Search for vector-like quarks in events with two oppositely charged leptons and jets in proton\u2013proton collisions at sqrt{s} = 13,text {Te}text {V}

A M Sirunyan,A Makovec,P Gunnellini,A Parker,D J Karmgard,A Lanaro,E Meschi,F Meijers,S Brandt,G I Veres,C Schnaible,R Wolf,G Mitselmakher,M Selvaggi,E Laird,M Azarkin,M Pierini,R Chudasama,K Dilsiz,Aashaq Shah,J Salfeld-Nebgen,A Harb,M Wolf,J Wang,K Tatar,N Woods,S Ragazzi,F Hartmann,J Mans,N J Hadley,K Piotrzkowski,K Klein,A Nayak,R Walsh,G Karapinar,B Clerbaux,V D Elvira,M Costa,A Ghezzi,P Lecoq,U Behrens,C Mironov,W Shi,H Liu,D Brzhechko,H A Weber,S Gninenko,P Klabbers,M Dünser,G Hanson,B Marzocchi,P A Razis,L Sulak,O Turkot,P K Behera,J P Chou,J Berryhill,J Roberts,G Karapostoli,A Giassi,R Hadjiiska,P Bargassa,I Evangelou,O Bouhali,Y Chen,O Toldaiev,T Bose,N Demaria,J Bendavid,G Latino,J Knolle,A C Marini,S F Novaes,O Kara,V Sharma,K Bloom,G Zumerle,D Vannerom,V Danilov,L Moreels,C Freer,Y Cheng,S My,R Fischer,A Zhang,M Dalchenko,D Fasanella,C Campagnari,J Damgov,J Incandela,J F De Trocóniz,J F Schulte,S R Wagner,A Hervé,A Mahrous,O Karacheban,M Margoni,A Whitbeck,A Purohit,Z L Trocsanyi,V Daponte,S Malvezzi,G Petrucciani,S Pandey,C Schäfer,J Tuominiemi,C Veelken,R Syarif,E Wolfe,R Leonardi,G Negro,N Tyurin,H Qiu,A Pyskir,S B Oh,K Tos,N Neumeister,G Mavromanolakis,A Kaur,S Thüer,P Govoni,R Kinnunen,C Caillol,W Lohmann,P J Fernández Manteca,S Wertz,I Bayshev,G Mantovani,D Carlsmith,S Freed,V Bhopatkar,J Alexander,C Grab,F Blekman,W Lustermann,G Rolandi,V Kim,S Sagir,V Sola,K Pedro,A Levin,W Ko,K Kousouris,M A Harrendorf,A Rosowsky,A Popov,A Moraes,L Spiegel,M Marionneau,J Velkovska,A Petrilli,M Haranko,P Rumerio,D M Newbold,E Garutti,E Paganis,M Bharti,A Muhammad,E Barberis,Y Jo,N Faltermann,M Hohlmann,A Stepennov,F Ptochos,G Karathanasis,M Bachtis,R Schöfbeck,J Zhang,E Butz,S Kaplan,I Smirnov,S Muthumuni,G Dissertori,A Raspereza,V Mossolov,T Boccali,J K Heikkilä,A Buccilli,E Robutti,E Conte,O Prokofyev,G Organtini,N Marinelli,J Goh,V M Ghete,V Gavrilov,C Zorbilmez,V Sordini,G Steinbrück,T Mengke,E Asilar,W Verbeke,A Reimers,D Zuolo,D R Claes,J Strait,S Folgueras,S V Gleyzer,V Oreshkin,E Tziaferi,E Vlasov,S Taroni,N Krammer,C Charlot,J Wittmann,N Suwonjandee,A Volkov,M Olszewski,B Vermassen,A Psallidas,D Rosenzweig,C Collard,J Keaveney,M Alyari,K Burt,M Gavrilenko,A Romero,M Bluj,A Nehrkorn,P Cirkovic,P Merkel,I Papavergou,D Velicanu,O Baron,L Lyons,T Aushev,J Karancsi,J Lee,P Baringer,D Pitzl,A Grebenyuk,S Kwan,G Auzinger,G Galati,M Gul,S W Lee,I Lokhtin,I Vorobiev,P Katsoulis,C Reissel,M Mulhearn,M Cremonesi,I D Reid,J Rander,F Moortgat,S Girgis,H Sakulin,C Amsler,P Parygin,G A Alves,D M Raymond,M Narain,J.-L Agram,E Paradas,P Harris,F Micheli,L Fanò,J Mnich,S Baidali,Y Roh,P Lariccia,C Seitz,T Aziz,M Mannelli,P Thomassen,M Galanti,T Bergauer,N Srimanobhas,C Leloup,H Keller,M Grothe,Z Zolkapli,M Toms,M Erdmann,P Thapa,D H Zhu,Z Demiragli,K Kaadze,R Wallny,C Smith,C Foudas,C Beirão Da Cruz E Silva,J Kamin,P David,D Lontkovskyi,E Gottschalk,S Erdweg,E Focardi,S Flowers,J D’Hondt,B L Winer,F L Alves,B Wang,R M Chatterjee,S Pigazzini,T 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,M Calderón De La Barca Sánchez ,B Ujvári

doi:10.1140/epjc/s10052-019-6855-8

Abstract

A search for the pair production of heavy vector-like partners mathrm {T} and mathrm {B} of the top and bottom quarks has been performed by the CMS experiment at the CERN LHC using proton–proton collisions at sqrt{s} = 13,text {Te}text {V} . The data sample was collected in 2016 and corresponds to an integrated luminosity of 35.9,text {fb}^{-1}. Final states studied for mathrm {T} overline{mathrm {T}} production include those where one of the mathrm {T} quarks decays via mathrm {T} rightarrow mathrm {t}mathrm {Z} and the other via mathrm {T} rightarrow mathrm {b}mathrm {W}, mathrm {t}mathrm {Z}, or mathrm {t}mathrm {H} , where mathrm {H} is a Higgs boson. For the mathrm {B} overline{mathrm {B}} case, final states include those where one of the mathrm {B} quarks decays via mathrm {B} rightarrow mathrm {b}mathrm {Z} and the other mathrm {B} rightarrow mathrm {t}mathrm {W}, mathrm {b}mathrm {Z}, or mathrm {b}mathrm {H} . Events with two oppositely charged electrons or muons, consistent with coming from the decay of a mathrm {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 mathrm {T} and mathrm {B} quarks for a range of branching fractions. Assuming 100% branching fractions for mathrm {T} rightarrow mathrm {t}mathrm {Z}, and mathrm {B} rightarrow mathrm {b}mathrm {Z}, mathrm {T} and mathrm {B} quark mass values below 1280 and 1130,text {Ge}text {V}, respectively, are excluded.

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