Gauge Invariance in Boson Production

Details Gauge Invariance in Boson Production Gauge Invariance in Boson Production

1997-06-20

arxiv.org/abs/hep-ph/9706431v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages LaTeX. Uses axodraw.sty and procsla.sty. Talk presented at The Higgs Puzzle --- What can we learn from LEP II, LHC, NL

Scientific paper

It is shown how to construct exactly gauge-invariant S-matrix elements for processes involving unstable gauge particles such as the $W$ and $Z^0$ bosons. 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. The problem of maintaining QED gauge-invariance in the process $e^+e^-\to\bar\nu_e e^-W^+\to\bar\nu_e e^-u\bar d$ is examined.

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