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

Abstract

In this article, general properties of impact factors involved in jet-like QED processes are explored. In particular, a general link is established between their helicity properties and their order of magnitude as defined by jet-like kinematics. Exact results are given for some processes in the strict forward direction and a general method is proposed to track orders in the calculation of multi-bremsstrahlung processes.

Comments: 46 pages