Sirunyan A.M.Tumasyan A.Adam W.Ambrogi F.Asilar E.Bergauer T.Brandstetter J.2024-03-132024-03-1320191126-6708https://doi.org/10.1007/JHEP03(2019)082https://hdl.handle.net/20.500.12662/3006A search for the pair production of heavy fermionic partners of the top quark with charge 5/3 (X 5/3 ) is performed in proton-proton collisions at a center-of-mass energy of 13 TeV with the CMS detector at the CERN LHC. The data sample analyzed corresponds to an integrated luminosity of 35.9 fb ?1 . The X 5/3 quark is assumed always to decay into a top quark and a W boson. Both the right-handed and left-handed X 5/3 couplings to the W boson are considered. Final states with either a pair of same-sign leptons or a single lepton are studied. No significant excess of events is observed above the expected standard model background. Lower limits at 95% confidence level on the X 5/3 quark mass are set at 1.33 and 1.30 TeV respectively for the case of right-handed and left-handed couplings to W bosons in a combination of the same-sign dilepton and single-lepton final states.[Figure not available: see fulltext.] © 2019, The Author(s).eninfo:eu-repo/semantics/openAccessBeyond Standard ModelHadron-Hadron scattering (experiments)Top physicsArticle10.1007/JHEP03(2019)0822-s2.0-850632677543N/A2019