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arXiv 1506.04037hep-ph
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夸克-反夸克通道中NNLO的顶夸克对产生

Top quark pair production at NNLO in the quark-antiquark channel

Gabriel Abelof, Aude Gehrmann-De Ridder, Imre Majer

摘要:

本文推导了夸克-反夸克通道中非线性光学两部分子末态对顶对产生的贡献与主导色因子$N_c^2$成正比。再加上以前发表的三部分子和四部分子NNLO贡献,这使我们能够完成唯象上最重要的NNLO修正顶对强子产生在这个通道。我们推导出这两个部分子的贡献,使用大量的扩展NNLO天线减法形式主义,并实现这些修正的部分子级事件发生器提供完整的运动学信息的所有最终状态粒子。此外,我们还导出了与$N_h$成正比的重夸克贡献。结合新的主导色和重夸克的贡献,以及轻夸克的贡献,我们提出了NNLO微分分布的大型强子对撞机和Tevatron。我们还计算了Tevatron上的微分顶夸克前后不对称性,发现我们的结果与D 0合作的测量结果符合得很好。

英文摘要:

We present the derivation of the NNLO two-parton final state contributions to top pair production in the quark-antiquark channel proportionnal to the leading colour factor $N_c^2$. Together with the three and four-parton NNLO contributions presented in a previous publication, this enables us to complete the phenomenologically most important NNLO corrections to top pair hadro-production in this channel. We derive this two-parton contribution using the massive extension of the NNLO antenna subtraction formalism and implement those corrections in a parton-level event generator providing full kinematical information on all final state particles. In addition, we also derive the heavy quark contributions proportional to $N_h$. Combining the new leading-colour and heavy quark contributions together with the light quark contributions derived previously, we present NNLO differential distributions for LHC and Tevatron. We also compute the differential top quark forward-backward asymmetry at Tevatron and find that our results are in good agreement with the measurements by the D0 collaboration.

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