Observation of photon-induced W+W−production in pp collisions at √s=13TeV using the ATLAS detector
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G. Aad... [et al.]. Observation of photon-induced W+W− production in pp collisions at s=13 TeV using the ATLAS detector, Physics Letters B, Volume 816, 2021, 136190, ISSN 0370-2693, [https://doi.org/10.1016/j.physletb.2021.136190]
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); 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); 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; SRNSFG, Georgia; Federal Ministry of Education & Research (BMBF); HGF, Germany; Max Planck Society; Greek Ministry of Development-GSRT; 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; MES of Russia, Russia Federation; NRC KI, Russia Federation; JINR; MESTD, Serbia; MSSR, Slovakia; Slovenian Research Agency - Slovenia; MIZS, Slovenia; DST/NRF, South Africa; Spanish Government; SRC, Sweden; Wallenberg Foundation, Sweden; SERI, Switzerland; Swiss National Science Foundation (SNSF); Canton of Bern, 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); ERDF, European Union; Horizon 2020, European Union; Marie Sklodowska-Curie Actions, European Union; COST, European Union; French National Research Agency (ANR); French National Research Agency (ANR); German Research Foundation (DFG); Alexander von Humboldt Foundation; Herakleitos programme; Aristeia programme; European Commission; Greek NSRF, Greece; BSF-NSF, Israel; German-Israeli Foundation for Scientific Research and Development; La Caixa Banking Foundation, Spain; CERCA Programme Generalitat de Catalunya, Spain; GenT Programme Generalitat Valenciana, Spain; Goran Gustafssons Stiftelse, Sweden; Royal Society of London; Leverhulme Trust; Canton of Geneva, Switzerland; Compute Canada, Canada; Thales programme; PROMETEO Programme Generalitat Valenciana, Spain
This letter reports the observation of photon-induced production of W-boson pairs, gamma gamma -> WW. The analysis uses 139 fb(-1) of LHC proton-proton collision data taken at root s = 13 TeV recorded by the ATLAS experiment during the years 2015-2018. The measurement is performed selecting one electron and one muon, corresponding to the decay of the diboson system as WW -> e(+/-)nu mu(-/+)nu final state. The background-only hypothesis is rejected with a significance of well above 5 standard deviations consistent with the expectation from Monte Carlo simulation. A cross section for the gamma gamma -> WW process of 3.13 +/- 0.31(stat.) +/- 0.28(syst.) fb is measured in a fiducial volume close to the acceptance of the detector, by requiring an electron and a muon of opposite signs with large dilepton transverse momentum and exactly zero additional charged particles. This is found to be in agreement with the Standard Model prediction.