Published March 2017
| Submitted + Published
Journal Article
Open
Search for CP violation in tt production and decay in proton-proton collisions at √s = 8 TeV
Abstract
The results of a first search for CP violation in the production and decay of top quark-antiquark (tt) pairs are presented. The search is based on asymmetries in T-odd, triple-product correlation observables, where T is the time-reversal operator. The analysis uses a sample of proton-proton collisions at √s=8 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 19.7 fb^(−1). Events are selected having one electron or muon and at least four jets. The T-odd observables are measured using four-momentum vectors associated with tt production and decay. The measured asymmetries exhibit no evidence for CP-violating effects, consistent with the expectation from the standard model.
Additional Information
© 2017 The Author(s). This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. Article funded by SCOAP3. Received: November 27, 2016; Revised: February 12, 2017; Accepted: February 22, 2017; Published: March 20, 2017. 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: BMWFW and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES and CSF (Croatia); RPF (Cyprus); SENESCYT (Ecuador); MoER, ERC IUT, and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NIH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); MSIP and NRF (Republic of Korea); LAS (Lithuania); MOE and UM (Malaysia); BUAP, CINVESTAV, CONACYT, LNS, SEP, and UASLP-FAI (Mexico); MBIE (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna); MON, RosAtom, RAS, and RFBR (Russia); MESTD (Serbia); SEIDI and CPAN (Spain); Swiss Funding Agencies (Switzerland); MST (Taipei); ThEPCenter, IPST, STAR, and NSTDA (Thailand); TUBITAK and TAEK (Turkey); NASU and SFFR (Ukraine); STFC (United Kingdom); DOE and NSF (U.S.A.). 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 Mobility Plus program of the Ministry of Science and Higher Education, the National Science Center (Poland), contracts Harmonia 2014/14/M/ST2/00428, Opus 2014/13/B/ST2/02543, 2014/15/B/ST2/03998, and 2015/19/B/ST2/02861, Sonatabis 2012/07/E/ST2/01406; the Thalis and Aristeia programs cofinanced by EU-ESF and the Greek NSRF; the National Priorities Research Program by Qatar National Research Fund; the Programa Clarín-COFUND del Principado de Asturias; the Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University and the Chulalongkorn Academic into Its 2nd Century Project Advancement Project (Thailand); and the Welch Foundation, contract C-1845.Attached Files
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Submitted - 1611.08931.pdf
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Additional details
- Eprint ID
- 81933
- Resolver ID
- CaltechAUTHORS:20171002-084214285
- Bundesministerium für Wissenschaft, Forschung und Wirtschaft (BMWFW)
- FWF Der Wissenschaftsfonds
- Fonds de la Recherche Scientifique (FNRS)
- Fonds Wetenschappelijk Onderzoek (FWO)
- 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 Sao Paulo (FAPESP)
- Bulgarian Ministry of Education and Science
- European Organization for Nuclear Research (CERN)
- Chinese Academy of Sciences (CAS)
- Ministry of Science and Technology (China)
- National Natural Science Foundation of China
- Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS)
- Ministry of Science, Education and Sport (Croatia)
- Croatian Science Foundation
- Research Promotion Foundation, Cyprus
- Secretaría de Educación Superior, Ciencia, Tecnología e Innovación (SENESCYT)
- Ministry of Education and Research (Estonia)
- Estonian Research Council
- European Regional Development Fund, Estonia
- Academy of Finland
- Ministry of Education and Culture (Finland)
- Helsinki Institute of Physics
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives (CEA)
- Centre National de la Recherche Scientifique (CNRS)
- Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)
- Bundesministerium für Bildung und Forschung (BMBF)
- Deutsche Forschungsgemeinschaft (DFG)
- Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF)
- General Secretariat for Research and Technology (GSRT)
- Hungarian Scientific Research Fund (OTKA)
- 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 (INFN)
- Ministry of Science, ICT and Future Planning (Korea)
- National Research Foundation of Korea
- Lithuanian Academy of Sciences
- Ministry of Education (Malaysia)
- University of Malaya
- Benemérita Universidad Autónoma de Puebla (BUAP)
- Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV)
- Consejo Nacional de Ciencia y Tecnología (CONACYT)
- Laboratorio Nacional de Supercómputo (LNS)
- Secretaría de Educación Pública (SEP)
- Universidad Autónoma de San Luis Potosí Inicio-Facultad de Ingeniería (UASLP-FAI)
- Ministry of Business, Innovation and Employment (New Zealand)
- Atomic Energy Commission (Pakistan)
- Ministry of Science and Higher Education (Poland)
- National Science Centre (Poland)
- Fundação para a Ciência e a Tecnologia (FCT)
- JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan)
- Ministry of Education and Science of the Russian Federation
- RosAtom
- Russian Academy of Sciences
- Russian Foundation for Basic Research
- Ministry of Education, Science and Technological Development of Serbia
- Secretaría de Estado de Investigación, Desarrollo e Innovación
- Centro Nacional de Física de Partículas, Astropartículas y Nuclear (CPAN)
- Swiss Funding Agencies
- Ministry of Science and Technology (Taipei)
- Thailand Center of Excellence in Physics
- Institute for the Promotion of Teaching Science and Technology (Thailand)
- Special Task Force for Activating Research (Thailand)
- National Science and Technology Development Agency (Thailand)
- Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK)
- Türkiye Atom Enerjisi Kurumu (TAEK)
- National Academy of Sciences (Ukraine)
- State Fund for Fundamental Researches (Ukraine)
- Science and Technology Facilities Council (STFC)
- Department of Energy (DOE)
- NSF
- Marie Curie Fellowship
- European Research Council (ERC)
- EPLANET
- 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)
- Foundation for Polish Science HOMING PLUS program
- European Union Regional Development Fund
- Mobility Plus program
- 2014/14/M/ST2/00428
- Harmonia program
- 2014/13/B/ST2/02543
- OPUS program
- 2014/15/B/ST2/03998
- OPUS program
- 2015/19/B/ST2/02861
- OPUS program
- 2012/07/E/ST2/01406
- Sonata-bis program
- Thalis program
- Aristeia program
- European Social Fund
- Greek National Strategic Reference Framework (NSRF)
- Qatar National Research Fund National Priorities Research Program
- Programa Clarín-COFUND del Principado de Asturias
- Rachadapisek Sompot Fund for Postdoctoral Fellowship Chulalongkorn University (Thailand)
- Chulalongkorn Academic into Its 2nd Century Project Advancement Project (Thailand)
- C-1845
- Robert A. Welch Foundation
- SCOAP3
- Created
-
2017-10-02Created from EPrint's datestamp field
- Updated
-
2021-11-15Created from EPrint's last_modified field
- Caltech groups
- CMS@Caltech