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题名: Top quark forward-backward asymmetry at the Tevatron: A comparative study in different new physics models
作者: Cao, Junjie ;  Heng, Zhaoxia ;  Wu, Lei ;  Yang, Jin Min
刊名: PHYSICAL REVIEW D
出版日期: 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
学科分类: Physics
通讯作者: Cao, JJ , Henan Normal Univ, Coll Phys & Informat Engn, Xinxiang 453007, Peoples R China
部门归属: [Cao, JJ; Wu, L] Henan Normal Univ, Coll Phys & Informat Engn, Xinxiang 453007, Peoples R China; [Heng, ZX; Yang, JM] Acad Sinica, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China
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.
资助者: National Natural Science Foundation of China (NNSFC)[10505007, 10821504, 10725526, 10635030]; HASTIT[2009HASTIT004, 2010IRTSTHN002]; Chinese Academy of Sciences[KJCX2.YW.W10]
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000274002800027
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5187
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Cao, Junjie,Heng, Zhaoxia,Wu, Lei,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):-.
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