Gauge Invariance and the Unstable Particle

Details Gauge Invariance and the Unstable Particle Gauge Invariance and the Unstable Particle

1997-06-30

arxiv.org/abs/hep-ph/9706550v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages LaTeX. Uses aipproc.sty and epsfig.sty. Talk presented at 1st Latin American Symposium on High-energy Physics, SILAFAE

Scientific paper

10.1063/1.53257

It is shown how to construct exactly gauge-invariant S-matrix elements for
processes involving unstable gauge particles such as the $Z^0$ boson. The
results are applied to derive a physically meaningful expression for the
cross-section $\sigma(e^+e^-\to Z^0Z^0)$ and thereby provide a solution to the
long-standing problem of the unstable particle.

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