The CMS collaboration, Sirunyan A.M.Sirunyan A.M.The CMS collaborationStathes PaganisPAO-TI CHANGYEE HSIUNGKAI-FENG CHENRONG-SHYANG LUWEI-SHU HOU2021-07-282021-07-28201711266708https://www.scopus.com/inward/record.uri?eid=2-s2.0-85028345368&doi=10.1007%2fJHEP08%282017%29073&partnerID=40&md5=bcddde3a3ed4b7b1a4cecc44ad5e096dhttps://scholars.lib.ntu.edu.tw/handle/123456789/575036A search for the production of heavy partners of the top quark with charge 5/3 (X5/3) 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 X5/3 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 X5/3 mass to date.[Figure not available: see fulltext.]. ? 2017, The Author(s).journal article10.1007/JHEP08(2017)0732-s2.0-85028345368