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	Top quark forward-backward asymmetry at the Tevatron: A comparative study in different new physics models
	Cao, JJ , Henan Normal Univ, Coll Phys & Informat Engn, Xinxiang 453007, Peoples R China; Cao, Junjie; Heng, Zhaoxia; Wu, Lei; Yang, Jin Min
刊名	PHYSICAL REVIEW D
	2010
卷号	81期号:1页码:-
关键词	R-parity Violation Topcolor-assisted Technicolor Double-beta Decay Supersymmetric Electroweak Corrections Left-right Symmetry Fermilab-tevatron Standard Model Unconstrained Mssm 3rd-family Quarks Linear Colliders
ISSN号	1550-7998
英文摘要	The top quark forward-backward asymmetry A(FB)(t) measured at the Tevatron is above the standard model prediction by more than 2 sigma deviation, which might be a harbinger for new physics. In this work we examine the contribution to A(FB)(t) in two different new physics models: one is the minimal supersymmetric model without R parity which contributes to A(FB)(t) via sparticle-mediated t channel process d (d) over bar -> t (t) over bar; the other is the third-generation enhanced left-right model which contributes to A(FB)(t) via Z'-mediated t channel or s channel processes. We find that in the parameter space allowed by the t (t) over bar production rate and the t (t) over bar invariant mass distribution at the Tevatron, the left-right model can enhance A(FB)(t) to within the 2 sigma region of the Tevatron data for the major part of the parameter space, and in optimal case A(FB)(t) can reach 12% which is slightly below the 1 sigma lower bound. For the minimal supersymmetric model without R parity, only in a narrow part of the parameter space can the lambda '' couplings enhance A(FB)(t) to within the 2 sigma region while the lambda' couplings just produce negative contributions to worsen the fit.
学科主题	Physics
URL标识	查看原文
WOS记录号	WOS:000274002800027
公开日期	2012-08-02
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/5187]
专题	理论物理研究所_理论物理所1978-2010年知识产出
通讯作者	Cao, JJ , Henan Normal Univ, Coll Phys & Informat Engn, Xinxiang 453007, Peoples R China
推荐引用方式 GB/T 7714	Cao, JJ , Henan Normal Univ, Coll Phys & Informat Engn, Xinxiang 453007, Peoples R China,Cao, Junjie,Heng, Zhaoxia,et al. Top quark forward-backward asymmetry at the Tevatron: A comparative study in different new physics models[J]. PHYSICAL REVIEW D,2010,81(1):-.
APA	Cao, JJ , Henan Normal Univ, Coll Phys & Informat Engn, Xinxiang 453007, Peoples R China,Cao, Junjie,Heng, Zhaoxia,Wu, Lei,&Yang, Jin Min.(2010).Top quark forward-backward asymmetry at the Tevatron: A comparative study in different new physics models.PHYSICAL REVIEW D,81(1),-.
MLA	Cao, JJ , Henan Normal Univ, Coll Phys & Informat Engn, Xinxiang 453007, Peoples R China,et al."Top quark forward-backward asymmetry at the Tevatron: A comparative study in different new physics models".PHYSICAL REVIEW D 81.1(2010):-.

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