FCNC Top Quark Decays in Extra Dimensions

Abstract

The flavor changing neutral top quark decay t -> c X is computed, where X is a neutral standard model particle, in a extended model with a single extra dimension. The cases for the photon, X= γ$,andaStandardModelHiggsboson,X=H,areanalyzedindetailinanon-linear$R_ξgauge. We find that the branching ratios can be enhanced by the dynamics originated in the extra dimension. In the limit where 1/R >> ->, we have found Br(t -> c γ) \simeq 10^{-10} for 1/R = 0.5 TeV. For the decay t -> c H, we have found Br(t -> cH) \simeq 10^{-10} for a low Higgs mass value. The branching ratios go to zero when 1/R -> \infty.

Accepted to be published in the Europ. Phys. Jour. C; 16 pages, 2 figures

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• Rare top decay $t\to c\gamma$ with flavor changing neutral scalar interactions in two Higgs doublet model
• Study of anomalous top quark FCNC interactions via $tW$-channel of single top
• Limits on the anomalous $Wtq$ couplings
• Probing the Top Quark Flavour-Changing Neutral Current at a Future Electron-Positron Collider
• Study of the Top Quark FCNC
• Flavor changing neutral current decays $t\to cX$ ($X=\gamma ,g,Z,H$) and $t\to c\bar{\ell }\ell$ ($\ell =\mu ,\tau$) via scalar leptoquarks
• Flavor-changing decays of the top quark in 5D warped models
• Decay $t->c\gamma$ in models with SU_L(3)XU_X(1) gauge symmetry
• Top Rare Decays t-> cV in the Mirror Twin Higgs Models
• Rare decays of the top quark mediated by Z' gauge bosons and flavor violation
• Rare decay $t\to c\gamma \gamma$ via scalar leptoquark doublets