Measurement of single top-quark production in association with a W boson in the single-lepton channel at √ s = 8 TeV with the ATLAS detector
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Aad, G... [et al.]. Measurement of single top-quark production in association with a W boson in the single-lepton channel at s√=8TeV with the ATLAS detector. Eur. Phys. J. C 81, 720 (2021). [https://doi.org/10.1140/epjc/s10052-021-09371-7]
SponsorshipCERN; ANPCyT; YerPhI, Armenia; Australian Research Council; BMWFW; 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; MPO CR; Czech Republic Government; DNRF; 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) Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Japan Society for the Promotion of Science; CNRST, Morocco; NWO, Netherlands; RCN, Norway; Ministry of Science and Higher Education, Poland NCN, Poland; Portuguese Foundation for Science and Technology European Commission; MNE/IFA, Romania; Russian Federation; Ministry of Education, Science & Technological Development, Serbia; MSSR, Slovakia; Slovenian Research Agency - Slovenia MIZS, Slovenia; Spanish Government; SRC; Wallenberg Foundation, Sweden; SNSF and Cantons of Bern and Geneva, Switzerland; Ministry of Science and Technology, Taiwan; Ministry of Energy & Natural Resources - Turkey; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC); CANARIE ComputeCanada; Beijing Municipal Science & Technology Commission; COST, ERC European Commission Marie Sklodowska-Curie Actions, European Union; French National Research Agency (ANR); German Research Foundation (DFG); European Commission; Alexander von Humboldt Foundation; Greek NSRF, Greece; BSF-NSF; German-Israeli Foundation for Scientific Research and Development; La Caixa Foundation CERCA Programme Generalitat de Catalunya; PROMETEO Generalitat Valenciana; Goran Gustafssons Stiftelse, Sweden; Royal Society of London; European Commission; Leverhulme Trust; NDGF (Denmark, Norway, Sweden); KIT/GridKA (Germany); INFN-CNAF (Italy); NL-T1 (Netherlands), PIC (Spain); ASGC (Taiwan); BNL (USA)
The production cross-section of a top quark in association with a W boson is measured using proton–proton collisions at √ s = 8 TeV. The dataset corresponds to an integrated luminosity of 20.2 fb−1, and was collected in 2012 by the ATLAS detector at the Large Hadron Collider at CERN. The analysis is performed in the single-lepton channel. Events are selected by requiring one isolated lepton (electron or muon) and at least three jets. A neural network is trained to separate the tW signal from the dominant t ¯t background. The cross-section is extracted from a binned profile maximum-likelihood fit to a two-dimensional discriminant built from the neural-network output and the invariant mass of the hadronically decaying W boson. The measured crosssection is σtW = 26 ± 7 pb, in good agreement with the Standard Model expectation.