CMS Collaboration, Adair, A., Akgun, B., et al.. "Search for Top-Quark Partners with Charge 5/3 in the Same-Sign Dilepton Final State." Physical Review Letters, 112, (2014) 171801. http://dx.doi.org/10.1103/PhysRevLett.112.171801.
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 fb−1 and was collected at √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.
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