Top Quark Rare Decays via Loop-Induced FCNC Interactions in Extended Mirror Fermion Model

Abstract

Flavor changing neutral current (FCNC) interactions for a top quark $t$ decays into $Xq$ with $X$ represents a neutral gauge or Higgs boson, and $q$ a up- or charm-quark are highly suppressed in the Standard Model (SM) due to the Glashow-Iliopoulos-Miami mechanism. Whilst current limits on the branching ratios of these processes have been established at the order of $10^{-4}$ from the Large Hadron Collider experiments, SM predictions are at least nine orders of magnitude below. In this work, we study some of these FCNC processes in the context of an extended mirror fermion model, originally proposed to implement the electroweak scale seesaw mechanism for non-sterile right-handed neutrinos. We show that one can probe the process $t\to Zc$ for a wide range of parameter space with branching ratios varying from $10^{-6}$ to $10^{-8}$, comparable with various new physics models including the general two Higgs doublet model with or without flavor violations at tree level, minimal supersymmetric standard model with or without $R$-parity, and extra dimension model.

30 pages, 8 figures, 2 tables and 1 appendix. Version to appear in NPB

References in corpus (8)

• Collider Signals of Top Quark Flavor Violation from a Warped Extra Dimension
• SUSY-induced FCNC top-quark processes at the Large Hadron Collider
• Composite Higgs-Mediated FCNC
• A model of electroweak-scale right-handed neutrino mass
• Next-to-leading order QCD corrections to the top quark decay via model-independent FCNC couplings
• Electroweak-scale mirror fermions, $\mu \to e\gamma$ and $\tau \to \mu \gamma$
• Probing the Top Quark Flavour-Changing Neutral Current at a Future Electron-Positron Collider
• A non-vanishing neutrino mass and the strong CP problem: A new solution from the perspective of the EW-${\nu }_R$ model

Cited by in corpus (6)

• Search for flavour-changing neutral current top-quark decays $t\to qZ$ in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Topologically stable, finite-energy electroweak-scale monopoles
• Probing tqZ anomalous couplings in the trilepton signal at the HL-LHC, HE-LHC and FCC-hh
• Search for flavor-changing neutral-current couplings between the top quark and the $Z$ boson with proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Climbing to the Top of the ATLAS 13 TeV data
• Leveraging on-shell interference to search for FCNCs of the top quark and the Z boson