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arXiv 1901.08008hep-phhep-ex
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(反)$\mathbf{k_t}$ -jet算法的NLO矩阵元方法

Matrix Element Method at NLO for (anti-)$\mathbf{k_t}$-jet algorithms

Manfred Kraus, Till Martini, Peter Uwer

摘要:

在这篇文章中,我们提出了一种方法来计算一个给定的喷流事件的(反)$k_t$算法依赖于传统的$2\to 1$重组的次领先阶(NLO)QCD精度的后验事件权重。这是一个重要的扩展相比,现有的蒙特卡罗工具,产生射流事件与相应的权重,但不允许一个计算的权重为一个给定的事件。该方法可用于产生按固定阶NLO截面分布的未加权事件。此外,该方法允许一个计算NLO准确的权重的事件记录的实验。这种能力的潜力是通过应用矩阵元方法(MEM)与Pythia结合产生的单顶夸克事件与POWHEG说明。第一次,在MEM部分子簇射效应的系统研究。该方法是完全通用的,可以适用于任何LHC过程。

英文摘要:

In this article, we present a method to calculate a posteriori event weights at next-to-leading-order (NLO) QCD accuracy for a given jet event defined by the (anti-)$k_t$ algorithm relying on the conventional $2\to 1$ recombination. This is an important extension compared to existing Monte-Carlo tools which generate jet events together with the corresponding weight but do not allow one to calculate the weight for a given event. The method can be used to generate unweighted events distributed according to the fixed-order NLO cross section. In addition, the method allows one to calculate NLO accurate weights for events recorded by experiments. The potential of this ability is illustrated by applying the Matrix Element Method (MEM) to single top-quark events generated with POWHEG in combination with Pythia. For the first time, a systematic study of parton shower effects within the MEM is provided. The method is completely general and can be applied to arbitrary LHC processes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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