Groomed jet mass as a direct probe of collinear parton dynamics
Groomed jet mass as a direct probe of collinear parton dynamics
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DOI：
10.1140/epjc/s10052-020-8411-y
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发表时间：
2020-07
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影响因子：
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通讯作者：
D. Anderle;M. Dasgupta;B. K. El-Menoufi;M. Guzzi;J. Helliwell
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文献类型：
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作者：
D. Anderle;M. Dasgupta;B. K. El-Menoufi;M. Guzzi;J. Helliwell
我们研究了共线极限下的部子动力学与修正质量降标记器修饰射流质量分布的对数增强项之间的联系。而前导对数（LL）结果与前导阶分裂核的共线演化有关，这里我们直接从三共线分裂核中推导出NLL结构。我们给出的计算是三共线极限下的定阶计算，与恢复成分和方法无关。因此，它构成了对以前使用SCET形式体系得出的NLL结果的有力交叉检查，并提供了在传统QCD方法中恢复所需的许多见解。
We study the link between parton dynamics in the collinear limit and the logarithmically enhanced terms of the groomed jet mass distribution, for jets groomed with the modified mass-drop tagger (mMDT). While the leading-logarithmic (LL) result is linked to collinear evolution with leading-order splitting kernels, here we derive the NLL structure directly from triple-collinear splitting kernels. The calculation we present is a fixed-order calculation in the triple-collinear limit, independent of resummation ingredients and methods. It therefore constitutes a powerful cross-check of the NLL results previously derived using the SCET formalism and provides much of the insight needed for resummation within the traditional QCD approach.