Abstract
We investigated the effect of the light fermion masses on cross sections for e + e − → 4 fermions in the fermion loop scheme defined by W. Beenakker et al. [NIKHEF-96-031 (1996), hep/ph-9612260], and approximations to it. The effects are found to be very small, except of course in the collinear region of single W boson production where the electron mass acts as the cut-off.
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