Counterterm delta L=-1/2M sup 2 A/sub mu / sup 2 in the Langrangian of Euclidian Quantum Electrodynamics and the Qauge Invariance

摘要

The quadratic divergence of the inverse photon propagator in QED comples one to introduce the counterterm delta zeta=-1/2 A/sub mu / sup 2 M sup 2 into the Lagrangian. The work contains a simple proof that such an introduction does not break the gauge invariance of Euclidean QED. The gauge non-invariant part of zeta describes some non-interacting particle. The Feynman path integral formulation of QED is used. 4 references. (ERA citation 12:034127)