Measurement of the t(t)over-bart(t)over-bar production cross section in pp collisions at root s=13 TeV with the ATLAS detector
Metadatos
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Springer
Materia
Hadron-Hadron scattering (experiments) Top physics
Fecha
2021-11-16Referencia bibliográfica
The ATLAS collaboration... [et al.]. Measurement of the tt¯tt¯ production cross section in pp collisions at s√ = 13 TeV with the ATLAS detector. J. High Energ. Phys. 2021, 118 (2021). [https://doi.org/10.1007/JHEP11(2021)118]
Patrocinador
ANPCyT; YerPhI, Armenia; Australian Research Council; BMWFW, Austria; Austrian Science Fund (FWF); Azerbaijan National Academy of Sciences (ANAS); SSTC, Belarus; Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ); Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP); Natural Sciences and Engineering Research Council of Canada (NSERC) NRC, Canada Canada Foundation for Innovation; CERN; ANID, Chile; Chinese Academy of Sciences Ministry of Science and Technology, China National Natural Science Foundation of China (NSFC); Minciencias, Colombia; Ministry of Education, Youth & Sports - Czech Republic Czech Republic Government; DNRF, Denmark Danish Natural Science Research Council; Centre National de la Recherche Scientifique (CNRS) CEA-DRF/IRFU, France; SRNSFG, Georgia; Federal Ministry of Education & Research (BMBF); HGF, Germany; Max Planck Society; GSRI, Greece; RGC, China Hong Kong SAR, China; Israel Science Foundation Benoziyo Center, Israel; Istituto Nazionale di Fisica Nucleare (INFN); Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Japan Society for the Promotion of Science; CNRST, Morocco; Netherlands Organization for Scientific Research (NWO) Netherlands Government; RCN, Norway; Ministry of Science and Higher Education, Poland NCN, Poland; Portuguese Foundation for Science and Technology European Commission; MNE/IFA, Romania; JINR; Russian Federation NRC KI, Russian Federation; Ministry of Education, Science & Technological Development, Serbia; MSSR, Slovakia; Slovenian Research Agency - Slovenia MIZS, Slovenia; DSI/NRF, South Africa; Spanish Government; SRC, Sweden; SERI, Switzerland; Swiss National Science Foundation (SNSF) Canton Geneva, Switzerland; Ministry of Science and Technology, Taiwan; Ministry of Energy & Natural Resources - Turkey; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC); United States Department of Energy (DOE); National Science Foundation (NSF); BCKDF, Canada CANARIE, Canada Compute Canada, Canada CRC, Canada; COST, European Union European Research Council (ERC) ERDF, European Union Horizon 2020, European Union Marie Sklodowska-Curie Actions, European Union; French National Research Agency (ANR); German Research Foundation (DFG) Alexander von Humboldt Foundation; Herakleitos programme - EU-ESF, Greece Thales Group Aristeia programme - EU-ESF, Greece Greek NSRF, Greece; BSF-NSF, Israel German-Israeli Foundation for Scientific Research and Development; Norwegian Financial Mechanism 2014-2021, Norway; La Caixa Banking Foundation, Spain CERCA Programme Generalitat de Catalunya, Spain PROMETEO Programme Generalitat Valenciana, Spain GenT Programme Generalitat Valenciana, Spain; Goran Gustafssons Stiftelse, Sweden; Royal Society of London; Leverhulme Trust; Wallenberg Foundation, Sweden; Canton of Geneva, SwitzerlandResumen
A measurement of four-top-quark production using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS detector at the Large Hadron Collider corresponding to an integrated luminosity of 139 fb(-1) is presented. Events are selected if they contain a single lepton (electron or muon) or an opposite-sign lepton pair, in association with multiple jets. The events are categorised according to the number of jets and how likely these are to contain b-hadrons. A multivariate technique is then used to discriminate between signal and background events. The measured four-top-quark production cross section is found to be 26(-15)(+17) fb, with a corresponding observed (expected) significance of 1.9 (1.0) standard deviations over the background-only hypothesis. The result is combined with the previous measurement performed by the ATLAS Collaboration in the multilepton final state. The combined four-top-quark production cross section is measured to be 24(-6)(+7) fb, with a corresponding observed (expected) signal significance of 4.7 (2.6) standard deviations over the background-only predictions. It is consistent within 2.0 standard deviations with the Standard Model expectation of 12.0 +/- 2.4 fb.