Tevatron上的百分比级精确物理学：第一次真正的NNLO QCD修正到q qbar -> t tbar + X
Percent level precision physics at the Tevatron: first genuine NNLO QCD corrections to q qbar -> t tbar + X
摘要：
我们计算了Tevatron中主导顶对产生的部分子反应的次-次-主导阶（NNLO）QCD修正。这是有史以来第一次在强子对撞机上对具有两个以上有色部分子和/或大质量费米子的可观测的NNLO计算。通过次-次-领先对数（NNLL）精度，用软胶子重算增强我们的固定阶计算，我们观察到预测的总包含截面表现出非常小的微扰不确定性，估计为+-2.7%。我们预计，一旦所有的次主导部分子反应都被考虑在内，并且这个方向的工作正在进行中，这个可观察到的微扰理论不确定性可能会下降到+-2%以下。我们的计算证明了我们的计算方法的力量，并证明它可以成功地应用于强子对撞机的所有过程，需要高精度的分析。
英文摘要：
We compute the Next-to-Next-to-Leading Order (NNLO) QCD corrections to the partonic reaction that dominates top-pair production at the Tevatron. This is the first ever NNLO calculation of an observable with more than two colored partons, and/or massive fermions, at hadron colliders. Augmenting our fixed order calculation with soft-gluon resummation through Next-to-Next-to-Leading Logarithmic (NNLL) accuracy, we observe that the predicted total inclusive cross-section exhibits a very small perturbative uncertainty, estimated at +-2.7%. We expect that once all sub-dominant partonic reactions are accounted for, and work in this direction is ongoing, the perturbative theoretical uncertainty for this observable could drop below +-2%. Our calculation demonstrates the power of our computational approach and proves it can be successfully applied to all processes at hadron colliders for which high-precision analyses are needed.
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