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arXiv 1807.04767hep-ph
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Top tagging:一种分析视角

Top tagging : an analytical perspective

Mrinal Dasgupta, Marco Guzzi, Jacob Rawling, Gregory Soyez

摘要:

本文从QCD的第一性原理出发,研究了top标记的几个方面。我们发现,被称为CMS顶部标记器的方法在高$p_t$下变得共线不安全,并提出其变体,其是IRC安全的,因此适合于分析研究,同时给出与CMS标记器相当的性能。我们还开发了新的技术,以确定三叉射流子结构,Y-分裂器的方法,并结合疏导的适应性。一个新的功能,我们的研究,相对于以前的计算的两个分支的子结构,是我们使用的三重共线分裂函数,这是由于存在两个质量尺度相同的顺序,$m_t$和$m_W$,在信号射流。我们进行了领先的对数cummed计算的各种顶标签,为背景和信号射流,并比较结果从部分子阵雨。我们还确定和评论的主要功能驱动标签性能高$p_t$,并讨论了非微扰效应的作用。

英文摘要:

In this paper we study aspects of top tagging from first principles of QCD. We find that the method known as the CMS top tagger becomes collinear unsafe at high $p_t$ and propose variants thereof which are IRC safe, and hence suitable for analytical studies, while giving a comparable performance to the CMS tagger. We also develop new techniques to identify three-pronged jet substructure, based on adaptations of the Y-splitter method and its combination with grooming. A novel feature of our studies, relative to previous calculations of two-pronged substructure, is our use of triple-collinear splitting functions, which owes to the presence of two mass scales of the same order, $m_t$ and $m_W$, in the signal jet. We carry out leading logarithmic resummed calculations for the various top-taggers, for both background and signal jets, and compare the results to those from parton showers. We also identify and comment on the main features driving tagger performance at high $p_t$ and discuss the role of non-perturbative effects.

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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