Littlest Higgs model and top-charm production at high-energy linear colliders

Abstract

Due to the presence of extra top quark T in the little Higgs models, the CKM matrix is not unitary and the flavor changing neutral currents may exist at the tree level. In the context of the Littlest Higgs(LH) model, we discuss the topcharm production at the high-energy linear e + e − collider (LC) via the processes e + e − → tc + tc, e + e − → (tc + tc)ν e ν e , and e − γ → e − tc. We find that the resonance production cross section for the process e + e − → tc + tc is significantly larger, which can be detected in future LC experiments.