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arXiv 1708.04516hep-ph
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窄喷流加宽中的非全局和快度计算

Non-global and rapidity logarithms in narrow jet broadening

Thomas Becher, Rudi Rahn, Ding Yu Shao

摘要:

我们推导出一个全阶因式分解定理的窄喷流加宽事件的形状,在喷流事件的横向动量的措施。这是一个非全球性的可观测的接收与软和共线辐射之间的大快度差异,这也是敏感的软反冲效应相关的grammically增强的贡献。我们的工作是第一次因式分解分析的这种类型的观察,我们表明,关于非全球性的性质,快度矩阵不构成一个重要的复杂性,因为它们可以绑定到喷气功能,这是相同的全球性的观察。因此,在窄喷流加宽的领先的非全球性的EQUIPRM编码在半球软功能和轻喷流质量相关的相同的整体因素。

英文摘要:

We derive an all-order factorization theorem for the narrow jet broadening event shape, a measure of the transverse momentum in jet events. This is a non-global observable which receives logarithmically enhanced contributions associated with the large rapidity difference between soft and collinear radiation and which is also sensitive to soft recoil effects. Our work is the first factorization analysis of an observable of this type and we show that with regard to the non-global nature, the rapidity logarithms do not constitute an essential complication since they can be tied to the jet function, which is the same as for global observables. As a consequence, the leading non-global logarithms in narrow jet broadening are encoded in the same overall factor relevant for the hemisphere soft function and light jet mass.

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