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 top-charm production at the high-energy linear $e^{+}{e}^{-}$ collider $(LC)$ via the processes $e^{+}{e}^{-}\to \bar{t}c+t\bar{c}$, $e^{+}{e}^{-}\to (\bar{t}c+t\bar{c}){\nu }_e\overline{{\nu }_e}$, and $e^{-}\gamma \to e^{-}\bar{t}c$. We find that the resonance production cross section for the process $e^{+}{e}^{-}\to \bar{t}c+t\bar{c}$ is significantly larger, which can be detected in future $LC$ experiments.

arXiv commentlatex files, 13 pages, 5 figures. References added and some typos corrected

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Cited by in corpus (2)

• Physics at the e+ e- Linear Collider
• Higgs mediated flavor violating top quark decays t --> u_i H, u_i gamma, u_i gamma gamma, and the process gamma gamma --> t c in effective theories