Abstract
A search is performed for the pair production of spin-3/2 excited top quarks, each decaying to a top quark and a gluon. The search uses the data collected with the CMS detector from proton–proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1. Events are selected by requiring an isolated muon or electron, an imbalance in the transverse momentum, and at least six jets of which exactly two must be compatible with originating from the fragmentation of a bottom quark. No significant excess over the standard model predictions is found. A lower limit of 1.2 TeV is set at 95% confidence level on the mass of the spin-3/2 excited top quark in an extension of the Randall–Sundrum model, assuming a 100% branching fraction of its decay into a top quark and a gluon. These are the best limits to date in a search for excited top quarks and the first at 13 TeV.
Original language | English |
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Pages (from-to) | 349-370 |
Number of pages | 22 |
Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
Volume | 778 |
DOIs | |
Publication status | Published - 10 Mar 2018 |
Bibliographical note
Publisher Copyright:© 2018 The Author(s)
Funding
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: 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 (USA). 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: 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 (USA).
Funders | Funder number |
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Not added | ST/I000410/1, ST/I002200/1, ST/I005912/1, ST/J005665/1, ST/K001604/1, ST/N000242/1 |
CPAN | |
ERC IUT | |
LNS | |
MESTD | |
MON | |
MSES | |
MSHE | |
MoER | |
STAR | |
Swiss Funding Agencies | |
TUBITAK | |
UASLP-FAI | |
National Science Foundation | 1606321, 1151640, 1506168, 1506130, 1508869 |
National Institutes of Health | |
U.S. Department of Energy | |
Hispanics in Philanthropy | |
Human Growth Foundation | |
California Department of Fish and Wildlife | |
Ministry of Science and Technology | |
Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS) | |
Children's Specialists Foundation | |
California Earthquake Authority | |
Ministry of Education | |
Secretaría de Educación Pública | |
Türkiye Atom Enerjisi Kurumu | |
Santa Fe Institute | |
Louisiana Academy of Sciences | |
Rochester Academy of Science | |
National Research Foundation | |
Missouri University of Science and Technology | |
Medical Engineering Centre, King’s College London | |
CERN | |
University of Washington College of Arts and Sciences | |
Thailand Center of Excellence in Physics | |
Cosmetic Surgery Foundation | |
Institute for the Promotion of Teaching Science and Technology | |
Science and Technology Facilities Council | ST/F006748/1, ST/J004901/1, ST/G502347/1, GRIDPP |
National Stroke Foundation | |
Department of Science and Technology, Ministry of Science and Technology, India | |
Ministry of Education - Singapore | |
Department of Atomic Energy, Government of India | |
Taighde Éireann - Research Ireland | |
Helmholtz-Gemeinschaft | |
Deutsche Forschungsgemeinschaft | |
Fundação de Amparo à Pesquisa do Estado de São Paulo | |
National Natural Science Foundation of China | |
Research Promotion Foundation | |
National Science Council | |
Fundação para a Ciência e a Tecnologia | |
Russian Foundation for Basic Research | |
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior | |
Academy of Finland | |
Bundesministerium für Bildung und Forschung | |
Chinese Academy of Sciences | |
Austrian Science Fund | |
Fonds De La Recherche Scientifique - FNRS | |
Russian Academy of Sciences | |
Fonds Wetenschappelijk Onderzoek | |
Consejo Nacional de Ciencia y Tecnología | |
Ministerio de Economía y Competitividad | |
Bundesministerium für Wissenschaft, Forschung und Wirtschaft | |
General Secretariat for Research and Technology | |
Ministry of Business, Innovation and Employment | |
Hungarian Scientific Research Fund | |
Conselho Nacional de Desenvolvimento Científico e Tecnológico | |
Ministry of Science, ICT and Future Planning | |
National Research Foundation of Korea | |
Joint Institute for Nuclear Research | |
Instituto Nazionale di Fisica Nucleare | |
Ministry of Science ICT and Future Planning | |
National Science and Technology Development Agency | Thailand |
Secretaría de Educación Superior, Ciencia, Tecnología e Innovación | |
Universiti Malaya | |
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro | |
Ministry of Science and Technology, Taiwan | |
National Academy of Sciences of Ukraine | |
Centre National de la Recherche Scientifique | |
Ministry of Education and Science | |
Institute for Research in Fundamental Sciences | |
Benemérita Universidad Autónoma de Puebla | |
Commissariat à l'Énergie Atomique et aux Énergies Alternatives | |
Bundesministerium für Bildung und Frauen | |
Secretaría de Estado de Investigación, Desarrollo e Innovación | |
European Regional Development Fund | |
State Atomic Energy Corporation ROSATOM | |
Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional | |
Pakistan Atomic Energy Commission | |
State Fund for Fundamental Research of Ukraine | |
Department of Science and Technology, Government of West Bengal | |
Fundació Catalana de Trasplantament | |
Univerza v Mariboru | |
Institut National de Physique Nucléaire et de Physique des Particules |
Keywords
- Beyond two generations
- CMS
- Excited top quark
- Physics