New gauge bosons from the littlest Higgs modeland the process $e^{ + }e^{-}rightarrow tbar{t}$期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

New gauge bosons from the littlest Higgs modeland the process $e^{ + }e^{-}rightarrow tbar{t}$

Authors:	Chong-Xing?Yue author-information" > author-information__contact u-icon-before" > mailto:cxyue@lnnu.edu.cn" title=" cxyue@lnnu.edu.cn" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author,Lei?Wang,Jian-Xing?Chen

Affiliation:	(1) Department of Physics, Liaoning Normal University, 116029 Dalian, P.R. China

Abstract:	In the context of the littlest Higgs (LH) model, we study the process $e^{ + }e^{-}rightarrow tbar{t}$ . We find that the new gauge bosons Z _H and B _H can produce significant correction effects on this process, which can be further enhanced by suitably polarized beams. In most of the parameter space preferred by the electroweak precision data, the absolute value of the relative correction parameter $R_{B_{H}}$ is larger than 5 %. As long as $1 {mathrm {TeV}} leq M_{Z_{H}}leq 1.5 {mathrm {TeV}}$ and the absolute value of the relative correction parameter $R_{Z_{H}}$ is larger than . With reasonable values of the parameters of the LH model, the possible signals of the new gauge bosons B _H and Z _H can be detected via the process $e^{ + }e^{-}rightarrow tbar{t}$ in the future LC experiments with the CM energy . B _H exchange and Z _H exchange can generate significantly corrections to the forward-backward asymmetry $A_{mathrm {{FB}}}(tbar{t})$ only in a small part of the parameter space.Received: 29 October 2004, Revised: 29 November 2004, Published online: 15 February 2005

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