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

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Abstract

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 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.

Published Plots from Phys. Rev. Lett. 112, 171801

Figure Caption
click on it to get it The distribution of HT for all channels combined after the full selection except for the HT requirement itself. The shaded band represents the total uncertainty in the predicted backgrounds. The final bin includes all overflow events. The pull is defined as the difference between the observed and expected values divided by the total uncertainty.
click on it to get it Expected and observed 95% C.L. limits on the T5/3 production cross section. The 1-sigma and 2-sigma combined statistical and systematic expected variation is shown as a yellow (light) and green (dark) band, respectively.

Supplemental Plots from Phys. Rev. Lett. 112, 171801

Figure Caption
click on it to get it The distribution of HT in all channels combined after the same-sign selection, the Z/quarkonia lepton invariant mass veto and a requirement of at least two jets.
click on it to get it The distribution of the reconstructed T5/3 mass for the data, the background, and three signal mass points. The background is dominated by the contribution due to non-prompt leptons and also contains much smaller contributions due to ttbarW, ttbarWW, ttbarZ, WWW, same-sign WW, and charge misidentification. The shaded band represents the total uncertainty in the predicted background.

Unpublished Plots and Material from Other Sources

Figure Abbreviated Caption
click on it to get it Pair production of T5/3 quarks via gluon fusion and decay to same-sign dilepton final states. Figure taken from arXiv:0801.1679 .
click on it to get it Event 25787738 from run 208357.
click on it to get it Event 275039437 from run 199699.
click on it to get it 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.
click on it to get it 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.
click on it to get it 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.
click on it to get it 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.
click on it to get it 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.
click on it to get it 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.
click on it to get it 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.
click on it to get it 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.
click on it to get it 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.
click on it to get it 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.
click on it to get it 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.
click on it to get it 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.
click on it to get it 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.
click on it to get it 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.
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Topic revision: r6 - 2015-03-04 - AlexanderSchmidt
 
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