Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-06-11
Phys.Rev.D76:015012,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 25 figures, version to appear in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.76.015012
In the frameworks of the littlest Higgs($LH$) model and its extension with T-parity($LHT$), we studied the associated $t\bar th^0$ 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.
Hao Sun
Kai Pan
Liang Han
Ren-You Zhang
Wen-gan Ma
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