Flavor-Changing Top Quark Rare Decays in the Littlest Higgs Model with T-Parity

Abstract

We analyze the rare and flavor changing decay of the top quark into a charm quark and a gauge boson in the littlest Higgs model with T-parity (LHT). We calculate the one-loop level contributions from the T-parity odd mirror quarks and gauge bosons. We find that the decay $t\to cV,(V=g,\gamma ,Z)$ in the LHT model can be significantly enhanced relative to those in the Standard Model. Our numerical results show that the top quark FCNC decay can be as large as $Br(t\to cg)\sim 10^{-2}$, $Br(t\to cZ)\sim 10^{-5}$ and $Br(t\to c\gamma )\sim 10^{-7}$ in the favorite parameter space in the LHT model.

12 pages, 3 figures

References in corpus (2)

• Another Look at the Flavour Structure of the Littlest Higgs Model with T-Parity
• New Physics effects in the flavor-changing neutral couplings of the Top quark

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• R_b Constraints on Littlest Higgs Model with T-parity
• Signature of same-sign top pair production mediated by a nonuniversal $Z^{\prime }$ with QCD next-to-leading accuracy at the LHC
• The littlest Higgs model with T-parity and single top production at $ep$ collision