Non-conserved currents and gauge-restoring schemes in single W production

Details Non-conserved currents and gauge-restoring schemes in single W production Non-conserved currents and gauge-restoring schemes in single W production

1999-11-25

arxiv.org/abs/hep-ph/9911489v1

Phys.Lett. B479 (2000) 209-217

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 3 figs

Scientific paper

10.1016/S0370-2693(00)00330-0

We generalize the inclusion of the imaginary parts of the fermionic one-loop corrections for processes with unstable vector bosons to the case of massive external fermions and non conservation of weak currents. We study the effect of initial and final state fermion masses in single W production in connection with the gauge-invariant treatment of the finite-width effects of W and Z bosons, giving numerical comparisons of different gauge-invariance-preserving schemes in the energy range of LEP2 and LC for e+e- -> e- v u d. We do not find significant differences between the results obtained in the imaginary part fermion loop scheme and in other exactly gauge preserving methods.

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