Unstable Particles and Gauge Invariance

Details Unstable Particles and Gauge Invariance Unstable Particles and Gauge Invariance

1993-11-04

arxiv.org/abs/hep-ph/9311223v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 2 figures appended, needs axodraw,epsf. The whole ps file is available with anonymous ftp from pss058.psi.ch in /pub/

Scientific paper

When computing the properties of reactions involving unstable charged particles care has to be taken to use a gauge invariant amplitude. In this talk we present methods to (automatically) obtain such an amplitude, both at the tree level and in one-loop calculations, using only a minimal number of diagrams. The numerical difference with gauge variant methods commonly used will be discussed for the case of tree level W pair production.

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