The fermion-loop scheme for finite-width effects in e^+ e^- annihilation into four fermions

Details The fermion-loop scheme for finite-width effects in e^+ e^- annihilation into four fermions The fermion-loop scheme for finite-width effects in e^+ e^- annihilation into four fermions

1996-12-05

arxiv.org/abs/hep-ph/9612260v1

Nucl.Phys. B500 (1997) 255-298

Physics

High Energy Physics

High Energy Physics - Phenomenology

49 pages, LaTeX, 2 figures, uses amssymb, axodraw

Scientific paper

10.1016/S0550-3213(97)00316-7

We describe the gauge-invariant treatment of the finite-width effects of W and Z bosons in the fermion-loop scheme and its application to the six-fermion (LEP2) processes e^- e^+ -> four fermions, with massless external fermions. The fermion-loop scheme consists in including all fermionic one-loop corrections in tree-level amplitudes and resumming the self-energies. We give explicit results for the unrenormalized fermionic one-loop contributions to the gauge-boson self-energies and the triple gauge-boson vertices, and perform the renormalization in a gauge-invariant way by introducing complex pole positions and running couplings. A simple effective Born prescription is presented, which allows for a relatively straightforward implementation of the fermion-loop scheme in LEP1 and LEP2 processes. We apply this prescription to typical LEP2 processes, i.e., e^- e^+ -> \mu^- \bar{\nu}_\mu u \bar{d}, e^- e^+ -> s \bar{c} u \bar{d}, and e^- e^+ -> e^- \bar{\nu}_e u \bar{d}, and give numerical comparisons with other gauge-invariance-preserving schemes in the energy range of LEP2, NLC and beyond.

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