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arXiv 2203.14980hep-phhep-exnucl-th
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共线滴中的纯夸克和胶子观测量

Pure Quark and Gluon Observables in Collinear Drop

Iain W. Stewart, Xiaojun Yao

摘要:

利用共线滴疏导技术构造了一类纯夸克和胶子观测量。该结构是基于共线液滴中射流质量的多重累积分布的线性组合,其比重是完全摄动预测的。这就产生了在相空间的一个很宽的区域中纯粹从夸克(或纯粹从胶子)获得它们的值的可观测量。我们证明了这一点,表明这些观测量是有效的两个相空间区域,一个占主导地位的微扰remation和一个占主导地位的非微扰效应。非微扰效应包括使用形状函数,只出现作为一个共同的因素,在线性组合构造。我们测试这种结构使用的数值分析与下一个领先的对数重算和各种形状函数模型,以及分析这些可观的Pythia和Vincia。共线液滴参数的选择进行了优化实验使用。

英文摘要:

We construct a class of pure quark and gluon observables by using the collinear drop grooming technique. The construction is based on linear combinations of multiple cumulative distributions of the jet mass in collinear drop, whose specific weights are fully predicted perturbatively. This yields observables which obtain their values purely from quarks (or purely from gluons) in a wide region of phase space. We demonstrate this by showing that these observables are effective in two phase space regions, one dominated by perturbative resummation and one dominated by nonperturbative effects. The nonperturbative effects are included using shape functions which only appear as a common factor in the linear combinations constructed. We test this construction using a numerical analysis with next-to-leading logarithmic resummation and various shape function models, as well as analyzing these observables with Pythia and Vincia. Choices for the collinear drop parameters are optimized for experimental use.

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