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Search for associated production of a Z boson with a single top quark and for tZ avour-changing interactions in pp collisions at at √s = 8 TeV

Anderson, D. and Bendavid, J. and Bornheim, A. and Bunn, J. and Duarte, J. and Lawhorn, J. M. and Mott, A. and Newman, H. B. and Pena, C. and Spiropulu, M. and Vlimant, J. R. and Xie, S. and Zhu, R. Y. and Dubinin, M. (2017) Search for associated production of a Z boson with a single top quark and for tZ avour-changing interactions in pp collisions at at √s = 8 TeV. Journal of High Energy Physics, 2017 (7). Art. No. 3. ISSN 1126-6708. http://resolver.caltech.edu/CaltechAUTHORS:20171004-113042217

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Abstract

A search for the production of a single top quark in association with a Z boson is presented, both to identify the expected standard model process and to search for flavour-changing neutral current interactions. The data sample corresponds to an integrated luminosity of 19.7 fb^(−1) recorded by the CMS experiment at the LHC in proton-proton collisions at √s = 8 TeV. Final states with three leptons (electrons or muons) and at least one jet are investigated. An events yield compatible with tZq standard model production is observed, and the corresponding cross section is measured to be σ(pp → tZq → ℓνbℓ^+ℓ^−q) = 10_(−7)^(+8) fb with a significance of 2.4 standard deviations. No presence of flavour-changing neutral current production of tZq is observed. Exclusion limits at 95% confidence level on the branching fractions of a top quark decaying to a Z boson and an up or a charm quark are found to be ℬ(t → Zu) < 0.022% and ℬ(t → Zc) < 0.049%.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1007/JHEP07(2017)003DOIArticle
https://link.springer.com/article/10.1007%2FJHEP07%282017%29003#copyrightInformationPublisherArticle
https://arxiv.org/abs/1702.01404arXivDiscussion Paper
ORCID:
AuthorORCID
Newman, H. B.0000-0003-0964-1480
Spiropulu, M.0000-0001-8172-7081
Xie, S.0000-0003-2509-5731
Zhu, R. Y.0000-0003-3091-7461
Additional Information:© 2017 The Author(s). CERN, for the benefit of the CMS Collaboration. 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: February 5, 2017. Revised: June 5, 2017. Accepted: June 19, 2017. Published: July 3, 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 centres 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 Secretariat for Higher Education, Science, Technology and Innovation, Ecuador; 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 (BUAP, CINVESTAV, CONACYT, LNS, 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, the Russian Foundation for Basic Research and the Russian Competitiveness Program of NRNU ?MEPhI?; the Ministry of Education, Science and Technological Development of Serbia; the Secretaría de Estado de Investigaciόn, Desarrollo e Innovaciόn, Programa Consolider-Ingenio 2010, Plan de Ciencia, Tecnología e Innovación 2013-2017 del Principado de Asturias and Fondo Europeo de Desarrollo Regional, 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 U.S. Department of Energy, and the U.S. National Science Foundation. Individuals have received support from the Marie-Curie programme 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 programme of the Foundation for Polish Science, cofinanced from European Union, Regional Development Fund, the Mobility Plus programme of the Ministry of Science and Higher Education, the National Science Center (Poland), contracts Harmonia 014/14/M/ST2/00428, Opus 2014/13/B/ST2/02543, 014/15/B/ST2/03998, and 2015/19/B/ST2/02861, Sonata-bis 2012/07/E/ST2/01406; the National Priorities Research Program by Qatar National Research Fund; the Programa Clarín-COFUND del Principado de Asturias; the Thalis and Aristeia programmes cofinanced by EU-ESF and the Greek NSRF; 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.
Group:CMS@Caltech
Funders:
Funding AgencyGrant Number
SCOAP3UNSPECIFIED
Bundesministerium für Verkehr, Innovation und Technologie (BMVIT)UNSPECIFIED
FWF Der WissenschaftsfondsUNSPECIFIED
Fonds de la Recherche Scientifique (FNRS)UNSPECIFIED
Fonds Wetenschappelijk Onderzoek - Vlaanderen (FWO)UNSPECIFIED
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)UNSPECIFIED
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)UNSPECIFIED
Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)UNSPECIFIED
Fundação de Amparo à Pesquisa do Estado de Sao Paulo (FAPESP)UNSPECIFIED
Ministry of Education and Science (Bulgaria)UNSPECIFIED
CERN UNSPECIFIED
Chinese Academy of SciencesUNSPECIFIED
Ministry of Science and Technology (China) UNSPECIFIED
National Natural Science Foundation of China UNSPECIFIED
Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS)UNSPECIFIED
Ministry of Science, Education and Sport (Croatia)UNSPECIFIED
Croatian Science FoundationUNSPECIFIED
Research Promotion Foundation (Cyprus) UNSPECIFIED
Secretaría de Educación Superior, Ciencia, Tecnología e Innovación (SENESCYT)UNSPECIFIED
Ministry of Education and Research (Estonia)UNSPECIFIED
Estonian Research CouncilIUT23-4
Estonian Research CouncilIUT23-6
European Regional Development Fund, EstoniaUNSPECIFIED
Academy of FinlandUNSPECIFIED
Ministerio de Educación y Ciencia (MEC)UNSPECIFIED
Helsinki Institute of PhysicsUNSPECIFIED
Commissariat à l'énergie atomique (CEA)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)UNSPECIFIED
Bundesministerium für Bildung und Forschung (BMBF)UNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF)UNSPECIFIED
General Secretariat for Research and Technology (GSRT)UNSPECIFIED
Hungarian Scientific Research Fund (OTKA)UNSPECIFIED
National Innovation Office (Hungary)UNSPECIFIED
Department of Atomic Energy (India)UNSPECIFIED
Department of Science and Technology (India)UNSPECIFIED
Institute for Research in Fundamental Sciences (Iran)UNSPECIFIED
Science Foundation, IrelandUNSPECIFIED
Istituto Nazionale di Fisica Nucleare (INFN)UNSPECIFIED
Ministry of Science, ICT and Future Planning (Korea)UNSPECIFIED
National Research Foundation of KoreaUNSPECIFIED
Lithuanian Academy of Sciences UNSPECIFIED
Ministry of Education (Malaysia)UNSPECIFIED
University of MalayaUNSPECIFIED
Benemérita Universidad Autónoma de Puebla (BUAP)UNSPECIFIED
Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINESTAV)UNSPECIFIED
Consejo Nacional de Ciencia y Tecnología (CONACYT)UNSPECIFIED
Laboratorio Nacional de Supercómputo (LNS)UNSPECIFIED
Secretaría de Educación Pública (SEP)UNSPECIFIED
Universidad Autónoma de San Luis Potosí Inicio-Facultad de Ingeniería (UASLP-FAI)UNSPECIFIED
Ministry of Business, Innovation and Employment (New Zealand)UNSPECIFIED
Atomic Energy Commission (Pakistan)UNSPECIFIED
Ministry of Science and Higher Education (Poland)UNSPECIFIED
National Science Centre (Poland)UNSPECIFIED
Fundação para a Ciência e a Tecnologia (FCT)UNSPECIFIED
Joint Institute for Nuclear Research (JINR)UNSPECIFIED
Ministry of Education and Science of the Russian FederationUNSPECIFIED
RosAtomUNSPECIFIED
Russian Academy of SciencesUNSPECIFIED
Russian Foundation for Basic ResearchUNSPECIFIED
Ministry of Education, Science and Technological Development (Serbia)UNSPECIFIED
Swiss Funding AgenciesUNSPECIFIED
ETH Board UNSPECIFIED
ETH Zurich UNSPECIFIED
Paul Scherrer InstituteUNSPECIFIED
Swiss National Science Foundation (SNSF)UNSPECIFIED
University of ZurichUNSPECIFIED
Canton ZurichUNSPECIFIED
Ministry of Science and Technology (Taipei)UNSPECIFIED
Thailand Center of Excellence in PhysicsUNSPECIFIED
Institute for the Promotion of Teaching Science and Technology (Thailand)UNSPECIFIED
Special Task Force for Activating Research (Thailand)UNSPECIFIED
National Science and Technology Development Agency (Thailand)UNSPECIFIED
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK)UNSPECIFIED
Türkiye Atom Enerjisi Kurumu (TAEK)UNSPECIFIED
National Academy of Science of Ukraine (NASU)UNSPECIFIED
State Fund for Fundamental Research (Ukraine)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
NSFUNSPECIFIED
Marie Curie FellowshipUNSPECIFIED
European Research Council (ERC)UNSPECIFIED
EPLANETUNSPECIFIED
European UnionUNSPECIFIED
Leventis Foundation UNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Alexander von Humboldt FoundationUNSPECIFIED
Belgian Federal Science Policy Office (BELSPO)UNSPECIFIED
Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium)UNSPECIFIED
Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium)UNSPECIFIED
Ministry of Education, Youth and Sports (MEYS) of the Czech RepublicUNSPECIFIED
Council of Science and Industrial Research (India)UNSPECIFIED
HOMING PLUS programme of Foundation for Polish ScienceUNSPECIFIED
European Regional Development FundUNSPECIFIED
Mobility Plus programUNSPECIFIED
Harmonia Program2014/14/M/ST2/00428
OPUS Program2014/13/B/ST2/02543
OPUS Program2013/11/B/ST2/04202
OPUS Program2014/15/B/ST2/03998
Sonata-bis Program2012/07/E/ST2/01406
Thalis ProgramUNSPECIFIED
Aristeia ProgramUNSPECIFIED
European Social FundUNSPECIFIED
Greek National Strategic Reference Framework (NSRF)UNSPECIFIED
Qatar National Research Fund National Priorities Research ProgramUNSPECIFIED
Programa Clarín-COFUND del Principado de AsturiasUNSPECIFIED
Rachadapisek Sompot Fund for Postdoctoral Fellowship Chulalongkorn University (Thailand)UNSPECIFIED
Chulalongkorn Academic into Its 2nd Century Project Advancement Project (Thailand)UNSPECIFIED
Robert A. Welch FoundationC-1845
State Secretariat for Education and Research (SER)UNSPECIFIED
Subject Keywords:Flavour Changing Neutral Currents, Hadron-Hadron scattering (experiments), Top physics
Record Number:CaltechAUTHORS:20171004-113042217
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20171004-113042217
Official Citation:The CMS collaboration, Sirunyan, A.M., Tumasyan, A. et al. J. High Energ. Phys. (2017) 2017: 3. https://doi.org/10.1007/JHEP07(2017)003
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:82059
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:05 Oct 2017 17:24
Last Modified:05 Oct 2017 17:24

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