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Top quark forward-backward asymmetry at the Tevatron: A comparative study in different new physics models

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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.
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Journal:PHYSICAL REVIEW D
Recommended references: Cao, Junjie,Heng, Zhaoxia,Wu, Lei,Yang, Jin Min.(2016).Top quark forward-backward asymmetry at the Tevatron: A comparative study in different new physics models.PHYSICAL REVIEW D.[ChinaXiv:201605.01757] (Click&Copy)
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[V1] 2016-05-15 17:35:17 chinaXiv:201605.01757V1 Download
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