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No. of bitstreams: 0 Previous issue date: 2019-04-26 BMBWF (Austria) FWF (Austria) FNRS (Belgium) FWO (Belgium) 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) FAPERGS (Brazil) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) MES (Bulgaria) CERN CAS (China) MoST (China) NSFC (China) COLCIENCIAS (Colombia) MSES (Croatia) CSF (Croatia) RPF (Cyprus) SENESCYT (Ecuador) MoER (Estonia) ERC IUT (Estonia) ERDF (Estonia) Academy of Finland (Finland) MEC (Finland) HIP (Finland) CEA (France) CNRS/IN2P3 (France) BMBF (Germany) DFG (Germany) HGF (Germany) GSRT (Greece) NKFIA (Hungary) DAE (India) DST (India) IPM (Iran) SFI (Ireland) INFN (Italy) MSIP (Republic of Korea) NRF (Republic of Korea) MES (Latvia) LAS (Lithuania) MOE (Malaysia) UM (Malaysia) BUAP (Mexico) CINVESTAV (Mexico) CONACYT (Mexico) LNS (Mexico) SEP (Mexico) UASLPFAI (Mexico) MOS (Montenegro) MBIE (New Zealand) PAEC (Pakistan) MSHE (Poland) NSC (Poland) FCT (Portugal) JINR (Dubna) MON (Russia) RosAtom (Russia) RAS (Russia) RFBR (Russia) NRC KI (Russia) MESTD (Serbia) SEIDI (Spain) CPAN (Spain) PCTI (Spain) FEDER (Spain) MOSTR (Sri Lanka) Swiss Funding Agencies (Switzerland) MST (Taipei) ThEPCenter (Thailand) IPST (Thailand) STAR (Thailand) NSTDA (Thailand) TUBITAK (Turkey) TAEK (Turkey) NASU (Ukraine) SFFR (Ukraine) STFC (United Kingdom) DOE (USA) NSF (USA) Marie-Curie program (European Union) European Research Council (European Union) Horizon 2020 Grant (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 doorWetenschap en Technologie (IWT-Belgium) F.R.S.-FNRS (Belgium) under the Excellence of Science - EOS - be.h project FWO (Belgium) under the Excellence of Science - EOS - be.h project Ministry of Education, Youth and Sports (MEYS) of the Czech Republic Lendulet (Momentum) Program (Hungary) Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences (Hungary) New National Excellence Program UNKP (Hungary) Council of Science and Industrial Research, India HOMING PLUS program of the Foundation for Polish Science Regional Development Fund (Poland) Mobility Plus program of the Ministry of Science and Higher Education (Poland) National Science Center (Poland) National Priorities Research Program by Qatar National Research Fund A search for the pair production of heavy vector-like partners T and B of the top and bottom quarks has been performed by the CMS experiment at the CERN LHC using proton-proton collisions at . The data sample was collected in 2016 and corresponds to an integrated luminosity of 35.9 production include those where one of the T quarks decays via TtZ and the other via TbW, tZ, or tH, where H is a Higgs boson. For the BB case, final states include those where one of the B quarks decays via BbZ and the other BtW, bZ, or bH. Events with two oppositely charged electrons or muons, consistent with coming from the decay of a Z boson, and jets are investigated. The number of observed events is consistent with standard model background estimations. Lower limits at 95% confidence level are placed on the masses of the T and B quarks for a range of branching fractions. Assuming 100% branching fractions for TtZ, and BbZ, T and B quark mass values below 1280 and 1130 respectively, are excluded. 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