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曹俊杰

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期刊论文

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

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Phys. Rev. D,2010,81(1):014016 | 2010年01月20日 | https://doi.org/10.1103/PhysRevD.81.014016

URL:https://journals.aps.org/prd/abstract/10.1103/PhysRevD.81.014016

摘要/描述

The top quark forward-backward asymmetry AtFB measured at the Tevatron is above the standard model prediction by more than 2σ deviation, which might be a harbinger for new physics. In this work we examine the contribution to AtFB in two different new physics models: one is the minimal supersymmetric model without R parity which contributes to AtFB via sparticle-mediated t channel process d¯d→t¯t; the other is the third-generation enhanced left-right model which contributes to AtFB via Z′-mediated t channel or s channel processes. We find that in the parameter space allowed by the t¯t production rate and the t¯t invariant mass distribution at the Tevatron, the left-right model can enhance AtFB to within the 2σ region of the Tevatron data for the major part of the parameter space, and in optimal case AtFB can reach 12% which is slightly below the 1σ lower bound. For the minimal supersymmetric model without R parity, only in a narrow part of the parameter space can the λ'' couplings enhance AtFB to within the 2σ region while the λ′ couplings just produce negative contributions to worsen the fit.

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