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; CMS Collaboration; Abdulla Abdulsalam

doi:10.1007/JHEP01(2016)096

Made available in DSpace on 2018-11-27T09:11:57Z (GMT). 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. Yerevan Phys Inst, Yerevan 375036, Armenia Inst Hochenergiephys OeAW, Vienna, Austria Natl Ctr Particle & High Energy Phys, Minsk, Byelarus Univ Antwerp, Antwerp, Belgium Vrije Univ Brussel, Brussels, Belgium Univ Libre Bruxelles, Brussels, Belgium Univ Ghent, B-9000 Ghent, Belgium Catholic Univ Louvain, Louvain, Belgium Univ Mons, B-7000 Mons, Belgium Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil Univ Estado Rio de Janeiro, BR-20550011 Rio De Janeiro, Brazil Univ Estadual Paulista, Sao Paulo, Brazil Univ Fed ABC, Sao Paulo, Brazil Bulgarian Acad Sci, Inst Nucl Res & Nucl Energy, Sofia, Bulgaria Univ Sofia, BU-1126 Sofia, Bulgaria Inst High Energy Phys, Beijing 100039, Peoples R China Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China Univ Los Andes, Bogota, Colombia Univ Split, Fac Elect Engn Mech Engn & Naval Architecture, Split, Croatia Univ Split, Fac Sci, Split, Croatia Inst Rudjer Boskov, Zagreb, Croatia Univ Cyprus, CY-1678 Nicosia, Cyprus Charles Univ Prague, Prague, Czech Republic Acad Sci Res & Technol Arab Republ Egypt, Egyptian Network High Energy Phys, Cairo, Egypt NICPB, Tallinn, Estonia Univ Helsinki, Dept Phys, Helsinki, Finland Helsinki Inst Phys, Helsinki, Finland Lappeenranta Univ Technol, Lappeenranta, Finland CEA Saclay, DSM IRFU, F-91191 Gif Sur Yvette, France Ecole Polytech, CNRS, Lab Leprince Ringuet, IN2P3, F-91128 Palaiseau, France Univ Strasbourg, Inst Pluridisciplinaire Hubert Curien, Univ Haute Alsace Mulhouse, CNRS,IN2P3, Strasbourg, France CNRS, Inst Natl Phys Nucl & Phys Particules, IN2P3, Villeurbanne, France Univ Lyon 1, Inst Phys Nucl Lyon, CNRS, IN2P3, F-69622 Villeurbanne, France Georgian Tech Univ, Tbilisi, Georgia Tbilisi State Univ, GE-380086 Tbilisi, Georgia Rhein Westfal TH Aachen, Phys Inst 1, Aachen, Germany Rhein Westfal TH Aachen, Phys Inst A 3, Aachen, Germany Rhein Westfal TH Aachen, Phys Inst B 3, Aachen, Germany Deutsch Elekt Synchrotron, Hamburg, Germany Univ Hamburg, Hamburg, Germany Univ Karlsruhe, Inst Expt Kernphys, Karlsruhe, Germany NCSR Demokritos, INPP, Aghia Paraskevi, Greece Univ Athens, Athens, Greece Univ Ioannina, GR-45110 Ioannina, Greece Wigner Res Ctr Phys, Budapest, Hungary Inst Nucl Res ATOMKI, Debrecen, Hungary Univ Debrecen, Debrecen, Hungary Natl Inst Sci Educ & Res, Bhubaneswar, Orissa, India Panjab Univ, Chandigarh 160014, India Univ Delhi, Delhi 110007, India Saha Inst Nucl Phys, Kolkata, India Bhabha Atom Res Ctr, Mumbai 400085, Maharashtra, India Tata Inst Fundamental Res, Homi Bhabha Rd, Bombay 400005, Maharashtra, India IISER, Pune, Maharashtra, India Inst Res Fundamental Sci IPM, Tehran, Iran Univ Coll Dublin, Dublin 2, Ireland Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy Univ Bari, Bari, Italy Politecn Bari, Bari, Italy Ist Nazl Fis Nucl, Sez Bologna, I-40126 Bologna, Italy Univ Bologna, Bologna, Italy Ist Nazl Fis Nucl, Sez Catania, I-95129 Catania, Italy Univ Catania, Catania, Italy Ist Nazl Fis Nucl, Sez Firenze, I-50125 Florence, Italy Univ Florence, Florence, Italy Ist Nazl Fis Nucl, Lab Nazl Frascati, POB 13, I-00044 Frascati, Italy Ist Nazl Fis Nucl, Sez Genova, Via Dodecaneso 33, I-16146 Genoa, Italy Univ Genoa, Genoa, Italy Ist Nazl Fis Nucl, Sez Milano Bicocca, Via Celoria 16, I-20133 Milan, Italy Univ Milano Bicocca, Milan, Italy Ist Nazl Fis Nucl, Sez Napoli, I-80125 Naples, Italy Univ Naples Federico II, Naples, Italy Univ Basilicata, I-85100 Potenza, Italy Univ G Marconi, Rome, Italy Ist Nazl Fis Nucl, Sez Padova, Padua, Italy Univ Padua, Padua, Italy Univ Trento, Trento, Italy Ist Nazl Fis Nucl, Sez Pavia, I-27100 Pavia, Italy Univ Pavia, Via Palestro 3, I-27100 Pavia, Italy Ist Nazl Fis Nucl, Sez Perugia, I-06100 Perugia, Italy Univ Perugia, I-06100 Perugia, Italy Ist Nazl Fis Nucl, Sez Pisa, Pisa, Italy Univ Pisa, Pisa, Italy Scuola Normale Super Pisa, Pisa, Italy Ist Nazl Fis Nucl, Sez Roma, Rome, Italy Univ Rome, Rome, Italy Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy Univ Turin, Turin, Italy Univ Piemonte Orientale, Novara, Italy Ist Nazl Fis Nucl, Sez Trieste, Trieste, Italy Univ Trieste, Trieste, Italy Kangwon Natl Univ, Chunchon, South Korea Kyungpook Natl Univ, Daegu, South Korea Chonbuk Natl Univ, Jeonju 561756, South Korea Chonnam Natl Univ, Inst Univ & Elementary Particles, Kwangju, South Korea Korea Univ, Seoul, South Korea Seoul Natl Univ, Seoul, South Korea Univ Seoul, Seoul, South Korea Sungkyunkwan Univ, Suwon, South Korea Vilnius Univ, Vilnius, Lithuania Univ Malaya, Natl Ctr Particle Phys, Kuala Lumpur, Malaysia IPN, Ctr Invest & Estudios Avanzados, Mexico City 07738, DF, Mexico Univ Iberoamer, Mexico City, DF, Mexico Univ Autonoma San Luis Potosi, San Luis Potosi, Mexico Univ Auckland, Auckland 1, New Zealand Univ Canterbury, Christchurch 1, New Zealand Quaid I Azam Univ, Natl Ctr Phys, Islamabad, Pakistan

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

Abstract

Files and links (1)

Metrics

Details