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arXiv 2001.10553hep-thhep-ph
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从规范不变性和红外线谱研究背景振幅的解析结构

The analytic structure of amplitudes on backgrounds from gauge invariance and the infra-red

Anton Ilderton, Alexander J. MacLeod

摘要:

在某些理论中,规范不变性和软极限足以确定散射振幅的解析结构。这就引出了一个问题,即规范不变性在更一般的理论中是如何与解析结构联系起来的。在这里,我们集中在背景平面波的QED。我们表明,施加规范不变性引入新的虚拟极点到内部动量上的振幅分解成一系列的条款。每个术语是规范不变的,有不同的分析结构的外部动量,并表现出硬/软因式分解。所引入的极点是由红外线的行为,这使我们能够扩展我们的结果标量汤川理论。背景处理非扰动贯穿始终。

英文摘要:

Gauge invariance and soft limits can be enough to determine the analytic structure of scattering amplitudes in certain theories. This prompts the question of how gauge invariance is connected to analytic structure in more general theories. Here we focus on QED in background plane waves. We show that imposing gauge invariance introduces new virtuality poles into internal momenta on which amplitudes factorise into a series of terms. Each term is gauge invariant, has a different analytic structure in external momenta, and exhibits a hard/soft factorisation. The introduced poles are dictated by infra-red behaviour, which allows us to extend our results to scalar Yukawa theory. The background is treated non-perturbatively throughout.

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