Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-10-01
Phys.Rev. D48 (1993) 4255-4268
Physics
High Energy Physics
High Energy Physics - Phenomenology
33 pages (written in Texsis,11 figures and 2 tables not included) ,NYU-TH-93/04/01 (to be published in Phys. Rev. D , November
Scientific paper
10.1103/PhysRevD.48.4255
We use the S-matrix pinch technique to derive to one loop-order gauge independent $\gamma W^{+} W^{-} $ and Z $W^{+} W^{-}$ vertices in the context of the Standard Model,with all three incoming momenta off-shell. We show that the $\gamma W^{+} W^{-}$ vertex so constructed is related to the gauge-independent W self-energy,derived by Degrassi and Sirlin,by a very simple QED-like Ward identity.The same results are obtained by the pinch technique applied directly to the process $e^{+}e^{-} \rightarrow W^{+}W^{-}$. Explicit calculations give rise to expressions for the static properties of the W gauge bosons like magnetic dipole and electric quadruple moments which being gauge independent satisfy such crucial properties as infrared finiteness and perturbative unitarity.
Papavassiliou Joannis
Philippides Kostas
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