论文标题
NNLO的顶级Quark Pair Popoduduct：MSBAR质量的差异预测
Top-quark pair hadroproduction at NNLO: differential predictions with the MSbar mass
论文作者
论文摘要
我们考虑在MSBAR方案中以LHC的最高质量生产，以实现Top-Qark质量的重量量质量化，并且我们在QCD中介绍了近代到接头的总横截面（NNLO）的总横截面的预测。我们的最新计算将可用的差分结果扩展到扰动扩展中的一个顺序，并且与对顶级质量的精确确定相关，包括MSBAR方案中运行质量的可能影响。我们考虑评估顶部夸克的MSBAR质量的尺度的变化，将通常的7分扩展到15分尺度的变化。这种额外的差异对于理论上不确定性的可靠估计至关重要，尤其是在低扰动订单和接近Top-Quark对的生产阈值时。我们还首次通过使用运行质量来评估顶级对的不变质量分布，并以动态量表进行评估。将我们对MSBAR方案中不变质量分布的预测与CMS协作进行的最新测量进行了比较。我们观察到，包含NNLO校正可以改善与数据的一致性，并且由于顶级夸克的MSBAR质量的QCD运行而引起的效果。
We consider top-quark pair production at the LHC within the MSbar scheme for the renormalisation of the top-quark mass, and we present predictions for total and differential cross sections at next-to-next-to-leading order (NNLO) in QCD. Our state-of-the-art calculation extends the available differential results by one order in the perturbative expansion, and it is relevant for a precise determination of the top-quark mass, including possible effects of the running mass in the MSbar scheme. We consider variations of the scale at which the MSbar mass of the top quark is evaluated, extending the usual 7-point to a 15-point scale variation. This additional variation is crucial for a reliable estimate of the theoretical uncertainties, especially at low perturbative orders and close to the production threshold of the top-quark pair. We also compute, for the first time, the invariant-mass distribution of the top-quark pair by using a running mass, evaluated at a dynamic scale. Our predictions for the invariant-mass distribution in the MSbar scheme are compared with a recent measurement performed by the CMS Collaboration. We observe that the inclusion of the NNLO corrections improves the agreement with the data, and we discuss effects due to the QCD running of the MSbar mass of the top quark.
