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Cao, Junjie; Heng, Zhaoxia; Wu, Lei; Yang, Jin Min; Cao, JJ , Henan Normal Univ, Coll Phys & Informat Engn, Xinxiang 453007, Peoples R China
Top quark forward-backward asymmetry at the Tevatron: A comparative study in different new physics models
Source PublicationPHYSICAL REVIEW D
KeywordR-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
AbstractThe 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.
2010
ISSN1550-7998
Volume81Issue:1Pages:-
Subject AreaPhysics
Indexed BySCI
Funding OrganizationNational Natural Science Foundation of China (NNSFC)[10505007, 10821504, 10725526, 10635030]; HASTIT[2009HASTIT004, 2010IRTSTHN002]; Chinese Academy of Sciences[KJCX2.YW.W10] ; National Natural Science Foundation of China (NNSFC)[10505007, 10821504, 10725526, 10635030]; HASTIT[2009HASTIT004, 2010IRTSTHN002]; Chinese Academy of Sciences[KJCX2.YW.W10] ; National Natural Science Foundation of China (NNSFC)[10505007, 10821504, 10725526, 10635030]; HASTIT[2009HASTIT004, 2010IRTSTHN002]; Chinese Academy of Sciences[KJCX2.YW.W10] ; National Natural Science Foundation of China (NNSFC)[10505007, 10821504, 10725526, 10635030]; HASTIT[2009HASTIT004, 2010IRTSTHN002]; Chinese Academy of Sciences[KJCX2.YW.W10]
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Cited Times:95[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/5187
Collection理论物理所科研产出_SCI论文
Corresponding AuthorCao, JJ , Henan Normal Univ, Coll Phys & Informat Engn, Xinxiang 453007, Peoples R China
Recommended Citation
GB/T 7714
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):-.
APA Cao, Junjie,Heng, Zhaoxia,Wu, Lei,Yang, Jin Min,&Cao, JJ , Henan Normal Univ, Coll Phys & Informat Engn, Xinxiang 453007, Peoples R China.(2010).Top quark forward-backward asymmetry at the Tevatron: A comparative study in different new physics models.PHYSICAL REVIEW D,81(1),-.
MLA Cao, Junjie,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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