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In this article, general properties of impact factors involved in jet-likeQED processes are explored. In particular, a general link is establishedbetween their helicity properties and their order of magnitude as defined byjet-like kinematics. Exact results are given for some processes in the strictforward direction and a general method is proposed to track orders in thecalculation of multi-bremsstrahlung processes.

Jet-like QED processes : on general properties of impact factors