

A search for a new pseudoscalar Formula Presented-boson produced in events with a top-quark pair, where the Formula Presented-boson decays into a pair of muons, is performed using Formula Presented Formula Presented collision data collected with the ATLAS detector at the LHC, corresponding to an integrated luminosity of Formula Presented. The search targets the final state where only one top quark decays to an electron or muon, resulting in a signature with three leptons Formula Presented and Formula Presented. No significant excess of events above the Standard Model expectation is observed and upper limits are set on two signal models: Formula Presented and Formula Presented with Formula Presented, Formula Presented, where Formula Presented, in the mass ranges Formula Presented and Formula Presented. © 2023 CERN, for the ATLAS Collaboration.
| Funding sponsor | Funding number | Acronym |
|---|---|---|
| IN2P3-CNRS | ||
| CC-IN2P3 | ||
| 2014-2021 | ||
| SCI/013 | ||
| U.S. Department of Energy See opportunities by USDOE | USDOE | |
| Alexander von Humboldt-Stiftung See opportunities by AvH | AvH | |
| Brookhaven National Laboratory See opportunities by BNL | BNL | |
| CRC Health Group | 21/SCI/017 | CRC |
| CRC Health Group | CRC | |
| Canarie | ||
| Karlsruhe Institute of Technology | KIT | |
| H2020 Marie Skłodowska-Curie Actions See opportunities by MSCA | MSCA | |
| Multiple Sclerosis Scientific Research Foundation | MSSRF | |
| CERN | ||
| Compute Canada | ||
| Göran Gustafssons Stiftelser | ||
| Natural Sciences and Engineering Research Council of Canada See opportunities by NSERC | NSERC | |
| National Research Council Canada See opportunities by NRC | NRC | |
| Canada Foundation for Innovation | CFI | |
| Science and Technology Facilities Council See opportunities by STFC | STFC | |
| Leverhulme Trust See opportunities | ||
| European Research Council | ERC | |
| European Cooperation in Science and Technology | COST | |
| Australian Research Council See opportunities by ARC | ARC | |
| National Stroke Foundation | NSF | |
| Neurosurgical Research Foundation | NRF | |
| Helmholtz-Gemeinschaft See opportunities by HGF | HGF | |
| Minerva Foundation | ||
| Deutsche Forschungsgemeinschaft See opportunities by DFG | DFG | |
| Agence Nationale de la Recherche See opportunities by ANR | ANR | |
| Japan Society for the Promotion of Science See opportunities by JSPS | JSPS | |
| Ministry of Education, Culture, Sports, Science and Technology | MEXT | |
| Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung See opportunities by SNF | SNF | |
| Danmarks Grundforskningsfond | DNRF | |
| Fundação de Amparo à Pesquisa do Estado de São Paulo See opportunities by FAPESP | FAPESP | |
| National Natural Science Foundation of China | NSFC | |
| Ministerstvo Školství, Mládeže a Tělovýchovy | MŠMT | |
| Fundação para a Ciência e a Tecnologia See opportunities by FCT | FCT | |
| Bundesministerium für Bildung und Forschung | BMBF | |
| Chinese Academy of Sciences | CAS | |
| Austrian Science Fund | FWF | |
| Generalitat de Catalunya | ||
| Ministry of Science and Technology of the People's Republic of China | MOST | |
| Agencia Nacional de Promoción Científica y Tecnológica | ANPCyT | |
| Nederlandse Organisatie voor Wetenschappelijk Onderzoek | NWO | |
| Bundesministerium für Wissenschaft, Forschung und Wirtschaft | BMWFW | |
| Conselho Nacional de Desenvolvimento Científico e Tecnológico | CNPq | |
| Nella and Leon Benoziyo Center for Neurological Diseases, Weizmann Institute of Science | ||
| Israel Science Foundation | ISF | |
| Instituto Nazionale di Fisica Nucleare | INFN | |
| Narodowe Centrum Nauki | NCN | |
| Javna Agencija za Raziskovalno Dejavnost RS | ARRS | |
| Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja | MPNTR | |
| Ministerio de Ciencia e Innovación | MICINN | |
| Centre National pour la Recherche Scientifique et Technique | CNRST | |
| Staatssekretariat für Bildung, Forschung und Innovation | SBFI | |
| Horizon 2020 | ||
| British Columbia Knowledge Development Fund | BCKDF | |
| European Regional Development Fund | ERDF | |
| Defence Science Institute | DSI | |
| Narodowa Agencja Wymiany Akademickiej | NAWA | |
| Institutul de Fizică Atomică | IFA | |
| Agencia Nacional de Investigación y Desarrollo | ANID | |
| Royal Society of South Australia | RSSA | |
| Irish Rugby Football Union | IRFU |
We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; ANID, Chile; CAS, MOST and NSFC, China; Minciencias, Colombia; MEYS CR, Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS and CEA-DRF/IRFU, France; SRNSFG, Georgia; BMBF, HGF and MPG, Germany; GSRI, Greece; RGC and Hong Kong SAR, China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO, Netherlands; RCN, Norway; MEiN, Poland; FCT, Portugal; MNE/IFA, Romania; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZŠ, Slovenia; DSI/NRF, South Africa; MICINN, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TENMAK, Türkiye; STFC, United Kingdom; DOE and NSF, United States of America. In addition, individual groups and members have received support from BCKDF, CANARIE, Compute Canada and CRC, Canada; PRIMUS 21/SCI/017 and UNCE SCI/013, Czech Republic; COST, ERC, ERDF, Horizon 2020 and Marie Skłodowska-Curie Actions, European Union; Investissements d’Avenir Labex, Investissements d’Avenir Idex and ANR, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by EU-ESF and the Greek NSRF, Greece; BSF-NSF and MINERVA, Israel; Norwegian Financial Mechanism 2014-2021, Norway; NCN and NAWA, Poland; La Caixa Banking Foundation, CERCA Programme Generalitat de Catalunya and PROMETEO and GenT Programmes Generalitat Valenciana, Spain; Göran Gustafssons Stiftelse, Sweden; The Royal Society and Leverhulme Trust, United Kingdom. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN, the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (United Kingdom) and BNL (USA), the Tier-2 facilities worldwide and large non-WLCG resource providers. Major contributors of computing resources are listed in Ref. .
We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; ANID, Chile; CAS, MOST and NSFC, China; Minciencias, Colombia; MEYS CR, Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS and CEA-DRF/IRFU, France; SRNSFG, Georgia; BMBF, HGF and MPG, Germany; GSRI, Greece; RGC and Hong Kong SAR, China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO, Netherlands; RCN, Norway; MEiN, Poland; FCT, Portugal; MNE/IFA, Romania; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZŠ, Slovenia; DSI/NRF, South Africa; MICINN, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TENMAK, Türkiye; STFC, United Kingdom; DOE and NSF, United States of America. In addition, individual groups and members have received support from BCKDF, CANARIE, Compute Canada and CRC, Canada; PRIMUS 21/SCI/017 and UNCE SCI/013, Czech Republic; COST, ERC, ERDF, Horizon 2020 and Marie Skłodowska-Curie Actions, European Union; Investissements d’Avenir Labex, Investissements d’Avenir Idex and ANR, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by EU-ESF and the Greek NSRF, Greece; BSF-NSF and MINERVA, Israel; Norwegian Financial Mechanism 2014-2021, Norway; NCN and NAWA, Poland; La Caixa Banking Foundation, CERCA Programme Generalitat de Catalunya and PROMETEO and GenT Programmes Generalitat Valenciana, Spain; Göran Gustafssons Stiftelse, Sweden; The Royal Society and Leverhulme Trust, United Kingdom. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN, the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (United Kingdom) and BNL (USA), the Tier-2 facilities worldwide and large non-WLCG resource providers. Major contributors of computing resources are listed in Ref. [76].
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