Exact cross section formulae for quantum electrodynamical processes are derived in terms of an infrared regulating measure, which explicitly segregates the real infrared divergence. It also yields a simple prescription for the removal of the virtual infrared divergence, which we discuss in the context of two different regularization schemes: the traditional photon-mass regularization and the recently developed dimensional regularization. Comparison with the coherent state formulation of quantum electrodynamics establishes the equivalence of the two approaches at the cross-section level.
ASJC Scopus subject areas
- Nuclear and High Energy Physics