The effects of the little Higgs models on $t\bar{t}{h}^0$ production via $\gamma \gamma$ collision at linear colliders

Abstract

In the frameworks of the littlest Higgs($LH$) model and its extension with T-parity($LHT$), we studied the associated $t\bar{t}{h}^0$ production process $e^{+}{e}^{-}\to \gamma \gamma \to t\bar{t}{h}^0$ at the future $e^{+}{e}^{-}$ linear colliders up to QCD next-to-leading order. We present the regions of $\sqrt{s}-f$ parameter space in which the $LH$ and $LHT$ effects can and cannot be discovered with the criteria assumed in this paper. The production rates of process $\gamma \gamma \to t\bar{t}{h}^0$ in different photon polarization collision modes are also discussed. We conclude that one could observe the effects contributed by the $LH$ or $LHT$ model on the cross section for the process $e^{+}{e}^{-}\to \gamma \gamma \to t\bar{t}{h}^0$ in a reasonable parameter space, or might put more stringent constraints on the $LH$/$LHT$ parameters in the future experiments at linear colliders.

22 pages, 25 figures, version to appear in Phys. Rev. D

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• The LHC di-photon Higgs signal predicted by little Higgs models
• Associated production of the Higgs boson and a single top quark in the littlest Higgs model at Large Hadron Collier
• $W_H$-pair Production in the Littlest Higgs Model with T parity in next-to-leading order QCD at LHC
• Rare Z-decay into light pseudoscalar bosons in the simplest little Higgs model
• On-shell $WW\gamma$ vertex in the T-Parity and non T-Parity Littlest Higgs model
• Pseudoscalar boson and SM-like Higgs boson productions at LHC in simplest little Higgs model
• R_b Constraints on Littlest Higgs Model with T-parity