玻恩近似之外的矩阵元法的扩展：次领先阶精度下事件权的计算
Extending the Matrix Element Method beyond the Born approximation: Calculating event weights at next-to-leading order accuracy
摘要：
在这篇文章中，我们说明如何喷流事件的事件权重可以有效地计算在次领先阶（NLO）的QCD精度。这是矩阵元法在非线性光学中应用的一个重要前提。我们修改的重组过程中使用的喷气算法，允许分解的相空间的真正的修正到解决和未解决的地区。使用适当的红外调节器，后者可以进行数值积分。作为说明，我们再现了两个样本过程的微分分布在NLO。作为进一步的应用和概念证明，我们将非线性光学精度下的矩阵元方法应用于e+e-湮没产生的顶夸克的质量测定。这一分析与未来的直线对撞机有关。我们观察到一个显着的转变，在提取的质量取决于矩阵元素法是否用于领先或下一个领先的顺序。
英文摘要：
In this article we illustrate how event weights for jet events can be calculated efficiently at next-to-leading order (NLO) accuracy in QCD. This is a crucial prerequisite for the application of the Matrix Element Method in NLO. We modify the recombination procedure used in jet algorithms, to allow a factorisation of the phase space for the real corrections into resolved and unresolved regions. Using an appropriate infrared regulator the latter can be integrated numerically. As illustration, we reproduce differential distributions at NLO for two sample processes. As further application and proof of concept, we apply the Matrix Element Method in NLO accuracy to the mass determination of top quarks produced in e+e- annihilation. This analysis is relevant for a future Linear Collider. We observe a significant shift in the extracted mass depending on whether the Matrix Element Method is used in leading or next-to-leading order.
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