GAUGE INVARIANCE AND ANOMALOUS GAUGE BOSON COUPLINGS

Abstract

Using the S--matrix pinch technique we obtain to one loop order, gauge independent $\gamma W^{-}{W}^{+}$ and $Z{W}^{-}{W}^{+}$ vertices in the context of the standard model, with all incoming momenta off--shell. We show that the vertices so constructed satisfy simple QED--like Ward identities. These gauge invariant vertices give rise to expressions for the magnetic dipole and electric quadrupole form factors of the W gauge boson, which, unlike previous treatments, satisfy the crucial properties of infrared finiteness and perturbative unitarity.

Comments: Latex with all special macros included, 5 pages, no figures To appear in the Conference Proceedings for BEYOND THE STANDARD MODEL IV, Granlibakken, Lake Tahoe, Dec 13-18, 1994, hosted by Davis Institute for High Energy Physics. Talk presented By J. Papavassiliou.