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Search for top-quark partners with charge 5/3 in the same-sign dilepton final state

The CMS collaboration
Phys.Rev.Lett. 112 (2014) 171801, 2014

Abstract (data abstract)
CERN-LHC. A 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 inverse femtobarns and was collected at sqrt(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.

  • Table 1

    Data from Figure 1


    The distribution of HT for all channels combined after the full selection except for the HT requirement itself.

  • Table 2

    Data from Figure 2


    Expected and observed 95% CL limits on the $\mathrm{T}_{5/3}$ production cross section times the branching fraction for decay to same-sign...

  • Table 3

    Data from Figure 3


    The distribution of HT for all channels combined, after the requirement of same- sign dileptons, the Z-boson veto, and a...

  • Table 4

    Data from Figure 4


    The distribution of the reconstructed $\mathrm{T}_{5/3}$ mass for the data, the background, and three signal mass points.

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