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arXiv 2402.12893hep-ph
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ttW过程中顶夸克衰变的矩阵元修正

Matrix Element Corrections in top quark decays for the ttW process

Rikkert Frederix, Leif Gellersen, Jasmina Nasufi

AI总结:

本文提出在Pythia8中无双重计数地启用矩阵元修正的方法,并以ttW过程为例,研究了衰变MECs对2SSl和3l末态喷注观测量的影响,发现修正贡献在相空间不均匀,局部可达±6%。

摘要:

我们提出了一种方法,可以在Pythia8中启用矩阵元修正(MECs),并与MC@NLO匹配结合使用,而不会产生双重计数。MECs是一个有趣的特征,它可能有助于提高理论预测的准确性,与匹配和合并方法相辅相成。我们将我们的方法与Pythia8中的一种特定设置选择进行了直接比较,该设置可以在某些过程中消除MECs的双重计数。我们以ttW过程为例展示了结果。这一选择使我们能够研究2SSl和3l末态中衰变MECs的影响。我们发现,与喷注相关的观测量在整个相空间中不均匀地接收到这些修正。在某些区域,它们的贡献可达±6%。

英文摘要:

We present a method that allows enabling Matrix Element Corrections (MECs) in Pythia8 with MC@NLO matching, without incurring double counting. MECs are an interesting feature that may contribute to the accuracy of theoretical predictions, alongside matching and merging. We directly compare our method to a specific choice of settings in Pythia8, which can remove double-counting for MECs in certain processes. We show results by taking the ttW process as an example. This choice allows us to study the impact of decay MECs in the 2SSl and 3l final states. We find that jet-related observables receive these corrections unevenly throughout the phase space. They can contribute up to $\pm 6\% in certain regions.

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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