Observation Of Top Quark Pairs Produced In Association With A Vector Boson In Pp Collisions At Root S=8 Tev

V. Khachatryan; A. M. Sirunyan; A. Tumasyan; Sara Alderweireldt; Tom Cornelis; Eddi Wolf; Xavier Janssen; Albert Knutsson; Jasper Lauwers; Sten Luyckx; Romain Rougny; Merijn Klundert; Hans Haevermaet; Pierre Mechelen; Nick Remortel; Alex Spilbeeck; John Chou

doi:10.1007/JHEP01(2016)096

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No. of bitstreams: 0 Previous issue date: 2016-01-18 Austrian Federal Ministry of Science, Research and Economy Austrian Science Fund Belgian Fonds de la Recherche Scientifique Fonds voor Wetenschappelijk Onderzoek Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Bulgarian Ministry of Education and Science CERN Chinese Academy of Sciences Ministry of Science and Technology National Natural Science Foundation of China Colombian Funding Agency (COLCIENCIAS) Croatian Ministry of Science, Education and Sport Croatian Science Foundation Research Promotion Foundation, Cyprus Ministry of Education and Research, Estonian Research Council European Regional Development Fund, Estonia Academy of Finland Finnish Ministry of Education and Culture Helsinki Institute of Physics Institut National de Physique Nucleaire et de Physique des Particules / CNRS Commissariat a l'Energie Atomique et aux Energies Alternatives / CEA, France Bundesministerium fur Bildung and Forschung, Germany Deutsche Forschungsgemeinschaft, Germany Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germany General Secretariat for Research and Technology, Greece National Scientific Research Foundation National Innovation Office, Hungary Department of Atomic Energy, India Department of Science and Technology, India Institute for Studies in Theoretical Physics and Mathematics, Iran Science Foundation, Ireland Istituto Nazionale di Fisica Nucleare, Italy Ministry of Science, ICT and Future Planning, Republic of Korea National Research Foundation (NRF), Republic of Korea Lithuanian Academy of Sciences Ministry of Education (Malaysia) University of Malaya (Malaysia); CINVESTAV CONACYT SEP UASLP-FAI Ministry of Business, Innovation and Employment, New Zealand Pakistan Atomic Energy Commission Ministry of Science and Higher Education, Poland National Science Centre, Poland Fundacao para a Ciencia e a Tecnologia, Portugal JINR, Dubna Ministry of Education and Science of the Russian Federation Federal Agency of Atomic Energy of the Russian Federation Russian Academy of Sciences Russian Foundation for Basic Research Ministry of Education, Science and Technological Development of Serbia Secretarla de Estado de Investigacion, Spain Desarrollo e Innovation and Programa Consolider-Ingenio, Spain ETH Board ETH Zurich PSI SNF UniZH Canton Zurich SER Ministry of Science and Technology, Taipei Thailand Center of Excellence in Physics Institute for the Promotion of Teaching Science and Technology of Thailand Special Task Force for Activating Research National Science and Technology Development Agency of Thailand Scientific and Technical Research Council of Turkey Turkish Atomic Energy Authority National Academy of Sciences of Ukraine State Fund for Fundamental Researches, Ukraine Science and Technology Facilities Council, U.K. US Department of Energy US National Science Foundation Marie-Curie program (European Union) European Research Council (European Union) EPLANET (European Union) Leventis Foundation A. P. Sloan Foundation Alexander von Humboldt Foundation Belgian Federal Science Policy Office Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium) Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium) Ministry of Education, Youth and Sports (MEYS) of the Czech Republic Council of Science and Industrial Research, India HOMING PLUS program of the Foundation for Polish Science (Poland) European Union (Poland) OPUS program of the National Science Center (Poland) Compagnia di San Paolo (Torino) Consorzio per la Fisica (Trieste) MIUR project (Italy) EU-ESF Greek NSRF National Priorities Research Program by Qatar National Research Fund Rachadapisek Sompot Fund for Postdoctoral Fellowship (Thailand) Chulalongkorn University (Thailand) Welch Foundation Science and Technology Facilities Council Measurements of the cross sections for top quark pairs produced in association with a W or Z boson are presented, using 8 TeV pp collision data corresponding to an integrated luminosity of 19.5 fb(-1), collected by the CMS experiment at the LHC. Final states are selected in which the associated W boson decays to a charged lepton and a neutrino or the Z boson decays to two charged leptons. Signal events are identified by matching reconstructed objects in the detector to specific final state particles from t (t) over barW or t (t) over barZ decays. The t (t) over barW cross section is measured to be 382(-102)(+117) fb with a significance of 4.8 standard deviations from the background-only hypothesis. The t (t) over barZ cross section is measured to be 242(-55)(+65) fb with a significance of 6.4 standard deviations from the background-only hypothesis. These measurements are used to set bounds on five anomalous dimension-six operators that would affect the t (t) over barW and t (t) over barZ cross sections. 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Observation Of Top Quark Pairs Produced In Association With A Vector Boson In Pp Collisions At Root S=8 Tev

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