# Search for top quark partners with charge 5/3 in proton-proton collisions at $\sqrt{s} = 13$ TeV

## Abstract

A 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.

## Abstract

A 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.

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2017 16 Oct 2017 15:52 19 Feb 2018 08:51 Springer 1029-8479 Gold Publisher DOI. An embargo period may apply. https://doi.org/10.1007/JHEP08(2017)073 https://arxiv.org/abs/1705.10967

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