Top quark rare three-body decays in the littlest Higgs model with T-parity

Abstract

In the littlest Higgs model with T-parity (LHT), the mirror quarks have flavor structures and will contribute to the top quark flavor changing neutral current. In this work, we perform an extensive investigation of the top quark rare three-body decays $t\to cVV(V=\gamma ,Z,g)$ and $t\to cf\bar{f}(f=b,\tau ,\mu ,e)$ at one-loop level. Our results show that the branching ratios of $t\to cgg$ and $t\to cb\bar{b}$ could reach $\mathcal{O}(10^{-3})$ in the favorite parameter space of the littlest Higgs model with T-parity, which implies that these decays may be detectable at the LHC or ILC, while for the other decays, their rates are too small to be observable at the present or future colliders.

arXiv comment12 pages, 10 figures

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• Physics at the e+ e- Linear Collider
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• Top Quark FCNC Decay to 125GeV Higgs boson in the Littlest Higgs Model with T-parity
• Probing the top quark flavor-changing couplings at CEPC
• The anomalous top quark coupling tqg and tW production at the LHC
• Rare decay $t\to c\gamma \gamma$ via scalar leptoquark doublets
• Rare Higgs three body decay induced by top-Higgs FCNC coupling in the littlest Higgs Model with T-parity