标题： 下一阶精度的矩阵元方法 显示英文标题

标题： The Matrix Element Method at next-to-leading order accuracy

摘要： 矩阵元方法（MEM）已被证明有助于充分利用实验数据中的信息。 然而，到目前为止，它主要仅在Born近似下使用。 在本文中，我们讨论了向NLO精度的扩展。 作为前提，我们提出了一种有效的方法来计算NLO精度下的事件权重。 作为示例和概念验证，我们将该方法应用于电子正负湮灭中顶夸克质量的提取。 当我们从LO转移到NLO时，观察到显著差异，这可能对依赖MEM的强子对撞机上顶夸克质量测量的解释具有相关性。 显示英文摘要

摘要： The Matrix Element Method (MEM) has proven beneficial to make maximal use of the information available in experimental data. However, so far it has mostly been used in Born approximation only. In this paper we discuss an extension to NLO accuracy. As a prerequisite we present an efficient method to calculate event weights for jet events at NLO accuracy. As illustration and proof of concept we apply the method to the extraction of the top-quark mass in e+e- annihilation. We observe significant differences when moving from LO to NLO which may be relevant for the interpretation of top-quark mass measurements at hadron colliders relying on the MEM.