The Pinch Technique Approach to the Physics of Unstable Particles

Abstract

The consistent description of unstable particles within the framework of perturbative gauge field theories necessitates the definition and resummation of off-shell Green's functions, which must respect several crucial physical requirements. We present the solution to this problem at one-loop, using the pinch technique.

Comments: 11 pages, uses revtex, 7 Figures in separate ps file, contribution to the 1998 Corfu Summer Institute on Elementary Particle Physics (JHEP proceedings)