Search for top quark flavour changing neutral currents in same-sign top quark production

Abstract

The presence of the anomalous top quark flavour changing neutral current (FCNC) interactions leads to the production of same-sign top quarks in proton-proton collisions. The results of a search for events with same-sign dileptons and b-jets conducted by CMS collaboration with 10.5 $f{b}^{-1}$ of data collected in pp colisions at $\sqrt{s}=8$ TeV are used to obtain the constraints on the strength of top quark FCNC interactions. The 95 confidence level upper limits on the branching ratios of top quark decays to a light quark $q=u,c$ and a gauge or a Higgs boson are set to be $\mathcal{B}R(t\to u\gamma )<1.27$, $\mathcal{B}R(t\to uZ)<0.8$, $\mathcal{B}R(t\to ug)<1.02$ and $\mathcal{B}R(t\to uH)<4.21$. The sensitivity of future searches in the same-sign top quark channel is also presented.

typos fixed, Refs. added (published version)

References in corpus (12)

• PYTHIA 6.4 Physics and Manual
• A minimal set of top-Higgs anomalous couplings
• SUSY-induced FCNC top-quark processes at the Large Hadron Collider
• Search for anomalous production of events with three or more leptons in pp collisions at sqrt(s) = 8 TeV
• Top Quark Forward-Backward Asymmetry and Same-Sign Top Quark Pairs
• Search for new physics in events with same-sign dileptons and b-tagged jets in pp collisions at sqrt(s) = 7 TeV
• Search for top quark decays $t\to qH$ with $H\to \gamma \gamma$ using the ATLAS detector
• Search for flavor changing neutral currents via quark-gluon couplings in single top quark production using 2.3 fb^-1 of ppbar collisions
• Disentangling Flavor Violation in the Top-Higgs Sector at the LHC
• SUSY induced top quark FCNC decay $t\to ch$ after Run I of LHC
• Rare Top-quark Decays to Higgs boson in MSSM
• Same-sign Tops: A Powerful Diagnostic Test for Models of New Physics

Cited by in corpus (3)

• Photon initiated single top quark production via flavor-changing neutral currents at the LHC
• Top quark anomalous FCNC production via $tqg$ couplings at FCC-hh
• Signs of Tops from Highly Mixed Stops