Light Fermion Mass Effects in e^+e^- -> 4 Fermions

Abstract

We investigated the effect of the light fermion masses on cross sections for e^+e^- into 4 fermions in the Fermion Loop scheme defined in 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.

Comments: 8 pages, latex, 3 ps figs included