Regularization of QED by a generalized 't Hooft and Veltman method

Abstract

Generalizing the 't Hooft and Veltman method of unitary regulators, we demonstrate for the first time the existence of local, Lorentz-invariant, physically motivated Lagrangians of quantum-electrodynamic phenomena such that: (i) Feynman diagrams are finite and equal the diagrams of QED but with regularized propagators. (ii) N-point Green functions are causal. (iii) S-matrix relates only electrons, positrons and photons, is unitary and Lorentz-invariant, and conserves charge and total four-momentum.

RevTeX, 5 pages, nofigures; changed title and changed and added few sentences to stress that this is an example, and to shortly explain the framework of the original 't Hooft and Veltman regularization method