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arXiv 2103.12850hep-thhep-ph
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自对偶背景上2点振幅的单圈多重共线极限

One-loop multicollinear limits from 2-point amplitudes on self-dual backgrounds

Tim Adamo, Anton Ilderton, Alexander J. MacLeod

摘要:

对于强背景场中的散射振幅,至少在原则上,可以扰动地扩展背景以获得更高点的真空振幅。在自对偶平面波背景下,我们考虑了纯Yang-Mills、QED和QCD中两点单圈振幅的这种展开。这使我们能够获得1圈真空振幅的多重共线极限;由此产生的螺旋度配置令人惊讶地受到限制,只有全加螺旋度振幅幸存下来。这些结果被证明是一致的,与众所周知的真空振幅。我们还表明,无论是阿贝尔和非阿贝尔超对称规范理论,有没有螺旋翻转(因此没有真空双折射)的任何平面波背景下,推广了以前已知的结果在欧拉-海森堡极限的super-QED。

英文摘要:

For scattering amplitudes in strong background fields, it is -- at least in principle -- possible to perturbatively expand the background to obtain higher-point vacuum amplitudes. In the case of self-dual plane wave backgrounds we consider this expansion for two-point, one-loop amplitudes in pure Yang-Mills, QED and QCD. This enables us to obtain multicollinear limits of 1-loop vacuum amplitudes; the resulting helicity configurations are surprisingly restricted, with only the all-plus helicity amplitude surviving. These results are shown to be consistent with well-known vacuum amplitudes. We also show that for both abelian and non-abelian supersymmetric gauge theories, there is no helicity flip (and hence no vacuum birefringence) on any plane wave background, generalising a result previously known in the Euler-Heisenberg limit of super-QED.

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