Sirunyan, A. M.Tumasyan, A.Adam, W.Asilar, E.Bergauer, T.Brandstetter, J.Brondolin, E.2025-03-232025-03-2320171029-8479https://doi.org/10.1007/JHEP08(2017)073https://hdl.handle.net/11486/7106A search for the production of heavy partners of the top quark with charge 5/3 (X-5/3) decaying into a top quark and a W boson is performed with a data sample corresponding to an integrated luminosity of 2.3 fb(-1), collected in proton-proton collisions at a center-of-mass energy of 13 TeV with the CMS detector at the CERN LHC. Final states with either a pair of same-sign leptons or a single lepton, along with jets, are considered. No significant excess is observed in the data above the expected standard model background contribution and an X-5/3 quark with right-handed (left-handed) couplings is excluded at 95% confidence level for masses below 1020 (990) GeV. These are the first limits based on a combination of the same-sign dilepton and the single-lepton final states, as well as the most stringent limits on the X-5/3 mass to date.eninfo:eu-repo/semantics/openAccessBeyond Standard ModelExoticsHadron-Hadron scattering (experiments)Top physicsArticle810.1007/JHEP08(2017)0732-s2.0-85028345368Q1WOS:000408575800001Q1