Search for new phenomena with top quark pairs in final states with one lepton, jets, and missing transverse momentum in pp collisions at root s = 13 TeV with the ATLAS detector
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Hadron-Hadron scattering (experiments)Supersymmetry
The ATLAS collaboration., Aad, G., Abbott, B. et al. Search for new phenomena with top quark pairs in final states with one lepton, jets, and missing transverse momentum in pp collisions at s√ = 13 TeV with the ATLAS detector. J. High Energ. Phys. 2021, 174 (2021). [https://doi.org/10.1007/JHEP04(2021)174]
SponsorshipANPCyT; 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); Canada Foundation for Innovation; National Natural Science Foundation of China (NSFC); Departamento Administrativo de Ciencia, Tecnologia e Innovacion Colciencias; Ministry of Education, Youth & Sports - Czech Republic Czech Republic Government Czech Republic Government Czech Republic Government; DNRF, Denmark; Danish Natural Science Research Council; Centre National de la Recherche Scientifique (CNRS); CEA-DRF/IRFU, France; Federal Ministry of Education & Research (BMBF); Max Planck Society; Greek Ministry of Development-GSRT; RGC and 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); Japan Society for the Promotion of Science; CNRST, Morocco; RCN, Norway; Ministry of Science and Higher Education, Poland; NCN, Poland; Portuguese Foundation for Science and Technology; European Commission; MNE/IFA, Romania; NRC KI, Russia Federation; MESTD, Serbia; MSSR, Slovakia; Slovenian Research Agency - Slovenia; MIZS, Slovenia; Spanish Government; SRC, Sweden; Wallenberg Foundation, Sweden; SNSF 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; CRC, Canada; European Research Council (ERC) European Commission European Commission European Commission; French National Research Agency (ANR) French National Research Agency (ANR); German Research Foundation (DFG); Alexander von Humboldt Foundation; BSF-NSF, Israel; German-Israeli Foundation for Scientific Research and Development; La Caixa Banking Foundation, Spain; CERCA Programme Generalitat de Catalunya, Spain; PROMETEO and GenT Programmes Generalitat Valenciana, Spain; Goran Gustafssons Stiftelse, Sweden; Royal Society of London; Leverhulme Trust; NRC, Canada; CERN; ANID, Chile; Chinese Academy of Sciences; Ministry of Science and Technology, China; SRNSFG, Georgia; HGF, Germany; Netherlands Organization for Scientific Research (NWO) Netherlands Government; MES of Russia; JINR; DST/NRF, South Africa; SERI Geneva, Switzerland; Cantons of Bern and Geneva, Switzerland; Compute Canada, Canada; Horizon 2020; Marie Sklodowska-Curie Actions; European Cooperation in Science and Technology (COST); French National Research Agency (ANR); EU-ESF, Greece
A search for new phenomena with top quark pairs in final states with one isolated electron or muon, multiple jets, and large missing transverse momentum is performed. Signal regions are designed to search for two-, three-, and four-body decays of the directly pair-produced supersymmetric partner of the top quark (stop). Additional signal regions are designed specifically to search for spin-0 mediators that are produced in association with a pair of top quarks and decay into a pair of dark-matter particles. The search is performed using the Large Hadron Collider proton-proton collision dataset at a centre-of-mass energy of s = 13 TeV recorded by the ATLAS detector from 2015 to 2018, corresponding to an integrated luminosity of 139 fb(-1). No significant excess above the Standard Model background is observed, and limits at 95% confidence level are set in the stop-neutralino mass plane and as a function of the mediator mass or the dark-matter particle mass. Stops are excluded up to 1200 GeV (710 GeV) in the two-body (three-body) decay scenario. In the four-body scenario stops up to 640 GeV are excluded for a stop-neutralino mass difference of 60 GeV. Scalar and pseudoscalar dark-matter mediators are excluded up to 200 GeV when the coupling strengths of the mediator to Standard Model and dark-matter particles are both equal to one and when the mass of the dark-matter particle is 1 GeV.