Center for Advancing Research Impact in SocietyJ1-3010
European Research CouncilERC 101089007, ERC-948254
European Regional Development FundIDIFEDER/2018/048
Knut och Alice Wallenbergs StiftelseKAW 2022.0358, KAW 2018.0157, KAW 2017.0100, KAW 2018.0458, KAW 2019.0447
Deutsche ForschungsgemeinschaftDFG-469666862, DFG-CR 312/5-2
Japan Society for the Promotion of ScienceJP21H05085, JP22H04944, JP22H01227, JP22KK0227
DNSRCIN2P3-CNRS
Narodowa Agencja Wymiany AkademickiejPPN/PPO/2020/1/00002/U/00001
Norwegian Financial Mechanism2014-2021
VetenskapsrådetVR 2018-00482, 2021-03651, VR 2022-04683, VR 2022-03845
FAIR-NextGenerationEUPE00000013
National Natural Science Foundation of China12275265, PRIMUS/21/SCI/017, NSFC-12175119, NSFC-12075060
Fondo Nacional de Desarrollo Científico y Tecnológico1230987, 1230812, 1190886, 1210400
MICINFEDER-PID2021-125273NB, RYC2021-031273-I, RYC2022-038164-I, RYC2020-030254-I, RYC2019-028510-I
Narodowe Centrum NaukiUMO-2022/47/O/ST2/00148, UMO-2020/37/B/ST2/01043, UMO-2019/34/E/ST2/00393, 2021/42/E/ST2/00350, 2022/47/B/ST2/03059, UMO-2021/40/C/ST2/00187
GenT Programmes Generalitat ValencianaCIDEGENT/2019/023, CIDEGENT/2019/027
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen ForschungRPG-2020-004, SNSF-PCEFP2_194658, NIF-R1-231091
Horizon 2020 Framework ProgrammeMUCCA-CHIST-ERA-19-XAI-00
Fundación BBVALEO22-1-603

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