Stable Calculations for Unstable Particles: Restoring Gauge Invariance

Details Stable Calculations for Unstable Particles: Restoring Gauge Invariance Stable Calculations for Unstable Particles: Restoring Gauge Invariance

1995-07-04

arxiv.org/abs/hep-ph/9507216v2

Phys.Lett. B358 (1995) 339-346

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages LaTeX inc 1 figure, uses epsf, axodraw. The ps file is available as ftp://rulgm4.leidenuniv.nl/pub/preprints/stable.p

Scientific paper

10.1016/0370-2693(95)01002-8

We discuss theoretical and phenomenological aspects of the use of boson propagators with energy-dependent widths in predictions for high-energy scattering processes. In general, gauge invariance is violated in such calculations. We discuss several approaches to restore gauge invariance, necessary for a reliable result. The most promising method is the addition of the relevant parts of the fermionic corrections, which fulfills all Ward identities. The numerical difference between this and other approaches is studied. A number of recommendations are given for LEP2 computations.

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