Flavor-Changing Top Quark Rare Decays in the Littlest Higgs Model with T-Parity
Abstract
Description
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 $t\to c V, (V=g,γ,Z)$ 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 $Br(t\to cγ)\sim 10^{-7}$ in the favorite parameter space in the LHT model.
12 pages, 3 figures
12 pages, 3 figures