Higher Order Corrections to Spin Correlations in Top Quark Pair Production at the LHC.
Higher Order Corrections to Spin Correlations in Top Quark Pair Production at the LHC.
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DOI：
10.1103/physrevlett.123.082001
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发表时间：
2019-01
影响因子：
8.6
通讯作者：
A. Behring;M. Czakon;A. Mitov;R. Poncelet;A. Papanastasiou
中科院分区：
文献类型：
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作者：
A. Behring;M. Czakon;A. Mitov;R. Poncelet;A. Papanastasiou
我们首次计算了LHC上顶夸克对产生中自旋关联的次-次-主导阶（NNLO）QCD修正。NNLO修正在描述相应的微分分布中起着重要的作用。我们观察到，标准模型计算描述了基准区域中可用的Δ ε_{ε_}数据，但与外推到全相空间的Δ ε_{ε_}测量不一致。这种差异很可能是由于现有的事件发生器和双轻子顶对末态的NNLO计算之间的精度差异。
We calculate, for the first time, the next-to-next-to-leading order (NNLO) QCD corrections to spin correlations in top quark pair production at the LHC. The NNLO corrections play an important role in the description of the corresponding differential distributions. We observe that the standard model calculation describes the available Δϕ_{ℓℓ} data in the fiducial region but does not agree with the Δϕ_{ℓℓ} measurement extrapolated to full phase space. Most likely this discrepancy is due to the difference in precision between existing event generators and NNLO calculations for dilepton top-pair final states.