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Universal structure of radiative QED amplitudes at one loop

Engel, T. ; Signer, A. ; Ulrich, Y.

The journal of high energy physics, 2022-04, Vol.2022 (4), p.97-29, Article 97 [Periódico revisado por pares]

Berlin/Heidelberg: Springer Berlin Heidelberg

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Título:
Universal structure of radiative QED amplitudes at one loop
Autor: Engel, T. ; Signer, A. ; Ulrich, Y.
Assuntos: Amplitudes ; Approximation ; Classical and Quantum Gravitation ; Conventions ; Effective Field Theories ; Elementary Particles ; Fermions ; High energy physics ; Numerical stability ; Physics ; Physics and Astronomy ; Precision QED ; Quantum Field Theories ; Quantum Field Theory ; Quantum Physics ; Regular Article - Theoretical Physics ; Relativity Theory ; Scattering Amplitudes ; String Theory
É parte de: The journal of high energy physics, 2022-04, Vol.2022 (4), p.97-29, Article 97
Descrição: A bstract We present two novel results about the universal structure of radiative QED amplitudes in the soft and in the collinear limit. On the one hand, we extend the well-known Low-Burnett-Kroll theorem to the one-loop level and give the explicit relation between the radiative and non-radiative amplitude at subleading power in the soft limit. On the other hand, we consider a factorisation formula at leading power in the limit where the emitted photon becomes collinear to a light fermion and provide the corresponding one-loop splitting function. In addition to being interesting in their own right these findings are particularly relevant in the context of fully-differential higher-order QED calculations. One of the main challenges in this regard is the numerical stability of radiative contributions in the soft and collinear regions. The results presented here allow for a stabilisation of realvirtual amplitudes in these delicate phase-space regions by switching to the corresponding approximation without the need of explicit computations.
Editor: Berlin/Heidelberg: Springer Berlin Heidelberg
Idioma: Inglês

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Universal structure of radiative QED amplitudes at one loop

Engel, T. ; Signer, A. ; Ulrich, Y.

Berlin/Heidelberg: Springer Berlin Heidelberg

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