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
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.
Figure |
Abbreviated Caption |
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Pair production of T5/3 quarks via gluon fusion and decay to same-sign dilepton final states. Figure taken from arXiv:0801.1679 . |
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Event 25787738 from run 208357. |
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Event 275039437 from run 199699. |
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The distribution of the leading lepton pT in the dielectron channel after the same-sign selection, the Z/quarkonia lepton invariant mass veto and a requirement of at least two jets. |
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The distribution of the leading lepton pT in the electron-muon channel after the same-sign selection, the Z/quarkonia lepton invariant mass veto and a requirement of at least two jets. |
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The distribution of the leading lepton pT in the dimuon channel after the same-sign selection, the Z/quarkonia lepton invariant mass veto and a requirement of at least two jets. |
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The distribution of the leading lepton pT in all channels combined after the same-sign selection, the Z/quarkonia lepton invariant mass veto and a requirement of at least two jets. |
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The distribution of the leading jet pT in the dielectron channel after the same-sign selection, the Z/quarkonia lepton invariant mass veto and a requirement of at least two jets. |
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The distribution of the leading jet pT in the electron-muon channel after the same-sign selection, the Z/quarkonia lepton invariant mass veto and a requirement of at least two jets. |
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The distribution of the leading jet pT in the dimuon channel after the same-sign selection, the Z/quarkonia lepton invariant mass veto and a requirement of at least two jets. |
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The distribution of the leading jet pT in all channels combined after the same-sign selection, the Z/quarkonia lepton invariant mass veto and a requirement of at least two jets. |
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The distribution of HT in the dielectron channel after the same-sign selection, the Z/quarkonia lepton invariant mass veto and a requirement of at least two jets. |
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The distribution of HT in the electron-muon channel after the same-sign selection, the Z/quarkonia lepton invariant mass veto and a requirement of at least two jets. |
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The distribution of HT in the dimuon channel after the same-sign selection, the Z/quarkonia lepton invariant mass veto and a requirement of at least two jets. |
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The distribution of the reconstructed T5/3 mass in the dielectron channel after the same-sign selection and the Z/quarkonia lepton invariant mass veto. |
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The distribution of the reconstructed T5/3 mass in the muon-electron channel after the same-sign selection and the Z/quarkonia lepton invariant mass veto. |
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The distribution of the reconstructed T5/3 mass in the dimuon channel after the same-sign selection and the Z/quarkonia lepton invariant mass veto. |