Chatrchyan, S.Khachatryan, V.Sirunyan, A. M.Tumasyan, A.Adam, W.Bergauer, T.The CMS Collaboration2025-03-072025-03-0720140031-90071079-7114https://doi.org/10.1103/PhysRevLett.112.171801https://hdl.handle.net/20.500.12507/2856A search for the production of heavy partners of the top quark with charge 5/3 is performed in events with a pair of same-sign leptons. The data sample corresponds to an integrated luminosity of 19.5 fb(-1) and was collected at root s = 8 TeV by the CMS experiment. No significant excess is observed in the data above the expected background, and the existence of top-quark partners with masses below 800 GeV is excluded at a 95% confidence level, assuming they decay exclusively to tW. This is the first limit on these particles from the LHC, and it is significantly more restrictive than previous limits.eninfo:eu-repo/semantics/openAccessArticle11217WOS:0003358167000052483623710.1103/PhysRevLett.112.171801Q1