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Abstract / Description of output
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.
Original language | English |
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Article number | 207 |
Pages (from-to) | 1-31 |
Number of pages | 31 |
Journal | Journal of High Energy Physics |
Volume | 2021 |
Issue number | 12 |
DOIs | |
Publication status | Published - 28 Dec 2021 |
Keywords / Materials (for Non-textual outputs)
- hep-th
- hep-ph
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