Published January 2016
| Version Published + Submitted
Journal Article
Open
Observation of top quark pairs produced in association with a vector boson in pp collisions √s = 8 TeV
Abstract
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 ttW or ttZ decays. The ttW cross section is measured to be 382_(− 102)^(+ 117) fb with a significance of 4.8 standard deviations from the background-only hypothesis. The ttZ 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 ttW and ttZ cross sections.
Additional Information
Open Access. © 2016 CERN, for the benefit of the CMS Collaboration. Article funded by SCOAP3. We congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes for their contributions to the success of the CMS effort. In addition, we gratefully acknowledge the computing centers and personnel of the Worldwide LHC Computing Grid for delivering so effectively the computing infrastructure essential to our analyses. Finally, we acknowledge the enduring support for the construction and operation of the LHC and the CMS detector provided by the following funding agencies: the Austrian Federal Ministry of Science, Research and Economy and the Austrian Science Fund; the Belgian Fonds de la Recherche Scientifique, and Fonds voor Wetenschappelijk Onderzoek; the Brazilian Funding Agencies (CNPq, CAPES, FAPERJ, and FAPESP); the Bulgarian Ministry of Education and Science; CERN; the Chinese Academy of Sciences, Ministry of Science and Technology, and National Natural Science Foundation of China; the Colombian Funding Agency (COLCIENCIAS); the Croatian Ministry of Science, Education and Sport, and the Croatian Science Foundation; the Research Promotion Foundation, Cyprus; the Ministry of Education and Research, Estonian Research Council via IUT23-4 and IUT23-6 and European Regional Development Fund, Estonia; the Academy of Finland, Finnish Ministry of Education and Culture, and Helsinki Institute of Physics; the Institut National de Physique Nucléaire et de Physique des Particules / CNRS, and Commissariat à l'Énergie Atomique et aux Énergies Alternatives/CEA, France; the Bundesministerium für Bildung und Forschung, Deutsche Forschungsgemeinschaft, and Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germany; the General Secretariat for Research and Technology, Greece; the National Scientific Research Foundation, and National Innovation Office, Hungary; the Department of Atomic Energy and the Department of Science and Technology, India; the Institute for Studies in Theoretical Physics and Mathematics, Iran; the Science Foundation, Ireland; the Istituto Nazionale di Fisica Nucleare, Italy; the Ministry of Science, ICT and Future Planning, and National Research Foundation (NRF), Republic of Korea; the Lithuanian Academy of Sciences; the Ministry of Education, and University of Malaya (Malaysia); the Mexican Funding Agencies (CINVESTAV, CONACYT, SEP, and UASLP-FAI); the Ministry of Business, Innovation and Employment, New Zealand; the Pakistan Atomic Energy Commission; the Ministry of Science and Higher Education and the National Science Centre, Poland; the Fundação para a Ciência e a Tecnologia, Portugal; JINR, Dubna; the Ministry of Education and Science of the Russian Federation, the Federal Agency of Atomic Energy of the Russian Federation, Russian Academy of Sciences, and the Russian Foundation for Basic Research; the Ministry of Education, Science and Technological Development of Serbia; the Secretaría de Estado de Investigaciόn, Desarrollo e Innovaciόn and Programa Consolider-Ingenio 2010, Spain; the Swiss Funding Agencies (ETH Board, ETH Zurich, PSI, SNF, UniZH, Canton Zurich, and SER); the Ministry of Science and Technology, Taipei; the Thailand Center of Excellence in Physics, the Institute for the Promotion of Teaching Science and Technology of Thailand, Special Task Force for Activating Research and the National Science and Technology Development Agency of Thailand; the Scientific and Technical Research Council of Turkey, and Turkish Atomic Energy Authority; the National Academy of Sciences of Ukraine, and State Fund for Fundamental Researches, Ukraine; the Science and Technology Facilities Council, U.K.; the US Department of Energy, and the US National Science Foundation. Individuals have received support from the Marie-Curie program and the European Research Council and EPLANET (European Union); the Leventis Foundation; the A. P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office; the Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; the Council of Science and Industrial Research, India; the HOMING PLUS program of the Foundation for Polish Science, cofinanced from European Union, Regional Development Fund; the OPUS program of the National Science Center (Poland); the Compagnia di San Paolo (Torino); the Consorzio per la Fisica (Trieste); MIUR project 20108T4XTM (Italy); the Thalis and Aristeia programs cofinanced by EU-ESF and the Greek NSRF; the National Priorities Research Program by Qatar National Research Fund; the Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University (Thailand); and the Welch Foundation, contract C-1845.Attached Files
Published - art_10.1007_JHEP01_2016_096.pdf
Submitted - 1510.01131v2.pdf
Files
1510.01131v2.pdf
Files
(4.9 MB)
| Name | Size | Download all |
|---|---|---|
|
md5:e88476044fe7c2dc98975d228d8b9d4b
|
1.7 MB | Preview Download |
|
md5:1028ee0df718bf00724e216c9cdc9210
|
3.2 MB | Preview Download |
Additional details
Identifiers
- Eprint ID
- 65344
- Resolver ID
- CaltechAUTHORS:20160315-070019368
Related works
- Describes
- http://arxiv.org/abs/1510.01131 (URL)
Funding
- SCOAP3
- Bundesministerium für Wissenschaft, Forschung und Wirtschaft (BMWFW)
- Fonds de la Recherche Scientifique (FNRS)
- Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
- Bulgarian Ministry of Education and Science
- CERN
- Chinese Academy of Sciences
- COLCIENCIAS (Colombia)
- Croatian Ministry of Science, Education and Sport
- Research Promotion Foundation, Cyprus
- Ministry of Education and Research (Estonia)
- Academy of Finland
- Ministry of Education and Culture (Finland)
- Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)
- Commissariat à l'Energie Atomique (CEA)
- Bundesministerium für Bildung und Forschung (BMBF)
- General Secretariat for Research and Technology (GSRT)
- National Scientific Research Foundation (Hungary)
- Department of Atomic Energy (India)
- Institute for Studies in Theoretical Physics and Mathematics, Iran
- Science Foundation, Ireland
- Istituto Nazionale di Fisica Nucleare (INFN)
- Ministry of Science, ICT and Future Planning (Korea)
- Lithuanian Academy of Sciences
- Ministry of Education, and University of Malaya (Malaysia)
- CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico)
- Ministry of Business, Innovation and Employment, New Zealand
- Pakistan Atomic Energy Commission
- Ministry of Science and Higher Education and the National Science Centre, Poland
- Fundação para a Ciência e a Tecnologia (FCT)
- Joint Institute for Nuclear Research (JINR)
- Ministry of Education and Science of the Russian Federation
- Ministry of Education, Science and Technological Development of Serbia
- Secretaría de Estado de Investigaciόn, Desarrollo e Innovaciόn and Programa Consolider-Ingenio 2010, Spain
- ETH Board, ETH Zurich, PSI, SNF, UniZH, Canton Zurich, and 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 and the National Science and Technology Development Agency of Thailand
- Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK)
- National Academy of Sciences of Ukraine and State Fund for Fundamental Researches, Ukraine
- Science and Technology Facilities Council (STFC)
- Department of Energy (DOE)
- NSF
- Marie-Curie program
- Leventis Foundation
- Alfred P. Sloan Foundation
- Alexander von Humboldt Foundation
- Belgian Federal Science Policy Office (BELSPO)
- Fonds pour la Formation à 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, cofinanced by the European Regional Development Fund
- OPUS program of the National Science Center (Poland)
- Compagnia di San Paolo (Torino)
- Consorzio per la Fisica (Trieste)
- Ministero dell'Istruzione, dell'Università e della Ricerca (MIUR)
- 20108T4XTM
- Thalis programme
- Qatar National Research Fund National Priorities Research Program
- Rachadapisek Sompot Fund for Postdoctoral Fellowship Chulalongkorn University (Thailand)
- Welch Foundation
- C-1845
- Fonds Wetenschappelijk Onderzoek - Vlaanderen (FWO)
- FWF Der Wissenschaftsfonds
- 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)
- Ministry of Science and Technology (China)
- National Natural Science Foundation of China
- Croatian Science Foundation
- European Regional Development Fund, Estonia
- Estonian Research Council
- Helsinki Institute of Physics
- Centre National de la Recherche Scientifique (CNRS)
- Deutsche Forschungsgemeinschaft (DFG)
- Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF)
- National Innovation Office (Hungary)
- Department of Science and Technology of India
- National Research Foundation of Korea
- Consejo Nacional de Ciencia y Tecnologia (CONACyT)
- Russian Foundation for Basic Research
- Federal Agency of Atomic Energy of the Russian Federation
- Russian Academy of Sciences
- Türkiye Atom Enerjisi Kurumu (TAEK)
- European Social Fund
- Greek National Strategic Reference Framework (NSRF)
- Aristeia programme
- European Research Council (ERC)
- EPLANET
Dates
- Created
-
2016-03-15Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field