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arXiv 2008.01736hep-ph
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次领先幂下QED振幅的全阶因式分解

Towards all-order factorization of QED amplitudes at next-to-leading power

E. Laenen, J. Sinninghe Damsté, L. Vernazza, W. Waalewijn, L. Zoppi

摘要:

我们概括的阿贝尔规范理论振幅的因式分解,以下一个领先的权力(NLP)在软标度扩展,最近概括汤川理论。从一个领导和下一个领导地区的全阶功率计数分析,我们推断的参数小和零费米子质量的因式分解结构。这需要引入新的通用喷流函数,非辐射和单辐射QED振幅,我们计算在一个循环的顺序。我们表明,我们的因式分解公式再现相关地区的一个和两个循环散射振幅,适当地解决端点分歧。它提供了一个虚拟共线模式的描述,并占非平凡的硬共线的相互作用,目前超出了一个循环的水平,使这是一个完整的全阶因式分解框架规范理论振幅在NLP的第一步。

英文摘要:

We generalise the factorization of abelian gauge theory amplitudes to next-to-leading power (NLP) in a soft scale expansion, following a recent generalisation for Yukawa theory. From an all-order power counting analysis of leading and next-to-leading regions, we infer the factorized structure for both a parametrically small and zero fermion mass. This requires the introduction of new universal jet functions, for non-radiative and single-radiative QED amplitudes, which we compute at one-loop order. We show that our factorization formula reproduces the relevant regions in one- and two-loop scattering amplitudes, appropriately addressing endpoint divergences. It provides a description of virtual collinear modes and accounts for non-trivial hard-collinear interplay present beyond the one-loop level, making this a first step towards a complete all-order factorization framework for gauge-theory amplitudes at NLP.

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